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Operating Manual
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Primes LQM+ 20, LQM+ Series, LQM+ 500, LQM+ 200, LQM+ HP Operating Manual

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Operating Manual
35,0(6
Translation of the original instructions
LaserQualityMonitor LQM+
LQM+ 20, LQM+ 200/500, LQM+ HP (10/20 kW)
LaserDiagnosticsSoftware LDS
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IMPORTANT!
READ CAREFULLY BEFORE USE.
KEEP FOR FUTURE USE.
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Table of contents
1 Basic safety instructions 7
2 Symbol explanations 9
3 About this operating manual 10
4 Conditions at the installation site 10
5 Introduction 10
5.1 System description .................................................................................................................10
5.2 Measuring principle ................................................................................................................12
5.3 Short overview installation .......................................................................................................13
6 Transport 14
7 Installation 14
7.1 Preparation and installation position ........................................................................................14
7.2 Manually aligning the LaserQualityMonitor LQM+ ....................................................................15
7.2.1 Alignment tool ........................................................................................................... 15
7.2.2 Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with
7.2.3 Fine adjustment at the 1st attenuator .........................................................................16
7.3 Install the LaserQualityMonitor LQM+ ...................................................................................... 17
7.3.1 Install the LQM+ 20/200/500 without bottom plate ...................................................17
7.3.2 Install the LQM+ 200/500 with bottom plate .............................................................18
7.3.3 Install the LQM+ HP with bottom plate ...................................................................... 19
st
1
attenuator ............................................................................................................15
8 Connect cooling circuit (LQM+ HP and LQM+ 500only) 20
8.1 Water quality ...........................................................................................................................20
8.2 Water pressure ........................................................................................................................ 20
8.3 Humidity .................................................................................................................................. 21
8.4 Water connections and water flow rate ....................................................................................22
8.4.1 LQM+ HP (10 kW and 20 kW) ................................................................................... 22
8.4.2 LQM+ 500 ................................................................................................................22
8.4.3 Remove the sealing plugs of the water connections .................................................. 23
9 Electrical connection 24
9.1 Connections ............................................................................................................................ 24
9.2 Pin assignment .......................................................................................................................25
9.2.1 Power supply ........................................................................................................... 25
9.2.2 Inlet external trigger ..................................................................................................25
9.2.3 Outlet internal trigger .................................................................................................25
9.3 Safety facilities ........................................................................................................................26
9.3.1 Monitoring side access to the measuring objective and neutral-density filters ............ 26
9.3.2 Temperature control ..................................................................................................26
9.3.3 Safety interlock .........................................................................................................27
9.4 Connection to the PC and connect power supply ...................................................................28
10 Status display 29
11 Measurement 30
11.1 Safety instructions ................................................................................................................... 30
11.2 Selection and change of the measuring objective and the neutral density filter ........................31
11.2.1 Selection of the measuring objective .........................................................................31
11.2.2 Exchanging the measuring objective or the neutral density filter ................................32
11.2.3 Neutral density filter ..................................................................................................33
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11.3 Connect the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS ...................34
11.3.1 Connect device ......................................................................................................... 34
11.3.2 Change the network address of a connected device .................................................34
11.4 Set up the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS ......................35
11.4.1 Choose the beam pointing function...........................................................................35
11.4.2 Start beam search ....................................................................................................36
11.4.3 Log beam pointing stability .......................................................................................38
11.4.4 If the laser beam is not found .................................................................................... 39
11.5 Perform an automatic caustic measurement............................................................................40
11.5.1 Choose automatic caustic measurement mode ........................................................40
11.5.2 Configure settings (Device control > Settings) ........................................................41
11.5.3 Configure advanced settings (Device control > Advanced) .....................................41
11.5.4 Starting an automatic caustic measurement ..............................................................42
11.5.5 Measurement results display .....................................................................................42
11.6 Perform power measurement ..................................................................................................43
11.6.1 Choose power measurement mode ..........................................................................43
11.6.2 Configure settings (Device control) ..........................................................................44
11.6.3 Starting a power measurement .................................................................................44
11.6.4 Measurement results display .....................................................................................45
12 Troubleshooting 46
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13 Maintenance and service 47
14 Storage 47
15 Measures for the product disposal 47
16 Declaration of conformity 48
17 Technical data 49
18 Dimensions 50
18.1 LQM+ 20 ................................................................................................................................50
18.2 LQM+ 200/500 (without bottom plate) ....................................................................................51
18.3 LQM+ HP ................................................................................................................................ 52
19 Appendix 53
19.1 Changing the factory setting on the LQM+ 20/200UV .............................................................53
19.2 HighYAG collimation module up to 6 kW .................................................................................55
19.2.1 Key data for the cooling system for the HighYAG collimation module ........................56
19.2.2 Schematic of the cooling system for the HighYAG collimation module ....................... 56
19.2.3 Remove/Install the HighYAG collimation module .......................................................57
19.2.4 Choosing the measuring objective with a HighYAG collimation module installed ........ 58
19.3 IPG collimation module up to 20 kW .......................................................................................60
19.3.1 Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG
collimators ................................................................................................................61
19.3.2 The use of the measuring objectives 1:1 and 5:1 ......................................................62
19.3.3 Maximum Power ....................................................................................................... 62
19.4 Optical path in LQM+ HP (with IPG Collimator) ........................................................................ 63
20 Formula and algorithms for raw beam back calulation 64
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PRIMES - The Company
PRIMES manufactures measuring devices used to analyze laser beams. These devices are employed for the diagnostics of high-power lasers ranging from CO length range from infrared through to near UV is covered, offering a wide variety of measuring devices to determine the following beam parameters:
• Laser power
• Beam dimensions and position of an unfocused beam
• Beam dimensions and position of a focused beam
• Beam quality factor M²
PRIMES is responsible for both the development, production, and calibration of the measuring devices. This guarantees optimum quality, excellent service, and a short reaction time, providing the basis for us to meet all of our customers’ requirements quickly and reliably.
lasers and solid-state lasers to diode lasers. A wave-
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PRIMES GmbH Max-Planck-Str. 2 64319 Pfungstadt Germany
Tel +49 6157 9878-0 info@primes.de www.primes.de
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1 Basic safety instructions
Intended use
The LaserQualityMonitor LQM+ is exclusively intended for measurements which are carried out in or nearby the optical path of high power lasers. Please mind and adhere to the specifications and limit values given in chapter 17 „Technical data“ on page 49. Other forms of usage are improper. The information contained in this operating manual must be strictly observed to ensure proper use of the device.
Using the device for unspecified use is strictly prohibited by the manufacturer. By usage other than intended the device can be damaged or destroyed. This poses an increased health hazard up to fatal injuries. When operating the device, it must be ensured that there are no potential hazards to human health.
The device itself does not emit any laser radiation. During the measurement, however, the laser beam is guided onto the device which causes reflected radiation (laser class 4). That is why the applying safety regu­lations are to be observed and necessary protective measures need to be taken.
In measuring mode, the laser control’s safety interlock must be connected with the device.
Observing applicable safety regulations
Please observe valid national and international safety regulations as stipulated in ISO/CEN/TR standards as well as in the IEC-60825-1 regulation, in ANSI Z 136 “Laser Safety Standards” and ANSI Z 136.1 “Safe Use of Lasers”, published by the American National Standards Institute, and additional publications, such as the “Laser Safety Basics”, the “LIA Laser Safety Guide”, the “Guide for the Selection of Laser Eye Protection” and the “Laser Safety Bulletin”, published by the Laser Institute of America, as well as the “Guide of Control of Laser Hazards” by ACGIH.
Necessary safety measures
DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations without taking the following precautions. All precautions must be taken, even when the fiber is in the collimator or fiber adapter.
Please take the following precautions.
X
If people are present within the danger zone of visible or invisible laser radiation, for example near laser systems that are only partly covered, open beam guidance systems, or laser processing areas, the following safety measures must be implemented:
• Connect the laser control’s safety interlock to the device. Check that the safety interlock will switch off the laser properly in case of error.
• Please wear safety goggles adapted to the power, power density, laser wave length and operating mode of the laser beam source in use.
• Depending on the laser source, it may be necessary to wear suitable protective clothing or protective gloves.
• Protect yourself from direct laser radiation, scattered radiation, and beams generated from laser radiation (by using appropriate shielding walls, for example, or by weakening the radiation to a harmless level).
• Use beam guidance or beam absorber elements that do not emit any hazardous substances when they come in to contact with laser radiation and that can withstand the beam sufficiently.
• Install safety switches and/or emergency safety mechanisms that enable immediate closure of the laser shutter.
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• Ensure that the device is mounted securely to prevent any movement of the device relative to the beam axis and thus reduce the risk of scattered radiation. This in the only way to ensure optimum performance during the measurement.
Employing qualified personnel
The device may only be operated by qualified personnel. The qualified personnel must have been instructed in the installation and operation of the device and must have a basic understanding of working with high­power lasers, beam guiding systems and focusing units.
Conversions and modifications
The device must not be modified, neither constructionally nor safety-related, without our explicit permission. The device must not be opened e.g. to carry out unauthorized repairs. Modifications of any kind will result in the exclusion of our liability for resulting damages.
Liability disclaimer
The manufacturer and the distributor of the measuring devices do not claim liability for damages or injuries of any kind resulting from an improper use or handling of the devices or the associated software. Neither the manufacturer nor the distributor can be held liable by the buyer or the user for damages to people, material or financial losses due to a direct or indirect use of the measuring devices.
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2 Symbol explanations

