Air-Cooled Q-switches

  • Update:Apr 19, 2020
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A compact conduction-cooled acousto-optic Q-Switch for use in DPSS Nd:YAG & Nd:YVO4 lasers.The RF frequencies are 41MHz, 68MHz and 80MHz. Custom-design available upon request.

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For the information on the principle of Q-switch pulsing, please click here.

1. QS041-10G-xxyy Series Q-switches

A compact, conduction-cooled, acousto-optic Q-Switch for use in DPSS Nd:YAG & Nd:YVO4 lasers. Utilising the same manufacturing technology as our industry standard, high power QS24/27 series, these compact devices offer unrivalled reliability through superior optical quality and coatings.

Optimised for use with linearly polarised beams of up to 1.6mm diameter, offering loss modulation figures exceeding 85%. Utilising Crystal Quartz as the interaction material to give increased efficiency and high thermal transfer properties allowing use at RF powers of up to 15W, conduction-cooled.

This Q-Switch can also be customised to feature alternative frequencies, active apertures and housing designs, our team of scientists will be pleased to discuss variations with you.

Model Number QS041-10G-SO3 QS041-10G-IN2
Interaction Material Crystal Quartz
Wavelength 1047 to 1064nm
Polarisation Linear, vertical to base Linear, vertical to base
Anti-Reflection Coating < 0.2% per surface
Damage Threshold > 1GWcm2
Transmission (single pass) > 99.6%
Frequency 40.68MHz
VSWR < 1.2:1 (50Ω input impedance)
Active Aperture 1.6mm 1.8mm
Acoustic Mode Compressional
Rise-Time / Fall-Time 109ns/mm 113ns/mm
Loss Modulation > 85% > 85%
Beam Separation 7.3mrad
Acceptance Angle (full) 6.1mrad
RF Power Rating 20W CW
Cooling Conduction through base
Dimension 35x35x24mm 39.5x35x22mm
Q-switch driver R39041-20DMFPS-SC
Model No I-QS041-1.8C10G-4-GH21 I-QS041-1.6C10G-4-SO6
Device AO Q-Switch AO Q-Switch
Interaction material Crystal Quartz Crystal Quartz
Wavelength 1047 to 1064nm 1064nm
Damage threshold > 1GW/cm2 > 1GW/cm2
AR coating reflectivity < 0·2% per surface < 0·2% per surface
Transmission > 99·6% > 99·6%
Frequency 40.68MHz 40.68MHz
Optical polarisation Linear, vertical to base Linear, vertical to base
Active aperture 1.8mm 1.6mm
Acoustic mode Compressional Compressional
Rise-time (10-90%) 113ns/mm 113ns/mm
Loss Modulation ≥ 85% ≥ 85%
RF Power 20W (Max) 20W (Max)

2.  Air-cooled Q-switch: QS068-4J-xxx

Device AO Q-Switch
Model No QS068-4J-xxx
Interaction material Fused Silica
Wavelength 1540nm
Damage threshold >500MW/cm2
AR coating reflectivity < 0.2% per surface
Transmission > 99.6%
Frequency 68MHz
Optical polarisation Random
Active aperture 1.0mm
Acoustic mode Shear
Rise-time 120ns
Modulation Bandwidth (3dB) 4.2MHz
Separation Angle 28mrad
Diffraction Efficiency >10% @ 6W
Maximum recommended RF Power 10W
Cooling Conduction cooled through base
Q-switch driver N39068-10DSA05

3. Air-cooled Q-switch: QS080-2G-3D1

We present probably the smallest, conduction-cooled, acousto-optic Q-Switch currently in production anywhere in the world. Specifically designed for use in miniature, short-pulse, low power, DPSS lasers, the tiny size of this device facilitates Q-Switching of the shortest cavities.

Utilising a highly efficient crystalline interaction material, greater than 85% loss modulation can be achieved without the need for active cooling - just bolt the Q-Switch to the laser rail and switch on!

