Products

QBU-series Pockels cell driver

QBU-series Pockels cell driver
QBU-series Pockels cell driver
QBU-series Pockels cell driver
QBU-serie Pockels cell drivers up to 6 kV high adjustable
QBU-serie Pockels cell drivers up to 6 kV high adjustable
QBU-serie Pockels cell drivers up to 6 kV high adjustable

Applications

  • Advanced Q-switching
  • Beam slicing
  • Pulse picking, pulse slicing

Features

  • Triggering by an arbitrary external TTL signal output provides various operating schemes
  • Up to 6 kV output voltage
  • Up to 100 kHz repetition rate
  • about 10 ns both rise/fall time
  • Compact easy-to-built-in design

QBU-series of Pockels cell driver consists of several modules. They differ in output voltage range, max 6.0 kV bipolar (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-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.

Push-up and pull-down output signals triggered by TTL

The Pockels cell driver QBU is based on MOSFET technology and offer high repetition rates and fast transition time (< 15 ns) for both pulse edges.

Performance

The table below contains the QBU maximum repetition rate* in dependence on output voltage and cooling conditions, when total load capacitance 11pF and ambient temperature 25 °C:

Output voltage, kV

Repetition rate, kHz (conductive cooling)

Repetition rate, kHz (appropriate forced-air cooling)

2.00

>40

>115

2.50

>25

>80

3.00

>20

>60

3.50

>15

>45

4.00

>11

>35

4.50

>9

>30

5.00

>7

>25

6.00

>5

>15

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

In the burst mode (= short time operation) the performance increases approximately twice and can greatly exceed 100kHz value at low operating voltage and low load capacitance.

The performance deteriorates for higher load capacitance.

You may also be interested in:

Compact driver, up to 4 kV Encased driver Up to 10 kV output
qbu-mini q-switch Pockels cell driver qbu-bt q-switch Pockels cell driver qbu-10kV, q-switch, pulse slicing, pulse picking, Pockels cell driver

Input:

Voltage

+24 V DC

Current

0.8 A max

Output:

Working modes

output is triggered by an arbitrary external TTL signal

HV high level (pulse amplitude) 1
adjustable in range of HVMIN – HVMAX (see also How to order? section)

HV low level (pulse basement)
fixed, 0 V

Pulse width
200 ns – ∞

Maximum repetition rate 1
up to 100 kHz and higher (load and voltage dependant, see also Performance section)

Rise / fall time 2
~10 ns @ load < 11 pF

Jitter
±1 ns for LJ-modification
±10 ns for low-cost version

Delay time
<100 ns for LJ-modification
<1 us for low-cost version

Safety:

Protections
from overheating (approx. 72 °C)

Environment:

Cooling
forced air cooling at high repetition rates

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)
130x80x32 mm

Weight
0.1 kg

1) these parameters aren’t indepenent and cannot achieve their maximum at the same time
2) 10-90% level

QBU-XXYY-[ZZ], where:

  • XX codes the maximum output voltage (HVMAX, user selectable up to 6000V),
  • YY codes the minimum output voltage (HVMIN, 40% of HVMAX)
  • ZZ codes options:
    LJ – low jitter option (mandatory for 6kV modification, optional for others). In LJ version of the driver jitter is as low as ±1ns, delay time is shorter than 100ns. Without LJ option specified a low-cost version of the driver (with ±10ns jitter and <1us delay) will be supplied instead.

 

The most popular modifications


Model *


Description

QBU-6024-LJ

2.4-6.0 kV high voltage adjustment range

QBU-5020-LJ
QBU-5020

2.0-5.0 kV high voltage adjustment range

QBU-4016-LJ
QBU-4016

1.6-4.0 kV high voltage adjustment range

QBU-3012-LJ
QBU-3012

1.2-3.0 kV high voltage adjustment range

QBU-2008-LJ
QBU-2008

0.8-2.0 kV high voltage adjustment range

QBU-1004-LJ
QBU-1004

0.4-1.0 kV high voltage adjustment range

(*) Other output voltages are available on request

Example

QBU-5020-LJ

2.0-5.0 kV high voltage adjustment range

Low jitter option

qbu-manual-en.pdf

Download user manual (1.1MB)

qbu-step.zip

Download STEP model (ZIP archive, 10.6MB)