envelope-o linkedin youtube at document map phones question user phone twitter facebook bars angle-left angle-right angle-up angle-down vk

QBU-mini Pockels cell drivers

Applications

  • Q-switching
  • Pulse picking, pulse slicing

Features

  • Compact (as small as 140x50x20 mm)
  • Output is triggered by an arbitrary external TTL signal
  • Up to 3.5 kV output voltage
  • Up to 50 kHz repetition rate (depends on voltage)
  • < 15 ns rise time and fall time
qbu-mini-manual-en.pdf

Download user manual (365kB)

QBU-mini-series consists of several Pockels cell driver circuit boards that differ with output voltage range (up to 3.5 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.

QBU-mini-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 and pulse width. 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).

Triggering by an external low voltage arbitrary TTL signal allows modules to work in next scenarios:

  • 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
  • user-defined scheme, with arbitrary width and frequency of pulses.
  • output signals triggered by TTL

    QBU-mini-series is based on MOSFET technology and offers high repetition rates and fast transition time (< 15 ns) for both pulse edges.

    Kept cool enough with forced air cooling, at low load capacitance and low operating voltage modules may achieve a performance up to 30 kHz (continuous mode) or 50 kHz (burst-mode). At the full load (3.5 kV, 11 pF) repetition rate is higher than 8 kHz.

Input:

Voltage
+24 V DC

Output:

Working mode
output is triggered by an arbitrary external TTL signal
Voltage, high level
adjustable, up to 3.5 kV 1
Voltage, low level
fixed, 0 V
Pulse width
200 ns – ∞
Max. repetition rate
> 8 kHz at the full load (3.5 kV, 11 pF)
up to 30-50 kHz and higher at lower load capacitances and voltages  1, 2
Rise time (fall time)
10 ns typ. 3
Jitter
~ 2 ns typ.
Delay time
~ 150 ns typ.

Environment:

Operation temperature
+10 … +40 °C
Storage temperature
-20 … +60 °C
Humidity
0 ... 90%, non-condensing

Other:

Size (LxWxH)
140x50x20 mm
Weight
< 0.1 kg
1) these parameters aren't indepenent and cannot achieve their maximum at the same time
2) forced air cooling is required for operating with high repetition rates
3) 10-90% level, guaranteed at load capacitance 11 pF and below

Modifications

Model *
Description
QBU-mini-3514
1.4-3.5 kV high voltage adjustment range
QBU-mini-3012
1.2-3.0 kV high voltage adjustment range
QBU-mini-2008
0.8-2.0 kV high voltage adjustment range
QBU-mini-1004
0.4-1.0 kV high voltage adjustment range

(*) Other output voltages are available on request

Example

QBU-mini-3514
1.4-3.5 kV high voltage adjustment range
qbu-mini-manual-en.pdf

Download user manual (365kB)