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STGH Q-DRIVETM 551 POCKELS CELL DRIVER

The Gooch & Housego Q-DriverTM is designed for use in product development, teaching and research laboratories. The unit is ideal for evaluating G&H’s OEM driver technology as both drivers share the same electronic design.

Housed in a compact 100x125x50 mm (5x5x2”) aluminium case, the driver has a full suite of controls, indicators and remote control features. It operates form an external 24VDC source (power adapter included).

A unique feature of the driver is its differential bipolar output-reducing voltage to ground and shock hazard, as important feature in a laboratory environment. Leads to the pockels cell leave from the back of the case, keeping them away from hands at the front panel. The driver outputs are short-circuit proof.

The driver is designed for reliability with low component stresses, the highest quality components and the use of US Navy derating standard.

An OEM version with the same electrical performance is available for inclusion in the laser product.

 

Features:

·    4-7ns, 1.5-4.5kV, 1Hz-4.5KHz performance

·    50 ohm isolated trigger

·    Front panel controls for high voltage setpoint and power

·    DB-9 connector with: voltage monitor, remote setpoint, voltage on/off

·    Status LEDs for power, high voltage and trigger

 

Benefits

·    Front panel or remote control

·    Short-circuit protected output

·    Easy integration of OEM version

·    EM shielding enclosure

 

Applications

·    Ideal for development of Q-switched lasers for:

-     Medical and dermatology

-     Imaging

-     Engraving

-     Metal cutting

-     Microfabrication

-     Range finding

-     Holography

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Pulse top

4kV output, 6pF cell capacitance

 

150 (nom)

ns

Delay time constant

4kV output, 6pF cell capacitance

 

5 (nom)

μ

Pulse voltage

Limits of adjustment

1.5

4.5

kV

Load capacitance

 

 

25

pF

POWER REQUIREMENTS

24 VDC

Power limit before output fold-back

 

130

mA

TRIGGER

Trigger voltage

 

2

8

V

Input Impedance

 

48

52

ohms

Pulse width

 

200

 

ns

Jitter, trigger to output

2ns trigger rise time, Tektronix 11801

 

20 (nom)

Ps RMS

ENVIRONMENTAL

Temperature

 

-20

50

°C

 

Typical performance

Complimentary ± output

Risetime -4kV, 10 pF

 

 

 

 

STGH  Q-DRIVETM OEM POCKELS CELL DRIVER

The Gooch & Housego OEM Q-DriveTM is a cost effective, high performance Pockels cell driver for incorporation into Q-switched laser systems.

The driver is packaged on a compact 100x83 mm (4x3¼") circuit board. The driver is fully self-contained with the power supply and all control circuitry, needing only 24 VDC and a trigger signal to operate.

Designed for reliability with low component stress and worst-case design margins, the driver meets specifications from 40C to +70C. It works with loads to 50 pF.

G&H can supply the driver in different form factors for high volume applications. For more information please see the Design-In Manual.

 

Features

·    4-7 ns, 1.5-4.5 kV, 1Hz-4.5 kHz performance (see graph on following page)

·    50 ohm isolated trigger

·    Voltage monitor

·    Status LEDs for power, high voltage and trigger

·    Remote on/off and voltage setpoint

·    Bipolar balanced output

·    24 VDC input power

·    Laboratory version available

 

Benefits

·    Low power dissipation, less heat

·    Remote control ready

·    Compact footprint

·    Easy integration

 

Applications

·    Medical and dermatological laser systems

·    Imaging

·    Engraving

·    Metal cutting

·    Microfabrication

·    Range finding

·    Holography

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Pulse top

4kV output, 6pF cell capacitance

 

150 (nom)

ns

Delay time constant

4kV output, 6pF cell capacitance

 

5 (nom)

μ

Pulse voltage

Limits of adjustment

1.5

4.5

kV

Load capacitance

 

 

25

pF

POWER REQUIREMENTS

24 VDC

Power limit before output fold-back

 

130

mA

TRIGGER

Trigger voltage

 

2

8

V

Input Impedance

 

48

52

ohms

Pulse width

 

200

 

ns

Jitter, trigger to output

2ns trigger rise time, Tektronix 11801

 

20 (nom)

Ps RMS

ENVIRONMENTAL

Temperature

 

-20

50

°C

 

Typical performance

Complimentary ± output

Risetime -4kV, 10 pF

 

 

 

 

Layout

Dimensions of the driver board.