The following symbols and signal words indicate possible residual risks:
DANGER
Means that death or serious physical injuries will occur if necessary safety precautions are not taken.
WARNING
Means that death or serious physical injuries may occur if necessary safety precautions are not taken.
CAUTION
Means that minor physical injury may occur if necessary safety precautions are not taken.
NOTICE
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Means that property damage may occur if necessary safety precautions are not taken.
The following symbols indicating requirements and possible dangers are used on the device:
Components susceptible to ESD
Read and observe the operating instructions and safety guidelines before startup!
Further symbols that are not safety-related:
Here you can find useful information and helpful tips.
With the CE designation, the manufacturer guarantees that its product meets the requirements of the relevant EC guidelines.
Call for action
X
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3 About this operating manual

This documentation describes the installation and configuration of the LaserQualityMonitor LQM+ and the execution of measurements with the LaserDiagnosticsSoftware LDS.
The LaserDiagnosticsSoftware LDS must be installed on the PC for measuring operation of the LaserQuali­tyMonitor LQM+. The basic version of the LaserDiagnosticsSoftware LDS is included in the scope of delivery for the device.
For a detailed description of the software installation, file management and evaluation of the measured data, please refer to the separate operating manual LaserDiagnosticsSoftware LDS.

4 Conditions at the installation site

• The device must not be operated in a condensing atmosphere.
• The ambient air must be free of organic gases.
• Protect the device from splashes of water and dust.
• Operate the device in closed rooms only.

5 Introduction

5.1 System description
The LaserQualityMonitor LQM+ is used to measure the beam properties of a beam source either by measur­ing the open beam across several meters or with a fiber placed in a fiber holder or collimator. Cw lasers can be measured and pulsed lasers can also be measured using an internal trigger.
The electronics and all optical components shown are installed in the LQM+ 20 basic device. The LQM+ 20 basic device can be supplemented by a front-end module with a beam splitter, an absorber and an align­ment unit, which enables the use of the device even in the multikilowatt range. Fiber retainers, collimators, neutral density filters as well as additional measuring objectives are available upon request.
The laser power can also be measured with the integrated power meters in the 1st and 2nd attenuator (only LQM+ 500 and LQM+ HP).
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Fig. 5.1: Components of the LQM+ 20 basic device
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Fig. 5.2: Components of the LQM+ 200/500
Absorber with
power meter
1st Attenuator
Alignment unit
Power meter
(LQM+ 500 only)
1st Attenuator
Alignment unit
2nd Attenuator with beam splitter
Fig. 5.3: Components of the LQM+ HP (10/20 kW)
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5.2 Measuring principle
Due to the very long measuring path of three to six Rayleigh lengths, a lot of measuring is needed to char­acterize a collimated laser beam. The LaserQualityMonitor LQM+ therefore generates a compact caustic inside the device by focusing the irradiated collimated laser beam with a focussing optic. In the process, the focused beam is weakened as it passes through an integrated prisms and OD filter and then appears on the CCD sensor, enlarged by a measuring objective.
The LaserDiagnosticsSoftware LDS software determines the radius, location, and orientation of the laser beam by moving the prisms inside the device and measuring the two-dimensional power density distribution repeatedly at various positions. The electronic integration time control of the CCD sensor expands the sys­tem’s dynamic area. As a result of this, it generally isn’t necessary to adjust the filter during a measurement.
The following laser sources can be measured:
• All cw and pulsed laser sources in the wave length area of 340 1090nm with medium power from approx. 1mW up to multikilowatt ranges with an M² ranging from 1 to approx. 50.
• The beam diameter at the aperture of the measuring system can vary in the range of 1.5mm to 15mm (22mm only for LQM+ HP 20 kW), with divergence below 10mrad.
Focusing opticLaser beam Prisms
Prisms
Trigger
Measuring objective 5:1
Position 1
(illustrated inserted)
Measuring objective 1:1
Position 2
(illustrated not inserted)
–
360nm/515
–
545nm/1030
CCD sensorOD filter
–
Absorber
Fig. 5.4: Optical assembly of the LQM+ 20 basic device
Scaning rangeRaw beam
Focusing optic Measuring objective
Fig. 5.5: Measuring Principle
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CCD sensor
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5.3 Short overview installation
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1. Installing the LaserDiagnosticsSoftware LDS on the computer
• Software is part of the scope of delivery
2. Taking safety precautions Chapter 1 on page7
3. Prepare Installation (only during open beam measurement)
• Make preparations
• Set the installation position
• Align the device manually
4. Connect the water-cooling (LQM+ HP and LQM+ 500 only)
• Connection diameter
• Observe flow rate
5. Power supply
• Connect power supply
See separate Operating Manual of the LaserDiagnos­ticsSoftware LDS
Chapter 7 on page14
Chapter 8 on page20
Chapter 9 on page24
• Connect safety interlock
6. Connection with the computer
• Via Ethernet or LAN
7. Complete Installation (only during open beam measurement)
• Align the device with the LaserDiagnosticsSoftware LDS according to chapter 11.4 on page35.
• Mount the device firmly in accordance with chapter 7 on page14
8. Measure
• Follow the safety instructions
• Select and use the measuring objective and neutral-density filter
• Check the device‘s alignment with the LaserDiagnosticsSoftware LDS
• Perform a test measurement
Chapter 9.4 on page28
Chapter 11.4 on page35
Chapter 11 on page30
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6 Transport

WARNING
Risk of injury when lifting or dropping the device
Lifting and positioning heavy devices can, for example, stress intervertebral disks and cause chronic changes to the lumbar or cervical spine. The device may fall.
Use a lifting device to lift and position the device.
X
NOTICE
Damaging/destroying the device
Optical components may be damaged if the device is subjected to hard shocks or is allowed to fall.
Handle the device carefully when transporting or installing it.
X
To avoid contamination, cover the apertures with the provided lid or optical tape.
X
Only transport the device in the original PRIMES transport box.
X
NOTICE
Damage/destruction of the device caused by leaking or freezing cooling water
Leaking cooling water can damage the device. Transporting the device at temperatures near or below freezing and without emptying the cooling circuit completely can damage the device.
Empty the lines of the cooling circuit completely.
X
Don’t use any compressed air to empty the cooling circuit.
X
Even when the lines of the cooling circuit have been emptied, a small amount of residual
X
water will remain in the device at all times. This may leak out and end up inside the device. Close the connector plug of the cooling circuit with the included sealing plug.

