Koheron CTL101 Series, CTL101-1, CTL101-2 User Manual

CTL101 - User Guide

Laser connections

The CTL101-1 / CTL101-2 is compatible with Type 1 / Type 2 butterfly laser diodes. Note that it is only compatible
with floating diodes, which means that neither the anode nor the cathode should be connected to the case.

Butterfly laser type 1 pin configuration

Butterfly laser type 2 pin configuration

Quickstart

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1. Make sure the laser current switch (CURR) and the TEC current switch (TEMP) are OFF. Set the TPROT switch
ON.

2. Set the VCC jumper to 5V.

3. Plug the laser diode on the ZIF socket. Make sure there is a good thermal connection between the laser case
and the base plate. Use thermal paste if necessary.

4. Power the board with 5 V on VCC pin (set the VCC jumper accordingly). The power supply must be able to
supply at least 2 A (2.5 A for the 800 mA version).

5. Set the current to 0 mA by turning the laser current trimmer (CURR) counter-clockwise.

6. Turn the POWER switch ON.

7. Adjust the temperature trimmer to get 2.5 V on the TSET pin.

8. Turn ON the TEC current switch.

9. Check that the voltage between the TSET and TACT pins converges towards zero. The laser temperature is now
stabilized at 25 °C.

10. Turn ON the laser current switch.

11. Turn the laser current trimmer (CURR) clockwise to reach the desired laser current.

Enable switch

CURR: Turn ON to enable laser current.
TEMP: Turn ON to enable TEC current.
TPROT: When this switch is ON, the laser current is automatically disabled in case of a TEC fault condition (see

FAULT LED).

LEDs

LASER: The brightness of this LED is proportional to the laser power measured on the monitoring photodiode.
FAULT: Indicates a TEC fault condition, i.e. when the TEC driver is no longer capable of cooling the laser at the
desired temperature.

Terminal block connections

VCC: Connect this pin to a 5V or 6V power supply. Using a 6V supply provides 1 V of extra compliance voltage.

The VCC jumper must be set according to the chosen power supply.

TACT: Temperature monitoring pin. The thermistor value is given by
Rth = 10 kΩ * (10 V - V

TACT

) / (5 V + V

TACT

).

The pin output impedance is 1 kΩ.

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