 

STGH R200TM OEM POCKELS CELL DRIVER

The Gooch & Housego R200TM is a compact OEM Pockels cell driver for inclusion in regenerative amplifiers and other pulse selection applications in solid state laser systems.

The unit drives Pockels cells at 1/4 wave producing pulses at up to 2.5 kV and up to 200 kHz, with burst mode capability to 1 MHz. The driver produces a top-hat waveform with fast rising and falling edges.

Heat load and space requirements are kept at a minimum due to the use of external power supplies.

The trigger input is also electrically isolated from the power supplies for safety.

The compact 115x90x30 mm (4.5x3.5x1.2") circuit board is supplied on an aluminum plate for convection cooling, which can also be attached to a cold plate for water cooling.

The R200 can also be supplied as a turn-key integrated 19” rack system for bench top use.

 

Key Features

·    4-7 ns rise and fall time

·    0-2.5 kV output voltage

·    0-200 kHz repetition rate

·    250 ns 3 s pulse widths

·    Bipolar balanced output

 

Benefits

·    Available as a turn-key system with enclosure

·    High performance at a low cost

·    Can be air or water cooled

·    Compact footprint

 

Applications

·    Metal cutting

·    Welding

·    Glass and sapphire cutting

·    Spectroscopy

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Pulse repetition rate 

Convection cooled

0

40

kHz

Water cooled 1.5 L/min.

40

200

kHz

Pulse voltage

External HV: ±625 VDC in for 2.5kV out

0

2.5

kV

Pulse width

Same as trigger input

250

3,000

ns

Rise, fall times

2.0 kV, 6 pF

 

6.0

ns

2.0 kV, 40 pF max load

 

9.5

ns

POWER REQUIREMENTS

Input voltage, current

24 VDC (± 2 VDC)

 

200

mA

High voltage, current

2.5 kV out, ±625 VDC in, 200 kHz, 6 pF

 

55

mA

TRIGGER

Trigger amplitude Input

Nom. 5 V, 50Ω Impedance

4

10

V

Trigger to output delay

5 V trigger

 

40

ns

Trigger pulse width

Sets output pulse width

250

3,000

ns

Jitter, trigger to output

2 ns trigger rise time, Tektronix 11801

 

20 nom

ps RMS

ENVIRONMENTAL

Mounting surface*

 

 

50

°C

*Mounting plate should be attached to a thermally conductive surface for cooling or to a cold plate for water cooling.

 

 

Layout

Dimensions of the driver board with integral mounting plate.

 

STGH QDP-50TM OEM POCKELS CELL DRIVER

The Gooch & Housego QDP-50TM is a compact OEM Pockels cell driver for inclusion in flash lamp pumped lasers.

The driver is designed for Q-switching of lasers without the need for phase retardation plates. Once triggered, high voltage is applied to inhibit the laser output. After a preset delay, the Pockels cell is opened by a fast negative pulse to allow laser output, then it returns to high voltage to inhibit additional lasing.

The QDP-50 has been shown to increase Pockels cell life expectancy and laser output power relative to voltage-on scenarios often employed.

It can be triggered via an SMA connector or via an optional optical input for greater noise immunity.

The compact 140x92x32 mm (5.5x3.6x1.2") circuit features an integrated high voltage power supply which includes remote voltage monitoring (1 V/kV) and remote shutdown.

