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QBU-BT-10kV Pockels cell drivers

Applications

  • Q-switching
  • Pulse picking, pulse slicing

Features

  • Highly tunable device
  • Push-up, pull-down and mixed schemes in one module
  • Up to 10 kV output voltage
  • Over 5 kHz repetition rate at maximal voltage, over 50 kHz at lower voltages
  • Perfectly suits for the laboratory purposes
qbu-bt-10kv-manual-en.pdf

Download user manual (303kB)

QBU-BT-10kV is an extension of QBU-BT-series operating voltage range up to 10 kV (bipolar). High output voltage allows to use Pockels cells under half-wave voltage schemes or deal with larger crystals. 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-BT-10kV-series is specially designed to control Pockels cells by applying a fast switching high voltage. The voltage level, operating frequency and pulse width can be selected in working range by user through RS232 or through the front panel. Triggering is carried out automatically or via a signal from an external device.

Devices are encased and easy for the user to mount, they run on common 100-240 V AC 50/60 Hz, so, you don't need extra power supply for the driver.

Three different operating modes are possible:

  • push-up (= normally off scheme), when a base voltage level equals to zero, triggering is internal
  • pull-down (= normally on scheme), when pulses from base bias voltage to ground are generated, triggering is internal
  • triggering by an external low voltage arbitrary TTL signal, external synchronization mode.

The fact that the drivers have a big number of settings, allowing an output signal customization in many ways to solve wide range of tasks, makes them very suitable to use in laboratory.

output signals triggered by TTL

QBU-BT-10kV is based on MOSFET technology and offers high repetition rates and fast transition time for both pulse edges (< 20 ns / < 25 ns rise/fall time). Due to high efficiency and embedded forced air cooling multi-kilohertz operations are possible even at maximal output voltage.

Performance

In internal synchronization mode the QBU-BT-10kV performance is limited to values given in a table below. The total capacitive load of Pockels cell and connective cable is assumed to be 11 pF (this corresponds to typical Pockels cell capacitance of 5-7 pF with 30-50 cm cable).

Output voltage, kV
Repetition rate, kHz
4.00-4.99
50
5.00-5.99
30
6.00-6.99
25
7.00-7.99
20
8.00-8.99
15
9.00-9.99
10
10.0-10.0
5

Higher performance can be achieved in external synchronization mode. In burst mode (i.e. for short term operations) the performance increases at least twice and can achieve 100 kHz at low operating voltages and low load capacitances.

The performance deteriorates for higher load capacitance.

Input:

Voltage
100-240 V AC, 50/60 Hz
Current consumption
< 1 A

Output:

Working modes
pull-down scheme
push-up scheme
triggering by an arbitrary external TTL signal
Voltage, high level
adjustable in 4 – 10 kV range
Voltage, low level
fixed, 0 V
Pulse width
1 us - 1 s (in internal synchronization mode)
200 ns - ∞ (in external synchronization mode)
Max. repetition rate
> 5 kHz at the full load (10 kV, 11 pF)
> 50 kHz at lower voltages
Rise time (fall time)
< 20 ns / < 25 ns 1
Jitter
~ 1.5 ns
Delay time
~ 150 ns

Environment:

Protections
from overheating (approx. 72 °C)
Operation temperature
0 … +40 °C
Storage temperature
-20 … +60 °C
Humidity
0 ... 90%, non-condensing

Other:

Size (LxWxH)
300x220x80 mm
Weight
2 kg
1) 10-90% level, guaranteed at load capacitance 11 pF and below

Modifications

Model *
Description
QBU-BT-10kV
4.0-10.0 kV high voltage adjustment range

(*) Other output voltages are available on request

Example

QBU-BT-10kV
4.0-10.0 kV high voltage adjustment range
qbu-bt-10kv-manual-en.pdf

Download user manual (303kB)