7 Installation

7.1 Preparation and installation position
Check the space available before mounting the device, especially the required space for the connection cables and hoses (please see chapter 18 „Dimensions“ on page 50). The device must be firmly assembled and must be mounted with screws (see chapter 7.3 on page17).
The LaserQualityMonitor LQM+ can be mounted and operated in any position. During open beam measure­ment, the LaserQualityMonitor LQM+ must be aligned with the laser beam. The steps taken for installation can be found in chapter 5.3 on page13.
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7.2 Manually aligning the LaserQualityMonitor LQM+
For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned with the alignment tool to the laser beam. The inlet aperture must be aligned centrally and at a right angle to the laser beam:
1. Align the LaserQualityMonitor LQM+ manually with a pilot laser and the alignment tool.
• The LaserQualityMonitor LQM+ is properly aligned when the pilot beam is centered through the holes in the alignment tool.
2. Check the alignment as specified in chapter 11.4 on page35 with the alignment mode of the LaserDiagnosticsSoftware LDS.
7.2.1 Alignment tool
An alignment tool is provided for the various LaserQualityMonitor versions that can be used for all aperture diameters. After inserting the alignment tool into the aperture, it is fastened to a metal half ring with magnets.
Magnets Metal half ring
Fig. 7.1: Alignment tool for aligning the LQM+ versions with various apertures
7.2.2 Manual alignment of the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator
LQM+ 20 basic device LQM+ 200/500 with 1st attenuator
Fig. 7.2: Alignment tool mounted on the LQM+ 20 basic device and the LQM+ 200/500 with 1st attenuator
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7.2.3 Fine adjustment at the 1st attenuator
With the angle with two integrated micrometer screws (see Fig. 7.3 on page16).
The laser beam can thus be aligned within the boundaries for the LaserQualityMonitor LQM+. The feedback to change the beam position through fine adjustments is issued via the LaserDiagnosticsSoftware LDS (see chapter 11.4 on page35).
1st attenuator, the angle of incidence of the laser beam can be finely adjusted to the appropriate
+
-
+
-
Fig. 7.3: Micrometer screws on the 1st attenuator module for fine adjustment (for the example of the LQM+ 500)
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7.3 Install the LaserQualityMonitor LQM+
DANGER
Serious eye or skin injury due to laser radiation
For an open beam measurement, the LaserQualityMonitor LQM+ must be aligned to the laser beam. If the device is moved from its calibrated position, increased scattered or directed reflection of the laser beam occurs during measuring operation (laser class 4).
When mounting the device, please ensure that it cannot be moved, neither due to an unin-
X
tended push or a pull on the cables and hoses.
7.3.1 Install the LQM+ 20/200/500 without bottom plate
44.3 60
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120 60
285
150
Fig. 7.4: Fastening threaded holes LQM+ 20/200/500 without bottom plate
There are four M6 mounting threads on the underside of the device for fastening it onto a holder provided by the customer. We recommend screws of the strength class 8.8.
4 threaded holes M6
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7.3.2 Install the LQM+ 200/500 with bottom plate
60
M6
120
Fig. 7.5: Fastening threaded holes LQM+ 200/500 with bottom plate
For the connection of a customer specific part, there are four threads M6 in the bottom plate. We recom­mend screws of the strength class 8.8.
4 threaded holes M6
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7.3.3 Install the LQM+ HP with bottom plate
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Fig. 7.6: Fastening bores and alignment threads LQM+ HP with bottom plate
4 mounting holes Ø 7.8mm
4 threaded holes M8 for the alignment
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8 Connect cooling circuit (LQM+ HP and LQM+ 500only)
DANGER
Fire hazard; Damage/Destruction of the device due to overheating
If there is no water cooling or a water flow rate which is insufficient, there is a danger of overheating, which can damage the device or set it on fire.
Operate the device with a connected water cooling and a sufficient water flow rate only.
X
8.1 Water quality
NOTICE
Damage/Destruction of the device due to different chemical potentials
The parts of the device which get in contact with cooling water consist of copper, brass or stainless steel. Connecting the unit to a colling curcuit containing aluminum components may cause corrosion of the aluminum due to the different chemical potentials.
Do not connect the device on a cooling circuit in which aluminum components are installed.
X
• The device can be operated with tap water as well as demineralized water.
• Do not operate the device on a cooling circuit containing additives such as anti-freeze.
• Do not operate the device on a cooling circuit in which aluminum components are installed. Especially when it comes to the operation with high powers and power densities, it may otherwise lead to corrosion in the cooling circuit. In the long term, this reduces the efficiency of the cooling circuit.
• Should the cooling fail, the device can withstand the laser radiation for a few seconds. In this case, please check the device as well as the water connections for damages.
• Large dirt particles or teflon tape may block internal cooling circuits. Therefore, please thoroughly rinse the system before connecting it.
8.2 Water pressure
Normally, 2 bar primary pressure at the entrance of the absorber are sufficient in case of an unpressurized outflow.
NOTICE
Damage/Destruction of the device due to overpressure
The maximum permissible water inlet pressure must not exceed 4bar.
X
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8.3 Humidity
• The device must not be operated in a condensing atmosphere. The humidity has to be considered in order to prevent condensates within and outside the device.
• The temperature of the cooling water must not be lower than the dew point (see Tab. 8.1 on page21).
NOTICE
Damage/Destruction of the device due to condensing water
Condensation water inside of the objective will lead to damage.
Mind the dew-point in Tab. 8.1 on page21.
X
Do only cool the device during the measuring operation. We recommend starting the cooling approx. 2min­utes before the measurement and terminating it approx. 1minute after the measurement.
40
35
30
25
20
15
10
Cooling water temperature in °C
5
0
Tab. 8.1: Dew point diagram
Example
Air temperature: 22°C Relative humidity: 60%
0 5 10 15 20 25 30 35 40
Air temperature in °C
100
80 70 60
50
40
30
20
Relative humidity in %
10
The cooling water temperature cannot fall below 14°C.
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8.4 Water connections and water flow rate
8.4.1 LQM+ HP (10 kW and 20 kW)
LQM+ HP (10 kW)
Connection diameter Recommended flow rate Minimum flow rate
PE hoses 16mm 7l/min – 8l/min (1l/(min · kW) Not lower than 4.5l/min
LQM+ HP (20 kW)
Connection diameter Recommended flow rate Minimum flow rate
PE hoses 16mm 16l/min – 20l/min (1l/(min · kW) Not lower than 14l/min
8.4.2 LQM+ 500
LQM+ 500
Connection diameter Recommended flow rate
PE hoses 6mm 1.5l/min (1l/(min · kW)
Cooling Circuit LQM+ HP
(return flow)
Cooling Circuit LQM+ HP
(inlet flow)
Cooling Circuit LQM+ 500
(return flow)
Cooling Circuit LQM+ 500
Fig. 8.1: Water connections of the LQM+ HP and the LQM+ 500
(inlet flow)
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8.4.3 Remove the sealing plugs of the water connections
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Release ring
1. Push
2. Pull
Fig. 8.2: Remove the sealing plugs of the water connections
1. Please push down the release ring of the connection and pull out the plug with your free hand.
2. Remove the sealing plugs of the water connections and keep it in a save place.
3. Close the flow line (Water In) and the return flow (Water Out) of the device, by inserting the hose as far as pos­sible (approx. 2cm deep).
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9 Electrical connection