 

Key Features

·    1.2-4.0 kV adjustable output voltage

·    0-50 Hz repetition rate

·    400 μs nominal on time (adjustable)

·    160-200 μs delayed pulse (adjustable)

·    Fall time (delay pulse) less than 10 ns

·    SMA trigger input standard

·    Optical trigger input (optional)

 

Benefits

·    Increased Pockels cell life

·    High performance at a low cost

·    Integrated high voltage power supply

·    Compact footprint

 

Applications

·    Medical lasers

·    Industrial lasers

·    Etching/marking

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Pulse repetition rate

Same as trigger input

1

50

Hz

Amplitude (V1+V2)

Adjustable (V2 = 10% of V1)

1.2

4.0

kV

Total HV on time

Adjustable or fixed

300

600

μs

Delayed center pulse

Adjustable (range can be modified)

160

200

μs

Rise time

3.5 kV, 6 pF

1

5

μs

Fall time

3.5 kV, 6 pF

 

< 10

ns

Load capacitance

With Pockels cell leads

 

30

pF

POWER REQUIREMENTS

Input voltage

Exceeding 20 VDC will damage driver

15

18

VDC

Input current

4.0 kV, 50 Hz, 10pf load

 

250

mA

TRIGGER

Input impedance

Nom. 50 Ω

48

52

ohms

Amplitude

Nom. 5 V

4

10

V

Pulse width

Set by user

100n

10m

sec

Propagation delay

After trailing edge of trigger

80

100

ns

ENVIRONMENTAL

Ambient air temperature

 

 

50

°C

 

Mechanical Drawing

 

STGH HVR-DRIVETM POCKELS CELL DRIVER

The HVR-DriveTM from Gooch & Housego is designed to switch Pockels cells used for pulse management in high repetition rate ultrafast laser regenerative amplifiers.

The HVR-Drive can drive Pockels cells at 1/4 λ or 1/2 λ up to 7.5 kV and up to 200 kHz. 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-DriveTM 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.

G&H can supply the driver in different form factors for high volume applications. On/Off trigger inputs can be standard TTL signals or optional optical trigger inputs can be supplied.

We can work with you to customize the driver for your specific application. Options such as remote monitoring, remote shutdown and over temperature indicators can be supplied.

 

Key Features

·    0 200 kHz repetition rate pulses

·    1.0 7.5 kV output voltage

·    10 15 ns rise and fall times

·    250 ns 3 μs pulse widths

·    Bipolar balanced output

 

Key Benefits

·    Compact footprint

·    Reduced heat load

·    Easy integration

·    Flexible design

 

Applications

·    Metal cutting

·    Welding

·    Glass cutting

·    Sapphire cutting

·    Spectroscopy

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Repetition rate 

7.5 kV, 10 pF, water cooled2

 

100

kHz

6.0 kV, 10 pF, water cooled

 

150

kHz

5.0 kV, 10 pF, water cooled

 

200

kHz

Duty cycle

Ratio of pulse width to period (1/frequency)

 

20

%

Pulse amplitude

 

1.0

7.5

kV

Rise/fall times

 

10

15

ns

POWER REQUIREMENTS

Low voltage supply

 

15.0

18.0

VDC

Low voltage supply

200 kHz rep rate

 

300

mA

2 x high voltage supplies

For 7.5kV out, external ± 1875 VDC required1

 

100

mA

TRIGGER

On/Off trigger voltage

Normally 5 V, TTL

4

15

V

Trigger to output delay

5 V trigger

 

60

ns

Pulse width

(subject to 20% duty cycle maximum)

250

3000

ns

Jitter, trigger to output

2 ns trigger rise time

 

50

ps

ENVIRONMENTAL

Operating ambient

 

0

50

°C

 

NOTES

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; 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, chiller set to 24°C, flow rate to 1.5 gal/minute (6L/min) nominal.

 

CAUTIONS

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.

The On/Off triggers must not overlap or damage to the driver will occur.

