Air-Cooled Q-switches

  • Update:Jun 13, 2017
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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.

Product Introduction

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.

- DPSS Nd:YAG / Nd:YVO4, linearly polarized

- Compact conduction cooled, crystal quartz

- 2mm active aperture

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

Interaction Material Tellurium Dioxide
Wavelength 1047 to 1064nm
Polarisation Insensitive
Anti-Reflection Coating <0.2% per surface
Damage Threshold >10MWcm-2
Transmission (single pass) >99.5%
Frequency 80MHz
VSWR <1.2:1 (50Ω input impedance)
Active Aperture 1.0mm
Clear Aperture 1.4mm
Acoustic Mode Compressional
Rise-Time / Fall-Time 153ns/mm
Loss Modulation >85% at 3W (typical)
Beam Separation 20mrad
Acceptance Angle (full) 12mrad
RF Power Rating 3W, CW
Cooling Conduction through base
Dimension 19x9.6x16.5mm
RF Driver R39080-3DMzzz-SC

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-GH28 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