HVR-Drive™ Pockels Cell Driver
Designed to switch Pockels cells used for pulse management in high repetition rate ultrafast laser regenerative amplifiers.Full Product Description
- Pulse amplitude:
- Min: 1.0 kV, Max: 7.5 kV
- Rise/fall time:
- Min: 10 ns, Max: 15 ns
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The HVR-Drive from G&H is designed to switch Pockels cells used for pulse management in high repetition rate ultrafast laser regenerative amplifiers. This driver has a repetition rate from 0–200 kHz, an output voltage of 0–7.5 kV, rise and fall times of 10–15 ns with pulse widths of 100 ns–5 μs. The driver produces a top-hat waveform with fast-rising and falling edges.
Heat load and space requirements are at a minimum due to the use of external power supplies and control electronics.
The HVR-Drive measures 136.5x178x70 mm (5.375x7.0x2.8”) with the standard heat sink for convection cooling. It can also be air-cooled or water-cooled for higher repetition rates.
- 0–200 kHz repetition rate pulses
- 1.0–7.5 kV output voltage
- 10–15 ns rise and fall times
- 100 ns–5 μs pulse widths
- Bipolar balanced output
|Low voltage supply||Min: 21.0 VDC, Max: 28.0 VDC|
|Low voltage supply: 200 kHz rep rate||Max: 300 mA|
|2 x high voltage supplies||Max: 200 mA (For 7.5kV out, external ± 1875 VDC required¹)|
|On/Off trigger voltage||Min: 4 V, Max: 15 V, Normally 5 V, TTL|
|Trigger to output delay (5 V trigger)||Min: 60 ns, Max: 50 ns|
|ON/OFF trigger separation (determines output pulse width)||Min: 100 ns, Max: 5000 ns|
|Trigger pulse width (Actual ON or OFF pulse)||Min: 50 ns, Max: 100 ns|
|Jitter, trigger to output||Max: 50 ps (2 ns trigger rise time)|
|Repetition rate||Max: 100 kHz (7.5 kV, 10 pF, water cooled²), Max: 150 kHz (6.0 kV, 10 pF, water cooled), Max: 200 kHz (5.0 kV, 10 pF, water cooled),|
|Duty cycle||Ratio of pulse width to period (1/frequency): 20 %|
|Pulse amplitude||Min: 1.0 kV, Max: 7.5 kV|
|Rise/fall time||Min: 10 ns, Max: 15 ns|
|Operating ambient||Min: 0 °C, Max: 50 °C|
Two external high voltage power supplies are required; one positive output, one negative output.
For example, to achieve 6 kV output you will need ±1500 VDC input.
¹ High voltage current requirements are determined by the pulse width and repetition rate.
Rise and fall times vary with output voltage and rep rate; higher voltages produce longer rise and fall times.
² Convection cooled, the maximum rep rate is 25 kHz @ 7.5 kV, 37.5 kHz @ 6 kV and 50 kHz @ 5 kV.
Water cooled with optional cold plate. Chiller set to 24°C, flow rate to 1.0 gal/minute (4 liter/min) nominal.
Do not connect the outputs to ground or damage to the driver will occur.
The low voltage supply must be on before applying the high voltage inputs.
DO NOT exceed a 20% duty cycle (ratio of pulse ON time to pulse OFF time).
The On/Off triggers must not overlap or damage to the driver will occur (minimum separation is 100 ns).