 

STGH HVR-SYSTEMTM

The HVR-SystemTM from Gooch & Housego is a turn-key integrated driver and control system to switch Pockels cells used for pulse management in high repetition rate ultrafast laser regenerative amplifiers.

The HVR-SystemTM can drive Pockels cells at 1/4λ or 1/2λ up to 7.5kV and up to 200 kHz. The driver produces a top-hat waveform with fast rising and falling edges. The HVR-SystemTM operated from any 88-264VAC, 50-60Hz input, it requires only an AC source and a TTL signal to operate.

A built-in digital voltmeter allows you to set the output voltage before applying it to the driver and separate high voltage enable/disable buttons are standard for added safety. A separate trigger on/off switch provides easy pulse control which also disables the high voltage at the rear panel output connectors.

The HVR-SystemTM comes in a standard 483mm (19”) rack mount enclosure which can also be used as a benchtop unit. It comes with forced air cooling for operation up to 50 kHz or water-cooled for higher repetition rates.

We can work with you to customize the system for your specific application. Option such as optical triggering, remote control and over-temperature indicators can be supplied.

 

Key Features

·    0-50 kHz repetition rate (air-cooled)

·    0-200 kHz repetition rate (water-cooled)

·    1.0-7.5 kV output voltage

·    10-15 ns rise and fall times

·    250 ns-3 us pulse widths

·    Bipolar balanced output

·    Standard 483mm (19”) rack mounting

·    Dimensions: 432x381x95.25mm (17x15x3.75”)

 

Key Benefits

·    Turn-key driver solution

·    Built in digital voltmeter

·    Easy integration

·    Flexible design

 

Applications

·    Metal cutting

·    Welding

·    Glass cutting

·    Sapphire cutting

·    Spectroscopy

 

Specifications

Parameter

Conditions

Min

Max

Units

OUTPUT PULSE PARAMETERS

Max pulse repetition rate

Air cooled

 

50

kHz

 

Water cooled

 

200

kHz

Max duty cycle

Ratio if pulse width to period (1/freq)

 

20

%

Pulse amplitude

 

1.0

7.5

kV

Rise/fall times

6-10 pF output capacitance1

10

15

ns

POWER REQUIREMENTS

Input voltage

 

88

264

mA

Input frequency

 

50

60

Hz

TRIGGER

Voltage

Normally 5 V, 50 Ω input impedance

4

6

V

Trigger to output delay

5 V trigger

 

100

ns

Pulse width

(subject to 20% duty cycle maximum)

250

3000

ns

ENVIRONMENTAL

Operating ambient

 

0

40

°C

1 Unit has been tested with up to a 100 pF load and demonstrated rise/fall times less than 40 ns

 

Standard Output Configurations

Amplitude

Maximum rep rate

Model number

Cooling method

0-6 kV

10 kHz

HVR-60010

Air

0-6 kV

30 kHz

HVR-60030

Air

0-6 kV

150 kHz

HVR-60150

Water

0-7.5 kV

5 kHz

HVR-75005

Air

0-7.5 kV

10 kHz (0-6 kV @ 20 kHz

HVR-75010

Air

0-7.5 kV

100 kHz (0-5 kV @ 20 kHz

HVR-75100

Water

 

STHVSW03-OEM Drivers

HVSW03 is a specialized Pockels cell driver that performance is optimized for pico- and femtosecond lasers. Main applications are pulse picking and regenerative amplifier control.

Maximal output voltage is 2kV; maximal repetition rate achieves 1MHz at 1.5kV output voltage and 2MHz at <1.0kV output voltage.

Transition times are as fast as 5-7ns in dependence on load capacitance and driver’s configuration. Pulse width is <15ns (fixed), then 100-2000ns (adjustable by the customer).

Interfaces are analogue and RS-485. Configuration software for Windows® 7 is available.

Compact design (about 0.3dm3), conductive cooling through the bottom surface and embedded high voltage power supply (i.e. driver’s input is +24V DC) are additional benefits.

