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QBY-4001 / QBY-4010 GaN Pockels cell drivers

Applications

  • Pulse slicing, pulse picking
  • Control of laser regenerative amplifiers

Features

QBY-4001 QBY-4010
• Cooling free air forced air
• Max. rep. rate 1 kHz @4kV 10 kHz @4kV
• Dimensions, mm 80x50x20 80x71x28
  • Input 24 V DC
  • Output voltage up to 4 kV (bipolar)
  • Adjustable pulse width, 10-1000 ns (other on request)
  • 3-4 ns rise / fall time
  • Compact dimensions
QBY-manual-en.pdf

Download manual (1 Mb)

QBY-4001 and QBY-4010 are Pockels cell drivers by OEM Tech based on GaN transistors, which provide bipolar voltage pulses (3-4 ns rise/fall) on the outputs to control the birefringence of an electro-optical crystal to change the polarization state of light passing through. The QBY-4001 was designed as a very compact model with fast switch to obtain short pulses starting from 10 ns. The QBY-4010 is equipped with cooling fans, which made it possible to increase the max. rep. rate in ten times at the maximal voltage in comparison with QBY-4001, however the dimension of the system is slightly greater.

It is possible to adjust pulse amplitude by analog input signal and pulse repetition rate and width by external TTL signals J1 and J2 (see the picture below). Output voltage is up to 4 kV, max. rep. rate strongly depends on selected output voltage value and on load capacitance (we recommend therefore to use the shortest possible cables and choose a Pockels cell with lower capacitance).

QBY output voltage and J1 J2 TTL signals time diagram

The module requires +24 V DC power supply and a pulse generator to set an operating frequency and pulse width.

Please, note that by bipolar device an output pulse voltage U is formed by applying +U/2 to positive output wire and –U/2 to negative.

The module was designed to work in set-reset scheme when a base voltage level equals to zero. Non-periodic pulses are also possible, set by pulse generator.

The module is very sensitive to load capacitance. In order to keep its performance close to datasheet values, one needs to minimize the load capacitance, numbers less than 5 pF are appreciated.


Input:

Voltage
+24±5% V DC
Current
300 mA max

HV Output:

Type
bipolar
Pulse amplitude, VMAX
adjustable, approx. in range: 0 - 4 kV
Pulse width
adjustable, 10 - 1000 ns (other on request)
Rise / fall time 1
3-4 ns
Delay time
≤10 ns
Jitter
≤0.2 ns
Load capacitance
5 pF recommended, 10 pF maximum
Max. repetition rate 2
at +25°C and 5pF load

Uout, kV
4
3
2
1.5
1
≤0.7


for QBY-4001, kHz

1
5
15
25
40
50


for QBY-4010, kHz

10
15
30
40
80
100

Environment:

Operation temperature
-30 … +60 °C
Cooling
free air for QBY-4001
forced air with fans for QBY-4010

Other:

Protections
from overheating
Size (LxWxH)
80x50x20 mm for QBY-4001
80x71x28 mm for QBY-4010
Weight
<0.045 kg for QBY-4001
1) 10-90% level
2) load and voltage dependant, see also manual
PCB version QBY-4001, PCB+fans QBY-4010 and encased QBY-BT versions are available:
Pockel cell driver QBY-4001 GaN transistor board
Pockel cell driver QBY-4010 GaN transistor board
Pockel cell driver QBY-BT GaN transistor board

QBY-manual-en.pdf

Download manual (1 Mb)