The LaserQualityMonitor LQM+ requires a supply voltage of 24V±5% (DC) for the operation. A suitable power supply is included in the scope of delivery.
Please use only the provided PRIMES power supply and connection lines.
Please ensure that all electrical connections have been established and switch the device on before starting the LaserDiagnosticsSoftware LDS. The LaserQualityMonitor LQM+ serves as a dongle for the software on the computer in order to enable certain software functions.
9.1 Connections
On/Off switch
Mains supply
connection
Fig. 9.1: Connections
Input
external trigger
BNC
Output
internal trigger
BNC
LAN socket
Safety circuit connection
(Safety interlock)
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9.2 Pin assignment
9.2.1 Power supply
Harting M12-P-PCB-THR-2PC-5P-LCOD-M-STR (view: connector side)
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4
FE
Tab. 9.1: Connection socket for the PRIMES power supply in the connection panel
1
Pin Function
1 +24V
2 Not assigned
3 GND
4 Not assigned
5 FE (functional earth)
9.2.2 Inlet external trigger
BNC connector (view: connector side)
Pin Function
1 +5 V (Trigger signal)
1
2
Fig. 9.2: Connection socket Inlet for an external trigger in the connection panel
2 GND
9.2.3 Outlet internal trigger
BNC connector (view: connector side)
Pin Function
1 +5 V (Trigger signal)
1
2
Fig. 9.3: Connection socket Outlet for the internal trigger in the connection panel
2 GND
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9.3 Safety facilities
9.3.1 Monitoring side access to the measuring objective and neutral-density filters
A safety switch monitors the side frame plates. When the frame plate is removed, the laser will switch off if the safety interlock is connected.
DANGER
Serious eye or skin injury due to laser radiation
When the safety interlock is not connected, radiation (Laser class 4) reflected during mea­suring operation may escape from the device when the side frame plate is open.
Only operate the device with a mounted side frame plate.
X
Fig. 9.4: Device with side frame plate removed
9.3.2 Temperature control
st
and 2nd attentuators each have a temperature switch built into them that will trigger a warning mes-
The 1 sage in the LaserDiagnosticsSoftware LDS when a temperature of 75°C is exceeded. If the safety interlock is connected, the laser will be turned off.
NOTICE
Damage/Destruction of the device
Without a safety interlock connected, the device may be damaged or destroyed when sub­jected to excess temperatures.
Operate the device only with a connected safety interlock.
X
The LaserQualityMonitor LQM+ should never be left unattended while taking measurements.
X
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9.3.3 Safety interlock
st
The port for a safety interlock, which monitors the 1
and 2nd attenuator for excess temperature and whether
or not the side frame plates are opened, is integrated into the LaserQualityMonitor LQM+ 20 basic device.
DANGER
Serious eye or skin injury due to laser radiation; Damage/Destruction of the device
If the safety interlock is not connected, the safety equipment of the device will not be moni­tored.
Connect the laser control to terminals 1 to 4 so that the laser shuts off when these con-
X
nection is interrupted.
Pin assignment (view: plug side)
Safety interlock connector
2
1
8
73
Fig. 9.5: Safety interlock device plug in the connection panel
Binder M8; 86 6119 1100 00008
Pin Function
1 Safety interlock (potential free).
2 Safety interlock (potential free). Connected with pin 1 when ready for operation.
3 Safety interlock (potential free). Connected with pin 1 when not ready for operation.
4 Safety interlock (potential free).
5 Safety interlock (potential free). Connected with pin 4 when ready for operation.
6 Safety interlock (potential free). Connected with pin 4 when not ready for operation.
7
8 Safety interlock GND
Tab. 9.2: Pin assignment safety interlock
Connected with pin 2 when ready for operation. Connected with pin 3 when not ready.
Connected with pin 5 when ready for operation. Connected with pin 6 when not ready.
+24V
64
5
When connecting the safety interlock with pin 1 and pin 3 or with with pin 4 and pin 5, it has to be ensured that the laser is turned off when this connection is interrupted.
To be able to identify a connected safety interlock, pin 7 and pin 8 have to be bridged in the cable socket. If the cable socket is not connected and the safety interlock is thus not active, a warning message in the LaserDiagnosticsSoftware LDS is issued. A suitable 8-pole cable socket is part of the scope of delivery.
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9.4 Connection to the PC and connect power supply
NOTICE
Damage/Destruction of the device
When the electrical cables are disconnected during operation (when the power supply is ap­plied), voltage peaks occur which can destroy the communication components of the mea­suring device.
Please turn off the PRIMES power supply before disconnecting the cables.
X
1. Connect the device with the PC via a crossover cable or with the network via a patch cable.
2. Plug the power supply into the connector socket for the power supply.
PRIMES Power Supply
LQM+/LQM+ HP
Crossover Cable
Ethernet
PC
Fig. 9.6: Connection via Ethernet with a PC or a local network
or
Patch cable
Ethernet
LAN
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10 Status display

The status display consists of an indicator field that indicates the various states of the LaserQualityMonitor LQM+ with various colors.
Color Meaning
White The device is switched on and operational
Yellow Measuring
Red Lights up briefly while the measuring plane is being recorded.
Tab. 10.1: States of the status display
Tab. 10.2: Status display
Staying lit signals a device error. The device error is shown in the LaserDiagnosticsSoftware LDS.
Status display
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11 Measurement