 

Specifications

Input

+24V DC; 5.5A max

Output

Pulses of high voltage and high repetition rate

delivered to the capacitive load (e.g. to the Pockels cell)

Output type

Bipolar

Pulse basement 1

0V, fixed

Pulse amplitude 1, 2

adjustable in 0-2kV range

Maximal repetition rate 2

Up to 1-2MHz (see also Performance section)

Minimal repetition rate

Single shot (there is an internal re-striking circuit

which makes the operations at such a low repetition rate possible)

Pulse width

-     Fixed, about 15ns in Fixed pulse width mode

-     100ns-2000ns adjustable (customable) in Variable pulse width mode

Interpulse interval

>100ns

Risetime / falltime 3

5-7ns

Delay time

<50ns

Jitter

<0.5ns (±250ps)

Load capacitance

5-7pF typically

Protections

-   From too long pulses (Gate limit), adjusted by the customer in 200ns to 2200ns range3

-   From overheating

Operation temperature

10 ~ 40°C

Storage temperature

-20 ~ +60 °C

Humidity

90%, non-condensing

Dimension

69x60x32mm

Weight

<0.5kg

1.   In terms of bipolar output (see also Technical notes section)

2.   Maximal pulse repetition rate depends on pulse amplitude, pulse amplitude and pulse repetition rate cannot achieve their maximums at the same time

3.   10-90% level, warranted at load capacitance 11pF and below

4.   These and other parameters might be changed upon request
 

Dimension

 

Performance

Driver’s performance (i.e. the maximal possible repetition rate) depends on load capacitance, pulse amplitude and the performance of cooling system and limited with internal temperature (we do not recommend to exceed 80-90 °C transistor temperature) and the current consumption (we do not recommend to exceed 5A current consumption).

Pulse width mode - variable

Pulse width mode - fixed

 

 

Triggering - soft

Triggering - harsh

 

STHVSW04-OEM Drivers

 

HVSW-04 is a specialized Pockels cell driver that performance is optimized for pico- and femtosecond lasers. Main applications are pulse picking and regenerative amplifier control.

Maximal output voltage is 4kV; maximal repetition rate is 4MHz at approx. 1.6kV output voltage and 1MHz at approx. 3.2kV output voltage. Target performance is as below:

    1.6kV, 4MHz, <300W power consumption

    3.2kV, 1MHz, <300W power consumption

Transition times are as fast as 5-7ns in dependence on load capacitance and driver’s configuration. Pulse width is <15ns (fixed), then 100-2000ns (adjustable by the customer).

For operations the driver needs both HV and LV power. HV DC input should be bi-polar. LV power is 24VDC, <2A. Module is water cooled. Different configurations of water inlets available on request.

Interfaces are analogue and RS-485. Configuration software for Windows® 7 is available.

 

Specifications

LV input

+24V DC; 1.5A max

HV input

+HV/2 by one wire; -HV/2 by another wire

Output

Pulses of high voltage and high repetition rate delivered to the capacitive load (e.g. to the Pockels cell)

Output type

Bipolar

Pulse basement 1

0V, fixed

Pulse amplitude 1, 2

adjustable in 0-4kV range

Maximal repetition rate 2

Up to 4MHz

Minimal repetition rate

Single shot (there is an internal re-striking circuit which makes the operations at such a low repetition rate possible)

Pulse width

-     Fixed, about 15ns in Fixed pulse width mode

-     100ns-2000ns adjustable (customable) in Variable pulse width mode

Interpulse interval

>100ns

Risetime / falltime 3

5-7ns

Delay time

<50ns

Jitter

<0.5ns (±250ps)

Load capacitance

5-7pF typically

Protections

-   From too long pulses (Gate limit), adjusted by the customer in 200ns to 2200ns range3

-   From overheating

Operation temperature

10 ~ 40°C

Storage temperature

-20 ~ +60 °C

Humidity

90%, non-condensing

Dimension

69x60x32mm

Weight

<0,5kg

1.   In terms of bipolar output (see also Technical notes section)

2.   Maximal pulse repetition rate depends on pulse amplitude, pulse amplitude and pulse repetition rate cannot achieve their maximums at the same time

