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Home Electro-optics MOSFET-based Pockels Cell Drivers Bench-top Pockels Cell Drivers QBU-BT-series Pockels Cell Drivers

QBU-BT-series Pockels Cell Drivers

QBU-BT-series is a series of bench-top (table-top) Pockels cell drivers designed for the laboratory use and based on OEM Pockels Cell Drivers of QBU-series. Key parameters/features are:

  • Extremely flexible topology;
  • Push-up scheme, pull-down scheme, mixed or user-defined in one module (duplicates at its HV output the external driving TTL signal);
  • Up to 6 kV output voltage;
  • Up to 100 kHz and higher repetition rate;
  • < 20 nsec rise/fall time;
  • Perfectly suitable for the laboratory purposes.

Applications

  • q-switching, pulse slicing, Pulse picking, Advanced Beam Control

Description

QBU-BT-series consist of six Pockels cell drivers, designed for different output voltages (ranging up to 6.0 kV) and operating schemes [see also How to Order (?) section].

All drivers allow functionality in three different operating modes [pull down scheme (= normally on), push up scheme (= normally off) and external synchronization mode (= repetition of the external low voltage TTL signal)] and therefore suit ideally for the laboratory usage.

High repetition rates and fast transition times are additional benefits of QBU-BT-series Pockels cell drivers.

Performance

In internal synchronization mode performance of QBU-BT-series (from QBU-BT-1004 to QBU-BT-6024) is limited with values given in table below. Total load capacitance of Pockels cell and connective cable is assumed as 23 pF (this corresponds to fairly long 50 cm HV cable bent in non-optimal way and higher than normal Pockels cell capacitance).

Output voltage, kV Repetition rate, kHz (*)
0.40 – 0.79 296
0.80 – 1.19 200
1.20 – 1.39 160
1.40 – 1.59 130
1.60 – 1.79 110
1.80 – 1.99 90
2.00 – 2.49 56
2.50 – 2.99 40
3.00 – 3.49 31
3.50 – 3.99 24
4.00 – 4.49 18
4.50 – 4.99 15
5.00 – 5.49 12
5.50 – 6.00 9-11

Higher performance can be achieved in external synchronization mode. In burst mode (i.e. for short term operations), the performance increases by at least a factor of two and exceeds 100 kHz at low operating voltages and low load capacitances. The performance deteriorates for higher load capacitance.

Technical Specifications

INPUT
Voltage 10/230 VAC, 50/60 Hz
Current Consumption <1 A
OUTPUT
Modifications by operational modes Pull-down (= normally on), or Push-up (= normally off), repetition of TTL signal
Synchronization Internal and External
Voltage, high level/low level Adjustable, up to 6 kV1/fixed, 0 V
Rise time (fall time) <20 nsec (<20 nsec)2
Pulse width 1 µsec – 1 sec (in internal synch. mode)
200 nsec – DC (in external synch. mode)
Pulse Repetition Rate up to 50 kHz (CW), up to 100 kHz (burst-mode)1
Timing Jitter 10 nsec (1 nsec in LJ-modification)
Delay Time 1 µsec (100 nsec in LJ-modification)
Load Capacitance up to 0.5 nF1
ENVIRONMENT
Operational Temperature 0…+40°C
Storage temperature -20…+60°C
Humidity 90%, non-condensing
PHYSICAL
Exterior Dimensions (LxWxH) 225 x 200 x 60 mm
Weight <2 kG

1) These parameters aren’t independent, and cannot achieve their maximum at the same time
2) 10-90% level, warranted for a load capacitance of 11 pF and below

How to Order

Pull-down (normally on) modifications:
Model* Description
QBU-BT-6024 2.4-6.0 kV high voltage adjustment range
QBU-BT-5020 2.0-5.0 kV high voltage adjustment range
QBU-BT-4016 1.6-4.0 kV high voltage adjustment range
QBU-BT-3012 1.2-3.0 kV high voltage adjustment range
QBU-BT-2008 0.8-2.0 kV high voltage adjustment range
QBU-BT-1004 0.4-1.0 kV high voltage adjustment range
(*) Other output voltages are available on request

Other options:
-LJ Low-Jitter Option
 
Example:
QBU-BT-5020-LJ 2.0-5.0 kV high voltage adjustment range. Low jitter option

Downloads

QBU-BT series Pockels cell driver - User Manual
QBU-BT-manual-en.pdf (1 MB)