Products

HVSW-04 Pockels cell driver

Pulse picker HVSW-04 Pockels cell driver

Applications

Pulse picking
Cavity dumping
Regenerative amplifier control

Features

Up to 4.0 kV output voltage
Up to 4 MHz repetition rate (at 1.4 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

Download manual (1.3 MB)

HVSW-04 pulse picker 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, pulse picking. (An example of seed laser optical sheme is here)

Using the pulse picker 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). User has a possibility to adjust an output voltage level by using an interface of the HV DC power supply.

The maximum output voltage is 4 kV (bipolar), maximum 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

< 400

2.0

< 300

1.6

< 300

1.4

< 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.

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All-in-one driver	Pulse picker module set	GaN driver

Input:

LV input

+24 V DC, 3 A max

HV input

+HV/2 to one pole; -HV/2 to the other

Output:

Output type

bipolar

Pulse basement¹

0V, fixed

Pulse amplitude^{1, 2}

0-4 kV (the same as voltage, applied to HV Input)

Maximum repetition rate²

up to 4 MHz

Minimum repetition rate

single shot (there is an internal restriking circuit which makes the operations at such a low repetition rate possible)

Pulse width³
– in fixed pulse width mode

– in variable pulse width mode

15-20 ns, fixed
15-2000 ns or 100-2000 ns, adjustable
See also User manual

Interpulse interval

> 50 ns

Rise/fall time⁴

from 5-7 ns at output voltages ~1 kV
to 9-11 ns at the max. voltage (4 kV)

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

– 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

HVSW-04-XXX-[WR]-[FX], where:

XXX means voltage modification, might be either 4kV (most standard version) or 2kV (high repetition rate version)
WR means wide (15-2000ns) pulse width adjustment range (option, please see Manual, p. 11-13 for the details)
FX means version of the device with fixed polarity of the output pulses (option, please see Manual, p. 11-13 for the details)

Difference between 2kV and 4kV modifications:

Modification	Maximum repetition rate	Maximum voltage	Rise time / fall time
HVSW-04-4kV-[WR]-[FX] (standard modification, 4kV max)	1MHz (can be damaged if operated at higher repetition rate)	4kV (can be damaged if operated at higher voltage)	9-11ns (at 4kV)
HVSW-04-2kV-[WR]-[FX] (high repetition rate modification, 2kV max)	4MHz (can be damaged if operated at higher repetition rate)	2kV (can be damaged if operated at higher voltage)	7-9ns (at 2kV)

Modifications

Model

Description

HVSW-04-4kV

Base version (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
Polarity of sequential pulses – alternating

HVSW-04-2kV

High repetition rate version (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
Polarity of sequential pulses – alternating

HVSW-04-4kV-FX

Version with fixed polarity of the output pulses (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
–
Polarity of sequential pulses – the same

HVSW-04-2kV-FX

High repetition rate version with fixed polarity of the output pulses (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
Polarity of sequential pulses – the same

HVSW-04-4kV-WR

4kV base version with wide pulse width adjustment 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
Polarity of sequential pulses – alternating

HVSW-04-2kV-WR

High repetition rate version with wide pulse width adjustment range (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)
Continuously adjustable pulse width in 15-2000 ns range
Polarity of sequential pulses – alternating

HVSW-04-4kV-WR-FX

4kV base version with wide pulse width adjustment range and fixed polarity of the output pulses:

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
Polarity of sequential pulses – the same

HVSW-04-2kV-WR-FX

High repetition rate version with wide pulse width adjustment range and fixed polarity of the output pulses (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)
Continuously adjustable pulse width in 15-2000 ns range
Polarity of sequential pulses – the same

Example

HVSW-04-4kV-FX

Up to 4.0 kV output voltage, up to 1 MHz repetition rate, fixed polarity of the output pulses

HVSW-04 Pockels cell driver

Applications

Features

You may also be interested in:

Input:

Output:

Environment:

Other:

Difference between 2kV and 4kV modifications:

Modifications

Example

Resources