11.1 Safety instructions
DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ must not be operated in any of the available configurations without taking the following precautions. All precautions must be taken, even when the fiber is in the collimator or fiber adapter.
Please wear safety goggles adapted to the power, power density, laser wave length and
X
operating mode of the laser beam source in use.
Wear suitable protective clothing and protective gloves.
X
Protect yourself from laser radiation by separating protective devices (e.g. by using appro-
X
priate shielding).
DANGER
Serious eye or skin injury due to laser radiation
If the device is moved from its calibrated position, increased scattered or directed reflection of the laser beam occurs during measuring operation (laser class 4).
When mounting the device, please ensure that it cannot be moved, neither due to an unin-
X
tended push or a pull on the cables and hoses.
DANGER
Serious eye or skin injury due to laser radiation
When the safety interlock is not connected, radiation (laser class 4) reflected during measur­ing operation may escape from the device when the side frame plate is open.
Connect the device’s safety interlock to the laser control. Check that the safety interlock will
X
turn off the laser properly in case of error.
NOTICE
Damage/Destruction of the device
Without safety interlock connected, the device may be damaged or destroyed when sub­jected to excess temperatures.
30
Connect the device’s safety interlock to the laser control. Check that the safety interlock will
X
turn off the laser properly in case of error.
The LaserQualityMonitor LQM+ should never be left unattended while taking measurements.
X
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f
rawbeam
⋅
λ
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11.2 Selection and change of the measuring objective and the neutral density filter
11.2.1 Selection of the measuring objective
The selection of the correct measuring objective is of vital importance for the measurement quality. The limi­tation of use for the 1:1 or 5:1 measuring objectives is shown in the diagram Tab. 11.1 on page31.
14
12
10
8
6
4
Beam diameter in mm
2
0
1 10
M²
Tab. 11.1: Range of application of the LQM+ objectives
Blue area 1:1 measuring objective Red area
Example
The following example explains how a measuring objective is selected based on the minimum beam diam­eter in the LaserQualityMonitor LQM+ and the number of lit pixels to be achieved depending on the measur­ing objective (MOB).
λ = 1064nm M² = 1 d
= 7.3mm
rawbeam
d
foc
5:1 measuring objective
= 37.10µm (d
foc
mm
200
d
rawbeam
mm
⋅⋅
d
=
foc
= Focus diameter of the internal caustic)
π
M
2
100
For a fill factor of 35% and a resolution of 64pixel minimum 22illuminated pixels are needed.
d
Quantity of illuminated pixels at 4.4µm pixel pitch =
MOB 1:1 --> 37.1µm / 4.4µm · 1 = 8 MOB 5:1 --> 37.1µm / 4.4µm · 5 = 42
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foc
4.4µm
· β (Magnification of the measuring objective 1 or 5)
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11.2.2 Exchanging the measuring objective or the neutral density filter
For changing a measuring objective or the neutral-density filter, the plate on the side of the LaserQualityMoni­tor LQM+ has to be opened:
1. Turn off the laser.
2. Press down two locking bolts (see Fig. 11.1 on page32):
• The plate on the side will then jump out.
• The safety interlock is triggered (see chapter 9.3.1 on page26).
Optical components can be slid into the optical path of the LaserQualityMonitor LQM+ at three locations (see Fig. 11.1 on page32, Positions 1, 2, 3).
Slot Optical Component
1 5:1 Measuring objective
2 1:1 Measuring objective
3 Neutral density filter (OD-Filter)
4 5 6 Storage slots for unused components
Tab. 11.2: Slot positions of the optical components
Important: In order to prevent measurement errors, there should only ever be one measuring objective in the optical path at a time.
All insertions are coded differently via two dowels in order to keep the measuring objective and neutral-den­sity filter from getting mixed up. The measuring objective and OD filter are also equipped with an electronic memory chip (EEPROM). The EEPROM contains information on the measuring objectives and the OD filters that is displayed in the metadata of the LaserDiagnosticsSoftware LDS.
Locking Bolts (2x)
1 2 3
4
Fig. 11.1: Slot positions for the optical components
32
Receptacles (3x)
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NOTICE
Damage of the device
Contamination in the device can damage the optical components.
Seal unused slots with the provided dummy inserts.
X
Fig. 11.2: Dummy insert
DANGER
Serious eye or skin injury due to laser radiation
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When the safety interlock is not connected and the the side frame plate is opened, radiation (Laser class 4) reflected during measuring operation may escape from the device.
Only operate the device with a mounted housing plate.
X
3. Place the housing plate in the receptacles (see Fig. 11.1 on page32).
4. Flip the housing plate up until the two locking bolts clip into place.
5. Check that the housing plate is plan on the casing.
11.2.3 Neutral density filter
Depending on laser beam source and configuration of the LaserQualityMonitor LQM+, it can be necessary to reduce the power once more. This is done with a neutral density filter which is able to go into the beam path in front of the CCD sensor. The optical density of the filter can be varied between 1 (1:10) and 5 (1:100000).
Fig. 11.3: Neutral density filter
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11.3 Connect the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS
11.3.1 Connect device
1. Turn on the LaserQualityMonitor LQM+.
The operating mode is shown in the
status display (see chapter 10 on page29).
2. Start the LaserDiagnosticsSoftware LDS.
3. Click on the Devices tab.
4. Click on the + Connect to device button under the tab.
The Connections window appears.
5. Click on the desired device.
6. Click on the Connect to device but­ton.
11.3.2 Change the network address of a connected device
Proceed as follows in order to assign a dif­ferent IP address to a connected device:
1. Right-click on the device and select the Device settings menu point.
2. Enter in the desired IP address or use the Use DHCP option and con­firm the entry with OK.
3. Turn the LaserQualityMonitor LQM+ off and on again.
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11.4 Set up the LaserQualityMonitor LQM+ with the LaserDiagnosticsSoftware LDS
After performing manual alignment with the alignment tool as described in chapter 7.2 on page15 (only for an open beam measurement) or after inserting the fiber, you can check the alignment using a function of the LaserDiagnosticsSoftware LDS.
11.4.1 Choose the beam pointing function
1. Connect the device according to chapter 11.3 on page34 with the LaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ is
displayed as a connected device.
2. Click on CCD LQM+.
The menu Device control opens.
3. Click on the Beam pointing button or on the drop-down list measurement mode and Beam pointing.
The corresponding Device control
opens.
The Beam pointing workbench
opens with the following tools:
• Beam pointing stability with the windows: Position and Angle
• False-color image
Number of measuring points (planes)
Enter the number of measuring points shown in the Beam position workbench. It is preset to 30 planes.
Function CCD LQM+
Drop-down list Measuring mode
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11.4.2 Start beam search
1. Follow the safety instructions in chap­ter 11.1 on page30.
2. Turn on the laser.
3. Click on the Start button.
The progress of beam pointing
determination is indicated when Pre- caustic, Measuring beam pointing and then Adjustment successful are displayed in the notifications:
Pre-caustic
During the pre-caustic, the optimal z1 and z2 positions along the beam propagation are identified in the False-color image window (see also Fig. 11.4 on page39).
Measuring beam pointing
During the measurements, measuring points are constantly recorded at the posi­tions z1 and z2. The current position of the beam is marked with a large X, with previous posi­tions being marked with a small x.
Align the laser beam so that the cur­rent measuring point X is centered in the crosshairs as accurately as possible in the Position and Angle windows.
Only for a 1
Use the adjusting screws on the 1 tenuator module.
st
attenuator:
36
st
at-
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The display of the beam position in the Position and Angle windows can be switched to a display of Beam
pointing stability by clicking on the gear icon
You can reset the values for beam position stability in the Position and Angle windows by pressing the Reset button. You can log the Beam pointing stability as described in chapter 11.4.3 on page38.
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Adjustment successful
As soon as the laser beam has been properly aligned, the message Adjust- ment successful will appear
The display circle will change from red
to green.
4. Click on the Stop button.
5. Turn off the laser.
If the automated beam search is unable to find the leaser beam, enter the posi­tions of the measurements z1 and z2 for a manual beam search in accordance with chapter 11.4.4 on page39.
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11.4.3 Log beam pointing stability
You can log the beam pointing stability under Device control > Settings:
1. Enter the value of 0 in the Plane quantity field.
2. Click on the Projects tab.
3. Click on the Start button.
• Continuous measurement data for beam position stability is generated in the project tree.
4. Click on the Stopbutton.
5. Click on the Save icon in order to save the measurement data.
The measuring points in the Position and Angle windows can be deleted by clicking the gear icon and the
Reset button.
The measured data in the project tree is not deleted in the process.
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11.4.4 If the laser beam is not found
If the laser beam isn’t found during the automatic beam search or if the laser beam is too large for the mea­suring area (the laser beam exceeds the size of the CCD sensor), you can manually enter the position of the measurements z1 and z2 into the LaserDiagnosticsSoftware LDS for the beam search. The positions z1 and z2 define the scan range for the laser beam search.
Scaning rangeRaw beam
Focusing optics
280 0
Fig. 11.4: Position of the measurements z1 and z2 for entry into the adjustment preset fields
You can enter the measuring positions for the beam search under Device control > Settings:
1. Mark the checkbox Activate preset.
z1 z2
z
0
CCD sensor
2. Enter the measurement positions for
z1 and z2 into the z-axis position (z1/z2) fields.
3. Start the beam search according to chapter 11.4.2 on page36.
• If the laser beam still isn’t found, enter the modified values into the z-axis position (z1/z2) fields.
z1 z2
z
0
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11.5 Perform an automatic caustic measurement
For the purpose of getting to know the LaserQualityMonitor LQM+, this chapter describes an automatic caustic measurement with the LaserDiagnosticsSoftware LDS as an example. For a detailed description of the software installation, file management and evaluation of the measured data, please refer to the separate operating manual LaserDiagnosticsSoftware LDS.
11.5.1 Choose automatic caustic measurement mode
1. Connect the device according to chapter 11.3 on page34 with the LaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ is
displayed as a connected device.
2. Click on CCD LQM+.
The Device control menu opens.
3. Click on the Automatic Caustic but­ton or on the drop-down list measurement mode and Automatic Caustic.
The corresponding Device control
opens.
The Automatic Caustic toolbench
opens with the following tools:
• Caustic analysis
• Plane analysis
• Raw Beam Analysis
Function CCD LQM+
Drop-down list Measuring mode
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11.5.2 Configure settings (Device control > Settings)
1. Click on the Settings tab.
2. Select the calibrated wavelength of your LQM+ in nm.
3. Enter the laser wavelength used in nm.
4. Enter the laser output in W.
Only when measuring a time series
5. Enter the number of automatic caus­tic measurements.
6. Enter the measuring break between automatic caustic measurements in s.
11.5.3 Configure advanced settings (Device control > Advanced)
1. Click on the Advanced tab.
2. Enter the number of pixels in the x/y-direction in order to configure the resolution on the CCD sensor.
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3. Enter the number of planes. Specifying 21 planes already gener­ates a valid measurement.
Save preset
You can save information on the beam position in a file with preset.
If the laser beam isn’t found
1. Enter the determined values for z1 and z2 from the z-axis position into the entry fields in the Pre-caustic area as described in chapter 11.4.4 on page39.
2. Click on the Save icon in order to save the entry.
z1 z2
z
0
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11.5.4 Starting an automatic caustic measurement
1. Follow the safety instructions in chap­ter 11.1 on page30.
2. Turn on the laser.
3. Click on the Start button.
The progress of the measurement is
shown in the Pre-caustic, Measure-
ment caustic displays and then in Measurement ended:
Pre-caustic
As the indication is being displayed, the optimal measuring parameters such as measuring window position, measuring window size, integration time, and the z-range (measuring range along the beam propagation) are determined automatically.
Measuring caustic
The actual measurement is carried out during the indication.
Measurement completed
The measurement has been completed.
4. Turn off the laser.
11.5.5 Measurement results display
The measurement results are shown in the opened tools after the measurement is completed (see below).
A detailed description of the tools and the assessment of the measuring results can be found in the separate operating manual for the LaserDiagnosticsSoftware LDS.
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11.6 Perform power measurement
With LaserQualityMonitor LQM+ devices, the power measurement can be performed at 500W with a 1st at­tenuator. When there is an additional 2nd attenuator, the power can be measured separately at the 2nd attenu­ator. The measurements at the 1st and 2nd attenuators are performed in the same way.
Separately from the power measurement described in this chapter, the power measurement values are automatically recorded for a single plane, caustic, or automatic caustic measurement and shown under the Details table in the workbenches.
For the purpose of getting to know the LaserQualityMonitor LQM+, this chapter describes a power measure­ment with the LaserDiagnosticsSoftware LDS as an example. You can find more detailed information on LaserDiagnosticsSoftware LDS in the separate operating manual for the LaserDiagnosticsSoftware LDS.
11.6.1 Choose power measurement mode
1. Connect the device according to chapter 11.3 on page34 with the LaserDiagnosticsSoftware LDS.
The LaserQualityMonitor LQM+ is
displayed as a connected device.
2. Click on Power measurement1.
• The measurement is performed for
st
the 1
attenuator.
The corresponding Device control
opens.
The Power Measurement toolbench
opens.
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11.6.2 Configure settings (Device control)
1. Start and end a measurement as described in chapter 11.6.3 on pa­ge44.
Before the device offset can be deter­mined, the device must go through a thermalization period.
2. After a measurement has ended and without the laser turned on, press the Start button.
3. After the display in the Power Mea-
surement tool stabilizes, click on the Stop button.
4. Click on the Set current value as offset button.
• The value will show up in the Addi­tional Offset in W entry window.
• The device offset can also be entered manually.
5. Enter the measurement duration in min.
• If a measurement duration is not entered, the power will be measured indefinitely.
6. Enter the Measurement frequency in Hz.
11.6.3 Starting a power measurement
1. Follow the safety instructions in chap-
ter 11.1 on page30.
2. Turn on the laser.
3. Click on the Start button.
The progress of the measurement is
displayed.
When a measuring period is entered in the
Device control > Measurement dura­tion in min. entry window, the measure-
ment is terminated automatically.
4. Click on the Stop button.
• The measurement is completed.
5. Turn off the laser.
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11.6.4 Measurement results display
The measurement results are shown in the opened tool Power Measurement after the measurement is com-
pleted (see below). A detailed description of the tools and the assessment of the measuring results can be found in the separate operating manual for the LaserDiagnosticsSoftware LDS.
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12 Troubleshooting

