HAMAMATSU R943-02 Datasheet

GaAs (Cs) Photocathode, Wide Spectral Response, 51 mm (2") Diameter

Head-on Type for Photon Counting, Low Dark Counts, Excellent P.H.D.

FEATURES

● Wide Spectral Response ............. 160 nm to 930 nm

High Quantum Efficiency in Near IR

●

... 14 % at 632.8 nm

● Fast Rise Time ................................. 3.0 ns at 1500 V

● Excellent Single Photoelectron

Pulse Height Distribution

........................... Peak to Valley Ratio 2.3 (at -20 °C)

-1

● Low Dark Counts ..................... 20 s

Typ. (at -20 °C)

APPLICATIONS

● Raman Spectroscopy

● Fluorescent Spectroscopy

● Astrophysical Measurement

● Laser Detection

PHOTOMULTIPLIER TUBE

R943-02

Hamamatsu R943-02 is a 51 mm (2") diameter head-on type photomultiplier tube having GaAs (Cs) photocathode and synthetic
silica window. The combination of the GaAs photocathode and the synthetic silica window allows high sensitivity over a wide spectral
range from UV to IR (160 nm to 930 nm).
The R943-02 is selected for photon counting and features low dark counts and excellent pulse height distribution (PHD) of single
photoelectrons.

GENERAL

Parameter Description / Value Unit

Spectral Response
Wavelength of Maximum Response
Photocathode
MateriaI
Minimum Effective Area
Mode
Window Material
Dynode
Secondary Emitting Surface
Structure
Number of Stages
Direct Interelectrode Capacitances
Anode to Last Dynode
Anode to All Other Electrodes
Base

SuitabIe Socket

Weight
Operating Ambient Temperature
Storage Temperature

160 to 930
300 to 850

GaAs(Cs)

10 × 10

Opaque

Synthetic silica glass

Cu-BeO

Linear focused

10

Approx. 2.7
Approx. 5.0

21-pin glass base

E678–21C (supplied)

E678–21D (sold separately)

A

93

-30 to +50

-80 to +50

nm
nm

—

mm

—
—

—
—
—

pF
pF

—

—

g

°C
°C

Figure 1: Typical Spectral Response

TPMHB0281EA

2

10

1

10

10

QUANTUM EFFICIENCY (%)

10

CATHODE RADIANT SENSITIVITY (mA/W)

10

QUANTUM
EFFICIENCY

CATHODE
RADIANT

0

-1

-2
200 400 600 800 1000

SENSITIVITY

WAVELENGTH (nm)

Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are

subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2003 Hamamatsu Photonics K.K.

PHOTOMULTIPLIER TUBE R943-02

MAXIMUM RATINGS (Absolute Maximum Values)

Parameter Value Unit

Supply Voltage
Between Anode and Cathode
Between Anode and Last Dynode
Average Anode Current
Average Pulse Count Rate
Average Cathode Current

CHARACTERISTlCS (at 25 °C)

Cathode Sensitivity

Quantum Efficiency

at 253.7 nm (Hg-Line)

at 632.8 nm (He-Ne Laser)
Luminous
Radiant at 253.7 nm (Hg-Line)

Red/White Ratio

Anode Sensitivity

Luminous
Radiant at 253.7 nm (Hg-Line)

Gain
Equivalent Anode Dark Current
Anode Dark Counts
Single Photoelectron PHD (Peak to Valley Ratio)
Time Response

Anode Pulse Rise Time
Electron Transit Time

F

at 632.8 nm (He-Ne Laser)

at 700 nm

at 852.1 nm (Cs-Line)

F

at 632.8 nm (He-Ne Laser)

at 700 nm

at 852.1 nm (Cs-Line)

H

B

C

D

Parameter Typ. Unit

E

Min.

—
—

300

—
—
—
—

G

H

—

150

—
—
—
—
—

J

K

—
—
—

H

L

M

—
—

2200

250

1

6 × 10

1

15
14

600

30
70
71
65

0.58

300

1.5 × 10

3.5 × 10

3.6 × 10

3.3 × 10
5 × 10

1

20

2.3

3.0
23

V
V

µA

6

-1

s
nA

Max.

—
—
—
—
—
—
—

%

%
µA/lm
mA/W
mA/W
mA/W
mA/W

—

4

4

4

4

5

—
—
—
—
—

10
50

—

—
—

—

A/lm
A/W
A/W
A/W
A/W

—

nA

-1

s

—

ns
ns

NOTES

A For cooling operation, another ceramic socket, type number E678-21D is

recommended, because the teflon socket type number E678-21C supplied
with the tube is not suitable for cooling operation due to its high thermal
expansion coefficient. Alternatively, it is recommended to solder a resistor,
capacitor, etc. directly on stem pins using a socket contact (100-2520S)
supplied by Winchester.

B Averaged over any interval of 30 seconds maximum.
C Measured at single photoelectron level. The discriminator level is set at val-

ley point.

D In practical operation, the cathode current should be lower than 0.1 nA to

prevent shortening the life of the photocathode.

E Supply voltage is 150 volts between the cathode and all other electrodes.
F The light source is a tungsten filament lamp operated at a distribution tem-

perature of 2856 K.

G The quotient of the cathode sensitivity measured with the light source is

the same as Note E passing through a red filter (Toshiba R-68) divided by
the cathode luminous sensitivity without the red filter.

H Measured with supply voltage and voltage distribution ratio in Table 1.
J Measured with supply voltage to provide the anode luminous sensitivity of

200 (A/lm) and the voltage distribution ratio in Table 1 after 30 minute stor­age in the darkness.

K Measured with supply voltage that gives 2 × 10

distribution ratio shown in Table 1 after one hour storage in the cooler set
at -20 °C.
The discriminator is set at 1/3 of a single photoelectron level.

6

gain and with the voltage

L The rise time is the time it takes the output pulse to rise from 10 % to 90 %

of the peak amplitude when the entire photocathode is illuminated by a
delta function light pulse.

M The electron transit time is the interval between the arrival of a delta func-

tion light pulse at the entrance window of the tube and the time when the
output pulse reaches the peak amplitude. In measurement the entire pho­tocathode is illuminated.

Table 1: Voltage Distribution Ratio

Electrode K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8

Distribution Ratio

SuppIy Voltage : 1500 V, K : Cathode, Dy : Dynode, P : Anode

Replacement Information

The R943-02 is similar to the Burle C31034 series photomultiplier tube. The base
and voltage divider are different.

31.51111111

Dy9

Dy10

P

11

Warning–Personal Safety Hazards

Electrical Shock — Operating voltages

applied to this device present a shock hazard.