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HVSW-04 Pockels cell driver

Applications

  • Pulse picking
  • Cavity damping
  • Regenerative amplifier control

Features

  • Up to 4.0 kV output voltage
  • Up to 4 MHz repetition rate (at 1.6 kV voltage)
  • Up to 1 MHz repetition rate (at 3.2 kV voltage)
  • 5-11 ns rise / fall time
  • Requires external HV power supply (e.g. HVPS-300)
  • Two possible operating modes for base model: short pulse (15-20 ns, fixed width) and long pulse (100-2000 ns, adjustable width)
    15-2000 ns pulses for wide range modification
hvsw-04-manual-en.pdf

Download user manual (1.0Mb)

HVSW-04 is a dedicated high voltage high repetition rate Pockels cell driver for pico- and femtosecond lasers. It represents a combination of two fast drivers (based on MOSFET technology) in a full-bridge schema, the primary use is for extracting single pulses from a pulse train.

pp-150.gif

Using the driver one chooses between two operation modes:

  • fixed width short pulses (about 15-20 ns), triggered by a leading edge of an external TTL.
  • variable width long pulses (adjusted in range of 100-2000 ns typically, other on request), when a leading edge of an external TTL signal cause rise of pulse, and a trailing edge cause pulse fall.
We offer also a wide range driver modification with a continiously adjustable in range of 15-2000 ns pulse width.

The driver requires +24 V DC power supply, a pulse generator to set an operating frequency and pulse width (in variable pulse width mode) and a HV DC bipolar power supply (e.g. HVPS-300). An output voltage level is set by user using an interface of the HV DC power supply.

The maximal output voltage is 4 kV (bipolar), maximal repetition rate is 0.5-4 MHz (in dependence on output voltage, some target performances are given in the following table):

Output voltage, kV
Repetition rate, MHz (*)
Power consumption, W
4.0
0.5
< 300
3.2
1
< 400
2.0
2
< 300
1.6
3
< 300
1.4
4
< 350
(*)The values are approximate, exact performance depends on actual load capacitance and cooling conditions.

Please, note that by bipolar device an output pulse voltage U is formed by applying +U/2 to one output wire and –U/2 to other one. Therefore, both output poles are under HV.
Driver is water cooled.

It is possible to control the driver through analogue interface or through RS-485 interface (not simultaneously!). PC software is available for lab purposes.

screen1.jpg


Input:

LV input
+24 V DC, 2.5 A max
HV input
+HV/2 to one pole; -HV/2 to another pole

Output:

Output type
bipolar
Voltage amplitude
regulated, up to 4 kV 1, 2
Voltage basement
fixed, 0 V 1
Maximal repetition rate
up to 4 MHz 2
Minimal repetition rate
single shot
Pulse width
- in fixed pulse width mode

- in variable pulse width mode

15-20 ns, fixed

15-2000 ns or 100-2000 ns, adjustable 3 See also User manual
Interpulse interval
> 50 ns
Rise/fall time
from 5-7 ns at output voltages ~1 kV
to 9-11 ns at the max. voltage (4 kV) 4
Delay time
< 50 ns
Jitter
< 0.5 ns (+/- 250 ps)
Load capacitance
typ. 5-7 pF

Environment:

Operation temperature
+10 … +40 °C
Storage temperature
-20 … +60 °C
Humidity
0 … 90%, non-condensing

Other:

Protection
- from too long pulses (gate limit), adjusted by the customer in 200 ns to 2000 ns range 3
- from overheating
Size (LxWxH)
176x69x50 mm
Weight
< 0.5 kg
1) In terms of bipolar output
2) these parameters aren't indepenent and cannot achieve their maximum at the same time
3) these and other parameters might be changed upon request
4) 10-90% level, guaranteed at load capacitance 5-7 pF and below

Modifications

Model
Description
HVSW-04 or
HVSW-04-4kV
  • Up to 4.0 kV output voltage
  • Up to 1 MHz repetition rate (at 3.2 kV voltage)
  • 9-11 ns rise / fall time (at 4 kV voltage)
  • Short pulse (15-20 ns, fixed) and Long pulse (100-2000 ns, adjustable) modes of operations, 20-100 ns range is unavailable
HVSW-04-2kV
  • Up to 2.0 kV output voltage
  • Up to 4 MHz repetition rate (at 1.6 kV voltage)
  • 7-9 ns rise / fall time (at 2 kV voltage)
  • Short pulse (15-20 ns, fixed) and Long pulse (100-2000 ns, adjustable) modes of operations, 20-100 ns range is unavailable
HVSW-04-4kV-WR
(wide range)
  • Up to 4.0 kV output voltage
  • Up to 1 MHz repetition rate (at 3.2 kV voltage)
  • 9-11 ns rise / fall time (at 4 kV voltage)
  • Continuously adjustable pulse width in 15-2000 ns range
HVSW-04-2kV-WR
(wide range)
  • Up to 2.0 kV output voltage
  • Up to 4 MHz repetition rate (at 1.6 kV voltage)
  • 7-9 ns rise / fall time (at 2 kV voltage)
  • Continuously adjustable pulse width in 15-2000 ns range

Example

HVSW-04
Up to 4.0 kV output voltage, up to 1 MHz repetition rate
hvsw-04-manual-en.pdf

Download user manual (1.0Mb)

hvps-300-manual-en.pdf

Download user manual for suggested high voltage power supply (1.5Mb)