Error Possible cause Remedy
Error during a measurement
Apart from the ambient noise and zero offset, no measuring signal is available.
The safety interlock has been triggered. The side frame plate is not
Error messages in LaserDiagnosticsSoftware LDS
Attention, the casing is open! Please close the casing again after changing the measuring objectives.
No measuring objectiv or two measuring objectives detected.
• Data transmission error
• Processor crash in the measuring system
• Program execution error
The device is not aligned correctly.
The power density in the focus is too low.
closed.
The temperature sensor in the device is measuring a temperature >60°C.
Possible cause Remedy
The side frame plate is not closed.
A measuring objectiv has not been inserted or two mea­suring objectives have been inserted into the device.
1. Restart the software.
2. Turn off the supply voltage, turn it on again, and start another reset cycle.
3. Restart the computer.
Check the device alignment to the laser beam.
Increase the laser power.
Close the side frame plate.
1. Turn off the laser immediately.
2. Check the cool water supply (only LQM+ HP and LQM+ 500 (cooled by water).
Close the side frame plate.
Insert only one measuring objective. Check the position of the measuring objective.
The measuring objectiv used is not cali­brated for this device, the accuracy can be increased considerably.
Measurement can’t be taken, the con­nection with the camera head has been disrupted. Please turn the device off and on again.
Error in saving the user-defined device settings, the parameters must be reset.
Internal device error. Turn the device off and on again. Device moves to the start position during this process.
Tab. 12.1: Troubleshooting
A measuring objectiv from a different device may have been inserted.
The device wasn’t able to initialize the camera head.
It wasn’t possible to save the device settings in the device.
The device is experiencing an internal error.
Check the inserted measuring objective. PRIMES should calibrate the measuring objectiv for higher accuracy.
Turn the device off and on again.
Save the device settings again.
Turn the device off and on again.
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13 Maintenance and service

The operator is responsible for determining the maintenance intervals for the measuring device. PRIMES recommends a maintenance interval of 12 months for inspection and validation or calibration. If the device is used only sporadically, the maintenance interval can also be extended up to 24 months.

14 Storage

Please note before storing devices with water cooling circuit:
NOTICE
Damage/destruction of the device caused by leaking or freezing cooling water
Leaking cooling water can damage the device. Storing the device at temperatures near or below freezing and without emptying the cooling circuit completely can damage the device.
Empty the lines of the cooling circuit completely.
X
Don’t use any compressed air to empty the cooling circuit.
X
To avoid contamination, please cover the apertures with the provided lid or optical tape.
X
Even when the lines of the cooling circuit have been emptied, a small amount of residual
X
water will remain in the device at all times. This may leak out and end up inside the device. Close the connector plug of the cooling circuit with the included sealing plug.
Store the device in the original PRIMES transport box.
X

15 Measures for the product disposal

Due to the Electrical and Electronic Equipment Act (“Elektro-G“) PRIMES is obliged to dispose PRIMES mea­suring devices manufactured after August, 2005, free of charge. PRIMES is a registered manufacturer in the German “Used Appliances Register“ (Elektro-Altgeräte-Register “EAR“) with the number WEEE-reg.-no. DE65549202.
Provided that you are located in the EU, you are welcome to send your PRIMES devices to the following ad­dress, where they will be disposed free of charge (this service does not include shipping costs):
PRIMES GmbH Max-Planck-Str. 2 64319 Pfungstadt Germany
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16 Declaration of conformity

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17 Technical data

Measurement Parameters LQM+ 20 LQM+ 200/500 LQM+ HP (10 kW) LQM+ HP (20 kW)
Power range for 1064 nm 20 W 200W
Pulse duration 100 fs - cw
Wavelength range
Beam dimensions 1.5–9mm Single mode:
Beam quality factor M² 1 - 50
Max. beam divergence 10 mrad
Determined parameters
Power density distribution 2D, 3D
Supply Data
Power supply 24V DC ±5%, max. 1.8A
Cooling Air cooling Air cooling (opt.
Cooling water pressure ---
340 – 360 nm (UV)/
515 – 545 nm (Green)/
1030–1090 nm (NIR)
(opt. 500W)
Water cooling)
2 bar primary pressure with an
unpressurized outflow, max. 4 bar
M² < 5 = 3kW
M² > 5 = 10kW
532nm
on request/
1030–1090 nm
(NIR)
Water cooling Water cooling
M² < 5 = 5kW
M² > 5 = 20kW
1 030–1 090 nm
(NIR)
14–16mm
Multi mode:
18–22mm
min. 4 bar
Min. Cooling water flow rate --- 1,5l/min 7l/min 18l/min
Cooling water temperature T
1)
Please consult with PRIMES before doing anything that does not comply with this specification.
Communication
Interface Ethernet
Dimensions and Weight
Dimensions (L x W x H) 285 x 190 x 180 mm 350 x 230 x 190 mm 480 x 300 x 190 mm 495 x 320 x 190 mm
Weight approx. 10 kg approx. 18 kg approx. 35 kg approx. 35 kg
Environmental Conditions
Operating temperature range 10 – 40 °C
Storage temperature range 5 – 50 °C
Reference temperature 22 °C
Permissible relative humidity (non-condensing)
1)
in
–- Dew point temperatur < Tin < 30 °C
10 – 80 %
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18 Dimensions

18.1 LQM+ 20
150
Ansicht A
View A
285
A
A
175
170
All dimensions in mm (general tolerance ISO2768-v)
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A
18.2 LQM+ 200/500 (without bottom plate)
310 75
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A
285
385
299.3
413.7
View A
Ansicht A
177
150
ca. 5
169.5
129.5
89.9
All dimensions in mm (general tolerance ISO2768-v)
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18.3 LQM+ HP
104.9
109.9
101.5
320
185
190
480
494.5
All dimensions in mm (general tolerance ISO2768-v)
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19 Appendix