3.   10-90% level, warranted at load capacitance 11pF and below

4.   These and other parameters might be changed upon request
 

Dimension

 

 STQBD Series OEM Drivers
 

STQBD is the series of high repetition rate Pockels cell drivers allowing simple and reliable operation of Q-witched lasers. Devices provide wide range of output direct voltages (up to 6 kV). It allows operation with Pockels cells assembled on different electrooptical crystals from low quarter-wave voltage Lithium Niobate and BBO to DKDP that requires much higher voltage levels for proper operation. STQBD-series Pockels Cell Drivers have modifications both for pull-up and pull down schemes.

 

STQBD-Series devices provide high repetition rates (up to 100 kHz) that makes them a good solution for electro-optical Q-switched lasers with CW pumping. On the other hand a short rising (falling) time allows operation in short pulsed systems with high peak output power and energy (flashlamp-pumped Nd:YAG lasers).

 

Another advantage is the ability of operation with extremely high loads (up to 0.5 nF). This feature leads to higher reliability of the device and permits remote operation of Pockels cell in laser head that can be connected to driver using long cables (correct and effective operation has been approved with cables up to 3 meters). This allows the designing of Q-switched laser systems with compact remote laser heads where close placement of Pockels cell and driver is impossible because of volume insufficiency or other causes.

 

Features

l         Compact OEM design

l         Up to 6 kV output voltage

l         Long cable operation

l         Up to 100 kHz repetition rate

l         Up to 0.5 nF load

l         Pull-up and pull-down scheme modifications

 

Specifications

Input:

 

Voltage

+24VDC

Output:

 

Voltage

up to 6 kV

Repetition Rate

from single pulse to 100 kHz

Load

up to 0.5 nF

Rise time (Fall time)

20 ns

Recovery Time

10 us

 

(depends on load, @ 100 pF)

Safety:

 

Leakage Current

not more than 150 uA

Environment:

 

Operation Temperature

-20…+45 C

Storage Temperature

-40…+85 C

Humidity

90%, non-condensing

Size (LxWxH)

110x80x25 mm

Weight

0.1 kg

Options

Harsh environment version

 

Part Number Description:                                                

STQBD-XXYY-ZZ

       STQBD – STQBD series EO Q-switch driver

       XX – maximum output voltage from 20 to 60 (2 - 6kV)

       YY – minimum output voltage from 12 to 20 (1.2 – 2.0kV)

       ZZ – UP: modification for pull-up scheme; DN: modification for pull-down scheme

 

                                                                                               Output Waveform

We offer five standard solutions:

STQBD-6024-UP/DN

STQBD-5020-UP/DN

STQBD-4016-UP/DN

STQBD-3012-UP/DN

STQBD-2008-UP/DN

 

Options

 

Adjustment range of output voltage (see figure) can be selected within the following model series: STQBD-6024 (2.4-6 kV), STQBD-5020 (2-5 kV), STQBD-4016 (1.6-4 kV), STQBD-3012 (1.2-3 kV), STQBD-2008 (0.8- 2 kV).

 

STQDB-series Pockels cell drivers have two modifications: working by pull-up scheme or working by pull-down scheme.

 

Most of time gate is retained under voltage that is indicated in grey on figure; time of rapid growth/slump (20 ns) is indicated in red; time of relatively slow recovery (~10 us) is indicated in blue. Adjustable voltage level is designated by the arrow.

 

Applications

 

STQBD-Series Pockels Cell Drivers are available in standard and special versions. Standard modification is a relatively simple OEM device designated for operation in laboratory or medical laser systems at normal temperature and humidity conditions. These modules are designed in accordance with IEC60601-1 medical safety standard requirements. Output parameters (direct high voltage) are controlled by use of analog interface.

