Air-cooled Q-switches

List of Products

Air-cooled Q-Switch Used in DPSS Lasers

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

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

l Compact conduction cooled, crystal quartz

l 2mm active aperture

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 (QS041-10G-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)

Remark: The main difference of the above Q-switches is the dimensions.

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

� DPSS systems, polarisation insensitive

� Miniature size, conduction-cooled

� 1.0mm active aperture

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.

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 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 our customers 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.

Key Features:
-> Compact package
-> Conduction-cooled
-> High damage threshold
-> High efficiency
-> Custom configurations available

Application examples:
-> Material processing:
-> Marking
-> Engraving
-> Scribing
-> Surface treatment

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 polarization:	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

5. Low Power Q-Switches for polarized or random polarized lasers:

Spectral Range (nm)	Q-Switch Mode	Recommended Driver Model Number	Loss Modulation (% @ Watts) @1064nm Polarization	Active Aperture (mm)	Center Frequency (MHz)	Rise Time (ns/ mm beam dia.)	Optical Power Density/ (cm2) Ave./Pk	Interaction Material
1064	33027-10-1.5-I	39027-10DS 39027-10DM	80 @ 10 Linear Perpendicular 65 @ 10 Random	1.5	27.12	115	50KW/500MW	Crystal Quartz
1064	33041-10-1.5-I	39041-10DS 39041-10DM	72 @ 10 Linear Perpendicular 45 @10 Random	1.5	40.68	115	50KW/500MW	Crystal Quartz
1064	33041-20-1.5-I-TB	39041-20DMFPS-SC	90 @ 20 Linear Perpendicular 80 @20 Random	1.5	40.68	115	50KW/500MW	Crystal Quartz
1064	33080-10-1-I	39080-10DS 39080-10DM	80 @ 10 Linear Perpendicular 60 @ 10 Random	1	80	115	50KW/500MW	Crystal Quartz
1064	33027-25-3-BR	39027-30DSA05 39027-30DMA05	75 @ 25 Linear Perpendicular	2	27.12	175	50KW/500MW	Fused Silica

6. Low Power Q-Switches for random polarized lasers:

Spectral Range (nm)	Q-Switch Model	Recommended Driver Model Number	Loss Modulation (%@Watts) @1064nm Polarization	Active Aperture (mm)	Center Frequency (MHz)	Rise Time (ns / mm) beam dia.	Optical Power Density /(cm2) Ave./Pk	Interaction Material
1064	34027-1.5-SF10	38027-4DS 38027-4DM	30 @ 2 Random 60 @ 4 Random	1.5	27.12	165	120KW/500MW	SF10
1064	34041-1.5-SF10	38041-4DS 38041-4DM	20 @ 2 Random 40 @ 4 Random	1.5	40.68	165	120KW/500MW	SF10
1064	34080-1-SF10	38080-4DS 38080-4DM	20 @ 2 Random 40 @ 4 Random	1	80	165	120KW/500MW	SF10