19.1 Changing the factory setting on the LQM+ 20/200UV
NOTICE
Damage/Destruction of optical components
Changing the factory settings may lead to damages to the device during the measuring operation.
Changing the factory settings for positioning range is only allowed by well trained and expe-
X
rienced personnel. In case of any doubt, please contact PRIMES service.
The length of the internal beam path is influenced by the movement of prisms inside the device. Depending on the optical properties and the pulse parameters of a laser source, damages to the internal optical ele­ments can occur. Especially in case of short pulsed UV-lasers the damages are foreseen. To prevent the device from getting damaged and to avoid a positioning of a prism close to the internal focus, a shortened positioning range can be chosen.
The LaserQualityMonitor LQM+ 20/200UV is typically delivered with the shortened positioning range as a factory setting. Factory settings for standard and shortened positioning range are preset by a jumper, see picture below.
You can change the positioning range by replugging a jumper in the device.
DANGER
Serious eye or skin injury due to laser radiation
If a safety interlock is not connected, a reflected beam (Class 4 Laser) may escape from the device when the laser is turned on and the side frame plate is open.
Turn off the laser before removing the housing plate.
X
1. Turn off the laser.
2. Turn off the power supply of the LQM+.
3. Remove the housing plate on the side of the device by press­ing down the two locking bolts (see red arrows).
The housing plate will then jump
out.
Jumper
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NOTICE
Component susceptible to electrostatic discharge
The circuit board could be destroyed by electrostatic discharge.
Before reconnecting the jumper, put on an ESD armband.
X
4. Before switching the jumpers, put on an ESD armband.
5. On the board you can find a jumper which has to be brought into the desired position.
6. Place the housing plate in the receptacles (see Fig. 11.1 on page32) in the casing.
7. Flip the housing plate up until the two locking bolts clip into place.
8. Check that the housing plate is plan on the casing.
9. Turn on the LaserQualityMonitor LQM+.
• The device moves the prism carriage to a reference point and stops.
• After referencing is initiated, the prism carriage will be located within the allowable range.
Position Shortened positioning range
(factory setting for ultra short pulse laser)
Position B: Complete positioning range
(factory setting for continuous wave laser)
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19.2 HighYAG collimation module up to 6 kW
DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations without taking the following precautions. All precautions must be taken, even when the fiber is in the collimator or fiber adapter.
Please wear safety goggles adapted to the power, power density, laser wave length and
X
operating mode of the laser beam source in use.
Wear suitable protective clothing and protective gloves.
X
Protect yourself from laser radiation by separating protective devices (e.g. by using appro-
X
priate shielding).
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As an option PRIMES offers a 67mm HighYAG collimation module which can be mounted directly to the 2 attenuator of the LQM+ HP.
Specifications
Max. power 6kW (multi mode)
3kW (single mode)
Focal length 67mm
Acceptable divergence 160mrad (half angle)*
Wavelength range 1025 – 1080nm
Design wave length 1064nm
Fibre core diameter 10 – 1000 µm
Fibre socket LLK-D & QBH (LLK-B on request)
* If the 67mm collimation module is operated with LQM+ HP the divergence (half angle) cannot be more than 110mrad.
Tab. 19.1: Specifications of the 67mm HighYAG collimation module up to 6kW
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19.2.1 Key data for the cooling system for the HighYAG collimation module
Specifications
Max. cooling water pressure 6bar
Min. cooling water flow rate 2l/min
Cooling water quality Deionized water with corrosion inhibitor
Filter mesh <100µm
Tab. 19.2: Specifications of the cooling system
Cooling circuit
LQM+ HP (return flow)
Cooling circuit
LQM+ HP (inlet flow)
Fig. 19.1: Water connections
19.2.2 Schematic of the cooling system for the HighYAG collimation module
Important: The collimator cannot be connected to the cooling circuit of the LQM+ HP, but rather to the cooling circuit of the fiber.
Fiber adapter
Collimator
Fig. 19.2: Scheme cooling curcuit collimation module
Cooling circuit
collimator
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19.2.3 Remove/Install the HighYAG collimation module
Necessary tools:
• Allen key, a. f. 2.5mm
• Allen key, a. f. 3mm
NOTICE
Damage/Destruction of optical components
A contaminated measuring objectiv can heat up, change optical properties and potentially be damaged.
To avoid contamination, only perform work in a clean environment.
X
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Fig. 19.3: Position of the collimation module
1. Turn off the power supply of the LQM+.
2. Loosen four set screws A by using the provided allen key (a. f. 2.5mm).
3. Remove four covers B.
4. Remove four screws C by using the provided allen key (a. f. 3mm)
5. Install the protective cover D for storage of the collimation module.
6. After disassembling the collimation module, install the fiber adapter to the attenuator module again.
7. Protect the aperture of the fiber adapter against dust by the red cab or with optical tape.
B
C
A
D
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col
LQM
fibercorefoc
f
f
dd ⋅=
fibercore
dM⋅
⋅⋅
=Θ
π
λ
2
4
19.2.4 Choosing the measuring objective with a HighYAG collimation module installed
Example 1:
λ = 1030 nm M² = 12 d
= 100µm
fibercore
f = focal length
fibercore
d
= 299µm
foc
To enable a measurement within ±3 zR the estimated number of illuminated pixels at the focus should be less than 350.
d
foc
· β
Quantity of illuminated pixels at 4.4µm pixel pitch =
Measuring objective (MOB) 1:1 --> 299µm / 4,4µm x 1 = 68 Measuring objective (MOB) 5:1 --> 299µm / 4,4µm x 5 = 340
4,4µm
(Magnification of the measuring objective 1 or 5)
Example 2:
λ = 1064nm M² = 5.5 d
= 50µm
fibercore
Θ = 150mrad
150mrad · 67mm
= = 10.05mm
d
rawbeam
1m
d
rawbeam
=
fibercore
Θ · f
1m
col
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14
12
10
8
6
4
Beam diameter in mm
2
0
1 10
M²
Fig. 19.4: Range of application of the LQM+ measuring objectives
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100
Measuring objective (MOB) 1:1 --> Measuring objective (MOB) 5:1 -->
The two examples demonstrates the calculation of beam parameters based on a given collimator focal length. The calculation can also be done using other collimator focal lengths.
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19.3 IPG collimation module up to 20 kW
DANGER
Serious eye or skin injury due to laser radiation
During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4).
The LaserQualityMonitor LQM+ cannot be operated in any of the available configurations without taking the following precautions. All precautions must be taken, even when the fiber is in the collimator or fiber adapter.
Please wear safety goggles adapted to the power, power density, laser wave length and
X
operating mode of the laser beam source in use.
Wear suitable protective clothing and protective gloves.
X
Protect yourself from laser radiation by separating protective devices (e.g. by using appro-
X
priate shielding).
As an option PRIMES offers a IPG collimation module which can be mounted directly to the 2 the LaserQualityMonitor LQM+.
Specifications
Max. power 20kW (Multi mode)
5kW (Single mode)
Focal length 100mm 120mm 160mm 180mm 200mm
Acceptable divergence 220mrad 190mrad 140mrad 110mrad 110mrad
Design wave length 1070nm
Fibre socket HLC 8 und HLC 16
Tab. 19.3: Specifications of the IPG collimation module up to 20kW
For the measurement of a divergent beam emerging from a fiber, the user is free to combine the LQM+ HP (20 kW) with any collimator that is suitable for the required power range and produces a minimum of artifacts.