 

Special version is available for laser systems designated for operation in harsh environment. These devices are distinguished due to wide operation temperature range, humidity and vibration steadiness. In this version all parameters are controlled by simple and reliable internal multi-turn trimpots.

 
 STQBU Series OEM Drivers
 

 STQBU is a series of multi-functional Pockels cell drivers of hi-end class. In contrast to analogues, they can provide rapid switching of input voltage in two directions: both up and down. STQBU-Series Pockels Cell Driver is extremely flexible solution for driving of the Pockels cell that works upon any user-defined scheme (that may be pull-up, pull-down schemes or any combinations of them).

 

Modules provide wide range of output direct voltages (up to 5kV). It allows operation with Pockels cells assembled on different electrooptical crystals from low quarter-wave voltage Lithium Niobate and BBO to DKDP that requires much higher voltage levels for proper operation.

 

Moreover, STQBU-Series modules provide high repetition rates (up to 100kHz) that makes them a good solution for electro-optical Q-switched lasers with CW pumping. On the other hand a short rising (falling) time allows operation in short-pulsed systems with high peak output power and energy (flashlamp pumped Nd:YAG lasers).

 

Another advantage of STQBD-series drivers is an ability of handling with extremely high loads (up to 0.5 nF). This feature leads to higher reliability of the device and permits remote operation of Pockels cell in laser head that can be connected to driver using long cables (correct and effective operation has been approved with cables up to 3 meters). This allows the designing of Q-switched laser systems with compact remote laser heads where close placement of Pockels cell and driver is impossible because of volume insufficiency or other causes.

 

Features

 

l         Extremely flexible solution

l         Pull-up and pull-down schemes

l         Up to 5 kV output voltage

l         Up to 0.5 nF load

l         Compact OEM design

l         Long cable operation

l         Up to 100 kHz repetition rate

 

Specifications

Input:

 

Voltage

+24VDC

Output:

 

Voltage

up to 5 kV

Repetition Rate

from single pulse to 100

Load

up to 0.5 nF

Rise time (Fall time)

20 ns

Recovery Time

10 us

 

(depends on load, @ 100

Safety:

 

Leakage Current

not more than 150 uA

Environment:

 

Operation Temperature

-20…+45 C

Storage Temperature

-40…+85 C

Humidity

90%, non-condensing

Size (LxWxH)

130x80x20 mm

Weight

0.1 kg

Options

Harsh environment version

 

Part Number Description:                                                   

STQBU-XXYY

       STQBU – STQBU series EO Q-switch driver

       XX – maximum output voltage from 20 to 50 (2 - 5kV)

       YY – minimum output voltage from 12 to 20 (1.2 – 2.0kV)

                                                                                                         Output Waveform:

We offer four standard solutions:

STQBU-5020

STQBU-4016

STQBU-3012

STQBU-2008

Other output voltages from 0.8 to 6 kV are available on request

 

Options

Adjustment range of output voltage (see figure) can be selected within the following model series: STQBU-6024 (2.4-6 kV), STQBU-5020 (2-5 kV), STQBU-4016 (1.6-4 kV), STQBU-3012 (1.2-3 kV), STQBU-2008 (0.8-2 kV). Time of rapid pulse growth (20 ns) is indicated red on figure time of same rapid slump is indicated blue (20 ns). Adjustable voltage level is designated by the arrow.

 

Application

 

STQBU-Series Pockels Cell Drivers are available in standard and special versions. Standard modification is a relatively simple OEM device designated for operation in laboratory or medical laser systems at normal temperature and humidity conditions. These modules are designed in accordance with IEC60601-1 medical safety standard requirements. Output parameters (direct high voltage) are controlled by use of analog interface.

 

Special version is available for laser systems designated for operation in harsh environment. These devices are distinguished due to wide operation temperature range, humidity and vibration steadiness. In this version all parameters are controlled by simple and reliable internal multi-turn trimpots.

 

Working Scheme

 

Pockels Cell (EO Q-switch)  

Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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