Operating at 80MHz carrier frequency, the diffracted beams are sufficiently separated for most short cavities and pulse repetition rates of 100kHz or more are possible. - DPSS systems, polarisation insensitive - Miniature size, conduction-cooled - 1.0mm active aperture

Model

QS080-2G-3D1

I-QS080-1.5C10G-4-SO12

Interaction Material

Tellurium Dioxide

Crystal Quartz

Wavelength

1047 to 1064nm

1064nm

Polarization

Insensitive

Random or linearly polarised

Anti-Reflection Coating

<0.2% per surface

< 0·2% per surface

Damage Threshold

>10MWcm2

> 1GW/cm2

Transmission (single pass)

>99.5%

> 99·6%

Frequency

80MHz

80MHz

VSWR

<1.2:1 (50Ω input impedance)

<1.2:1 (50Ω input impedance)

Active Aperture

1.0mm

1.5mm

Acoustic Mode

Compressional

Compressional

Rise-Time / Fall-Time

153ns/mm

113ns/mm

Loss Modulation

>85% at 3W (typical)

>85% (polarised)

>70% (unpolarised)

Beam Angle

20mrad

14.9mrad

RF Power Rating

3W, CW

20W

Cooling

Conduction through base

Conduction through base

RF Driver

R39080-3DMzzz-SC

 

Model

97-03277-01

97-03278-02

97-03300-01

97-03306-01

Interaction Material

Crystal Quartz

Acoustic Velocity

5.74mm/µs

Active Aperture*

1 mm

1 mm

1.5 mm

2.0 mm

Center Frequency

80MHz

VSWR

<1.2:1 (50Ω input impedance)

Wavelength

1064nm

Insertion Loss

Max 1%

Reflectivity

Max 0.1% per surface

AR Coating

MIL-C-48497

Damage Threshold

500MW/cm2

Polarization

Linear, vertical to the base

RF Power rating

12W

3.5W

20W

25W

Beam Separation

14.8 mrad

Rise / Fall time

50nsec

Loss Modulation

85%

50%

85%

85%

4. Ultra Compact Conduction Cooled 80MHz Q-Switches

I-QS080 is an ultra-compact conduction-cooled Acousto-Optic Q-Switch, ideally suited to short cavity end pumped Nd:YAG & Nd:YVO4 lasers. Utilising top grade Crystal Quartz for increased efficiency & thermal stability, with high quality optical finishing & high damage threshold antireflection coatings to provide high damage threshold & low insertion loss. In addition to the specifications indicated, we also offer alternative wavelengths, RF frequencies, active apertures & an extensive range of mechanical housing configurations. We also offer full custom design & manufacturing, enabling ourcustomers to achieve the perfect solution. Our scientists and engineers are available to assist in selecting the most appropriate model of Q-Switch and also RF driver for your application.

General Specification:

Model I-QS080-0.5C10G-8-GH48 I-QS080-1C10G-8-GH28
Interaction material: Crystal Quartz Crystal Quartz
Wavelength: 1064nm 1030 to 1064nm
Damage threshold:  > 1GW/cm2 > 1GW/cm2
AR coating reflectivity: < 0·2% per surface < 0·2% per surface
Transmission:  > 99·6% > 99·6%
Frequency:  80MHz 80MHz
Optical polarisation:  Linear, vertical to base Linear, vertical to base
Active aperture: 0.5mm 1.0mm
Acoustic mode:  Compressional Compressional
Separation angle:  14.9mrad 14.9mrad
Rise-time (10-90%):  113ns/mm 113ns/mm
Loss modulation: >= 85% >= 85%
RF power: 10W (max) 10W (max)
Storage temperature: -20 to +70degC -20 to +70degC
Dimension  42x12x15mm 46x22x20mm

There are too many types of Q-switches with various laser wavelengths, RF frequencies and active apertures and please feel free to contact us via email once you have a special application or requirements.

 Water-cooled Q-switchQ-switch DriverPrinciple of Q-switching

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