At the date of issue (August 2018), we are only aware of one supplier (IPG Photonics) delivering collimator units with a specification of 20kW. As an option, PRIMES can combine the LQM+ HP with a collimator from that supplier.
The following table lists the available collimators from that source and the nummerical aperture that can be measured if these collimators are combined with the LQM+ HP (20kW).
nd
attenuator of
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Table 2: Possible combinations of the LQM 20kW with IPG collimators and resulting NA for a measurement. Color code is corresponding to the resulting diameter of the collimated light. Light green: diameter suitable for single mode measurement(< 2mm*mrad), dark green: diameter suitable for multi mode measurement(> 2mm*mrad).
(full angle) f (collimator) / mm
NA diverg ence / ra d 100 120 160 180 200
0,03 0,0600 6,00 7,20 9,60 10,80 12,00
0,035 0,0700 7,00 8,40 11,20 12,60 14,00
0,04 0,0800 8,00 9,60 12,81 14,41 16,01
0,045 0,0900 9,01 10,81 14,41 16,21 18,01
0,05 0,1000 10,01 12,01 16,02 18,02 20,02
0,055 0,1100 11,01 13,22 17,62 19,82 22,03
0,06 0,1200 12,02 14,42 19,23 21,63 24,04
0,065 0,1301 13,02 15,63 20,84 23,44 26,05
0,07 0,1401 14,03 16,84 22,45 25,25 28,06
0,075 0,1501 15,04 18,05 24,06 27,07 30,08
0,08 0,1601 16,05 19,26 25,67 28,88 32,09
0,085 0,1702 17,06 20,47 27,29 30,70 34,11
0,09 0,1802 18,07 21,68 28,91 32,52 36,14
0,095 0,1902 19,08 22,90 30,53 34,35 38,16
0,1 0,2003 20,09 24,11 32,15 36,17 40,19
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19.3.1 Possible combinations of the LaserQualityMonitor LQM+ HP (20 kW) with IPG collimators
Possible combinations of the LQM+ HP (20kW) with IPG collimators and resulting nummerical aperture (NA) for a measurement. Color code is corresponding to the resulting diameter of the collimated light.
Light green: diameter suitable for single mode measurement (<2mm ∙ mrad), Dark green: diameter suitable for multi mode measurement (>2mm ∙ mrad).
(Full angle) Focus (Collimator) / mm
Divergence / rad
Tab. 19.4: Possible combinations of the LaserQualityMonitor LQM+ HP (20kW) with IPG collimators
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Table 2: Possible combinations of the LQM 20kW with IPG collimators and resulting NA for a measurement. Color code is corresponding to the resulting diameter of the collimated light. Light green: diameter suitable for single mode measurement(< 2mm*mrad), dark green: diameter suitable for multi mode measurement(> 2mm*mrad).
(full angle) f (collimator) / mm
NA diverg ence / rad 100 120 160 180 200
0,03 0,0600 6,00 7,20 9,60 10,80 12,00
0,035 0,0700 7,00 8,40 11,20 12,60 14,00
0,04 0,0800 8,00 9,60 12,81 14,41 16,01
0,045 0,0900 9,01 10,81 14,41 16,21 18,01
0,05 0,1000 10,01 12,01 16,02 18,02 20,02
0,055 0,1100 11,01 13,22 17,62 19,82 22,03
0,06 0,1200 12,02 14,42 19,23 21,63 24,04
0,065 0,1301 13,02 15,63 20,84 23,44 26,05
0,07 0,1401 14,03 16,84 22,45 25,25 28,06
0,075 0,1501 15,04 18,05 24,06 27,07 30,08
0,08 0,1601 16,05 19,26 25,67 28,88 32,09
0,085 0,1702 17,06 20,47 27,29 30,70 34,11
0,09 0,1802 18,07 21,68 28,91 32,52 36,14
0,095 0,1902 19,08 22,90 30,53 34,35 38,16
0,1 0,2003 20,09 24,11 32,15 36,17 40,19
The use of the measuring objectives 1:1 and 5:1
Using measuring objectives of 2 different magnifications, the range of M² values that can be measured is extended. The following table lists the combination of beam diameters and M² values that are accessible, and which measuring objective must be used for this combination.
Table 3: The use of the 5:1 (dark green) and 1:1 (light green) measuring objective. Dark grey: SM beam, diameter too large. Light grey: MM beam, spot diameter in internal beam path too large. The numbers correspond to the spot diameter (unit µm) in the internal beam path, which must be below 700 µm. Up to 1.2mm internal spot size, a measurement is possible with higher uncertainty of measurement yellow, (<10% diameter deviation, less than 3 Rayleigh-lengths of measurement range in z will be available).
Beam Quality M²
1 1,2 1,4 1,6 1,8 2 4 5 6 10 15 20 25 30 40 45
8 42 51 59 67 76 84 169 211 253 422 633 844 1054 1265 1687 1898
9 37 45 52 60 67 75 150 187 225 375 562 750 937 1125 1500 1687
10 34 40 47 54 61 67 135 169 202 337 506 675 844 1012 1350 1518
11 31 37 43 49 55 61 123 153 184 307 460 613 767 920 1227 1380
12 28 34 39 45 51 56 112 141 169 281 422 562 703 844 1125 1265
13 26 31 36 42 47 52 104 130 156 260 389 519 649 779 1038 1168
14 24 29 34 39 43 48 96 121 145 241 362 482 603 723 964 1085
15 22 27 31 36 40 45 90 112 135 225 337 450 562 675 900 1012
16 21 25 30 34 38 42 84 105 127 211 316 422 527 633 844 949
17 119 198 298 397 496 595 794 893
18 112 187 281 375 469 562 750 844
19 107 178 266 355 444 533 710 799
20 101 169 253 337 422 506 675 759
21 96 161 241 321 402 482 643 723
22 92 153 230 307 383 460 613 690
Beam Diameter / mm (2nd moment)
Beam Quality M²
1 1,2 1,4 1,6 1,8 2 4 5 6 10 15 20 25 30 40 45
8 1,5 1,5 1,5 1,5 1,5 1,5 2,0 3,0 4 4 4 4 4
9 2,0 2,0 2,0 2,0 2,0 2,0 2,5 4,0 5 5 5 5 5 5 10 2,5 2,5 2,5 2,5 2,5 2,5 3,5 4,5 6 6 6 6 6 6 11 3,0 3,0 3,0 3,0 3,0 3,0 3,5 5,5 7 7 7 7 7 7 12 3,5 3,5 3,5 3,5 3,5 3,5 4,5 7,0 9 9 9 9 9 9 9 13 4 4 4 4 4 4 5,5 7,5 10 10 10 10 10 10 10 10 14 5 5 5 5 5 5 7 9 12 12 12 12 12 12 12 12 15 5 5 5 5 5 5 8 11 14 14 14 14 14 14 14 14 16 5 5 5 5 5 5 9 12 16 16 16 16 16 16 16 16 17 18 18 18 18 18 18 18 18 18 20 20 20 20 20 20 20 20 19 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 21 20 20 20 20 20 20 20 20 22 20 20 20 20 20 20 20 20
Beam Diameter in mm (2nd Moment)
19.3.2 The use of the measuring objectives 1:1 and 5:1
Using measuring objectives of two different magnifications, the range of measured is extended. The following table lists the combination of beam diameters and beam quality M² val­ues that are accessible, and which measuring objective must be used for this combination.
Dark grey: Single mode beam, diameter too large. Light grey: Multi mode beam, spot diameter in internal beam path too large.
Beam quality M²
Beam diameter / mm
(second moment method)
beam quality M² values that can be
Tab. 19.5: The use of the 5:1 (dark green) and 1:1 (light green) measuring objective
The numbers correspond to the spot diameter (unit μm) in the internal beam path, which must be below 700μm. Up to 1.2mm internal spot size, a measurement is possible with higher uncertainty of measurement yellow, (<10% diameter deviation, less than 3 Rayleigh-lengths of measurement range in z will be available).
19.3.3 Maximum Power
This table is a summary of the tables above and lists the maximum power the LQM+ HP can measure as a function of beam quality M² and beam diameter.
Beam quality M²
Tab. 19.6: Maximum power
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Beam diameter / mm
(second moment method)
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19.4 Optical path in LQM+ HP (with IPG Collimator)
61
f = 67
2nd Attenuator
1st Beamsplitter
Fiber
Collimator
Beam entrance LQM+
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110.8
69.3 25
Adjustable prism
st
1
Attenuator
Fig. 19.5: Optical Path in LQM+ HP (with IPG Collimator)
5:1 optics
LQM+ 20 basic device
Length of the optical path ( ):
1st Attenuator <--> LQM+ = 25mm + 69.3mm = 94.3mm 2nd Attenuator <--> LQM+ = 25mm + 110.8 + 61mm = 196.8mm
z = 280
0 to 140
z = 0
CCD
1:1 optics
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20 Formula and algorithms for raw beam back calulation

To calculate the raw parameters from the measured beam parameters of the focus, the formula given in ISO11146 is used. Index F describes the beam parameters of the focus.
z
R
Fig. 20.1: Raw beam back calculation
Beam waist radius within the raw beam
Far field divergence
H1H
2 3
x
1
z
0
f f
2
z
RF
1
x
2
z
0F
Position of beam waist within the raw beam
Rayleigh length within the raw beam
With focus position difference
Beam diameter onto the focusing lens
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