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QBD-series Pockels cell drivers

Applications

  • Q-switching

Features

  • Push-up or pull-down modifications (fixed)
  • Up to 6 kV output voltage
  • Up to 100 kHz repetition rate
  • < 20 ns rise time or < 20 ns fall time (leading edge)
qbd-manual-en.pdf

Download user manual (430kB)

QBD-series consists of several Pockels cell driver circuit boards that differ with output voltage range (up to 6.0 kV bipolar) and operating scheme (see also How to order? section). 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.

QBD-series is specially designed to control Pockels cells by applying a fast switching high voltage. The modules require +24 V DC power supply and pulse generator to set an operating frequency. An output voltage level can be programmed in working range by user either manually (through onboard configuration trimpot) or remotely (applying a DC voltage to the respective pin).

There are two possible modifications of output signal type:

  • push-up (= normally off scheme), when a base voltage level equals to zero
  • pull-down (= normally on scheme), when pulses from base bias voltage to ground are generated.
The desired one should be chosen at the time of ordering and could not be changed by user.

qbd-h60.gif

QBD-series is based on MOSFET technology and offers high repetition rates and fast transition time for a leading pulse edge. The recovery time by QBD is relatively long (5‑10 μs for the trailing pulse edge vs < 20 ns by QBU).

Performance

For instance, QBD-5020-UP/DN kept cool enough and running with proper load (Pockels cell with 5-7 pF capacitance plus 30-50 cm connection cable) has typical performance as below:

Output voltage, kV
Repetition rate, kHz (*)
2.00
80-120
3.00
40-60
4.00
23-35
5.00
15-22

(*) The values are approximate, exact performance depends on actual load capacitance and cooling conditions.

In burst mode (i.e. for short term operations) the performance increases approximately twice and exceeds 100 kHz at low operating voltages and low load capacitances.

The performance deteriorates for higher load capacitance.

Input:

Voltage
+24 V DC

Output:

Modifications by working modes
pull-down (= normally on)
or push-up (= normally off)
Voltage, high level
regulated, up to 6 kV 1
Voltage, low level
fixed, 0 V
Maximal repetition rate
up to 100 kHz and higher (load and voltage dependant, see also Performance section) 1
Rise time (fall time)
< 20 ns 2
Recovery time
5-10 us (depends on load)
Jitter
10 ns
Delay time
1 us
Load capacitance
up to 0.5 nF 1

Environment:

Operation temperature
+10 … +40 °C (wider temperature range is available on request)
Storage temperature
-20 … +60 °C
Humidity
0 ... 90%, non-condensing

Other:

Size (LxWxH)
110x80x25 mm
Weight
0.1 kg
1) these parameters aren't indepenent and cannot achieve their maximum at the same time
2) 10-90% level, guaranteed at load capacitance 23 pF and below

Pull-down (normally on) modifications

Model *
Description
QBD-6024-DN
Pull-down scheme,
2.4-6.0 kV high voltage adjustment range
QBD-5020-DN
Pull-down scheme,
2.0-5.0 kV high voltage adjustment range
QBD-4016-DN
Pull-down scheme,
1.6-4.0 kV high voltage adjustment range
QBD-3012-DN
Pull-down scheme,
1.2-3.0 kV high voltage adjustment range
QBD-2008-DN
Pull-down scheme,
0.8-2.0 kV high voltage adjustment range
QBD-1004-DN
Pull-down scheme,
0.4-1.0 kV high voltage adjustment range

(*) Other output voltages are available on request

Push-up (normally off) modifications

Model *
Description
QBD-6024-UP
Push-up scheme,
2.4-6.0 kV high voltage adjustment range
QBD-5020-UP
Push-up scheme,
2.0-5.0 kV high voltage adjustment range
QBD-4016-UP
Push-up scheme,
1.6-4.0 kV high voltage adjustment range
QBD-3012-UP
Push-up scheme,
1.2-3.0 kV high voltage adjustment range
QBD-2008-UP
Push-up scheme,
0.8-2.0 kV high voltage adjustment range
QBD-1004-UP
Push-up scheme,
0.4-1.0 kV high voltage adjustment range

(*) Other output voltages are available on request

Example

QBD-5020-DN
Pull-down scheme,
2.0-5.0 kV high voltage adjustment range
qbd-manual-en.pdf

Download user manual (430kB)

qbd-step.zip

Download STEP model (ZIP archive, 3.2MB)