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Home Electro-optics MOSFET-based Pockels Cell Drivers Pockels Cell Driver Boards QBD-nano avalanche transistor Pockels cell driver

QBD-nano avalanche transistor Pockels cell driver

Applications

  • Cavity dumping
  • Q-switching

Features

  • Compactness (40x30x10 mm)
  • Bipolar output
  • Up to 5 kV output voltage
  • Up to 10 kHz repetition rate
  • 1-3 ns rise time

Description

QBD-nano are extremely compact Pockels cell drivers producing high voltage pulses with high repetition rates, fast rise time and adjustable pulse amplitude. Wide temperature range of operation is another important feature.

It produces an up to 5 kV bipolar output voltage. 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-nano is specially designed to control Pockels cells by applying a fast switching high voltage. The module requires +5 …+12 V DC power supply and a pulse generator to set an operating frequency. An output voltage level can be programmed in 0.8-1 UMAX range by user either manually (through onboard configuration trimpot) or automatically (applying a DC voltage between respective pins).

QBD-nano output signals

QBD-nano is based on avalanche transistors and offers fast transition time for a leading pulse edge. The recovery time by QBD-nano is relatively long (5-10 μs for the trailing pulse edge vs 1-3 ns by QBU-nano).

QBD-nano has some duration (on-time, “shelf”). It could be choosen at the time of order in 0.5-1 μs range. By default, it is 0.8-0.9 μs.

Technical Specifications

Input:

Voltage
+5…+12 V DC (+4.5…+12.5 V)
Current
max 500 mA @ 5V
max 200 mA @ 12V
Current consumption
400-420 mA @ 5 V or
160-180 mA @ 12 V in target regimes:
5 pF, 5.0 kV, 2 kHz
5 pF, 3.8 kV, 4 kHz
5 pF, 2.5 kV, 8 kHz

Output:

Type
bipolar
HV pulse amplitude
(0.80-1) UMAX adjustable
Maximum output voltage (UMAX)
Standard versions –
2500 V, 3800 V, 5000 V, other on request, see also How to order? section
Pulse-to-pulse stability
< 1%
Rise time 1
1-3 ns
On-time (“shelf”)
0.5-1.0 us (factory preset, 0.8-0.9 us by default)
Recovery time
<10 us
Delay 2
< 20 ns typ.
Jitter 2
< 0.1 ns typ.
Repetition rate 1, 3
1-10 kHz max, see also How to order? section
Load capacitance
5-7 pF recommended, 20 pF max

Environment:

Operation temperature
-40 … +65 °C

Other:

Size (LxWxH)
40x30x10 mm
Weight
0.01 kg
1) depends on load capacitance and pulse amplitude
2) depends on triggering signal parameters
3) depends on ambient temperature (maximal repetition rate is derated approximately twice at 65 ̊C ambient temperature and rises in cooler conditions)

How to Order

QBD-nano-XXYY, where:

– XX codes the maximum output voltage (UMAX)
– YY codes the maximum repetition rate (FMAX)

Voltage modifications

Model
Description
QBD-nano-5002
UOUT= 4.0 – 5.0 kV
FMAX= 2 kHz
High voltage version, 2kHz for 5pF at 5.0kV, 25 ̊C
QBD-nano-3804
UOUT= 2.8 – 3.8 kV
FMAX= 4 kHz
Base version, 4kHz for 5pF at 3.8kV, 25 ̊C
QBD-nano-2508
UOUT= 1.9 – 2.5 kV
FMAX= 8 kHz
Low voltage version, 8kHz for 5pF at 2.5kV, 25 ̊C

Other modifications are available on request.

Downloads

QBD-nano-manual-en
QBD-nano-manual-en.pdf (539 KB)