Laser Beam Expanders

Special Optics Inc have been manufacturing and designing the highest quality lens systems since 1965. Their range of beam expanders is extensive and includes low power, high power, large aperture, manual zoom and motorized variable zoom beam expanders, covering wavelengths from the UV to the IR

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Detailed specifications on all Special Optics Laser Beam Expanders

Laser Beam Expander theory section

Custom lens specification request form

Coating curves

Low Power Beam Expanders

Adjustable focus for collimation at various wavelengths

Diffraction limited design

< 1/8 Wavefront distortion

> 97% transmission

500 MW/cm2 coating damage threshold

248 - 1550 nm useable spectral range

Model No.	Expansion Ratio	Input Aperture (mm)	Output Aperture (mm)	Length @ 1064nm (mm)
50-25-2X-λ	2X	11	22	89
50-25-3X-λ	3X	7.3	22	108
50-25-4X-λ	4X	5.5	22	118
50-25-4.5X-λ	4.5X	4.8	22	126
50-25-5X-λ	5X	4.4	22	122
50-25-6X-λ	6X	3.6	22	128
50-25-7X-λ	7X	3.1	22	131
50-25-8X-λ	8X	2.7	22	138
50-25-10X-λ	10X	2.2	22	140
50-25-12X-λ	12X	1.8	22	141
50-25-18X-λ	18X	1.3	22	145
50-51-4X-λ	3.9X	11.7	47	203
50-51-7X-λ	6.8X	6.7	47	239
50-51-10X-λ	10.2X	4.7	47	253
50-51-20X-λ	20.6X	2.3	47	267

High Power Beam Expanders

Adjustable focus for collimation

Diffraction limited design

< 1/4 Wavefront distortion

> 97% transmission

500 MW/cm2 coating damage threshold

400 - 1550 nm useable spectral range

Model No.	Expansion Ratio	Input Aperture (mm)	Output Aperture (mm)	O.D. x Length @ 1064nm (mm)
52-25-2X-λ	2X	7	15.0	34.9 x 72
52-25-4X-λ	4X	7	30.0	44.5 x 127
52-51-7X-λ	7X	7	51.6	66.7 x 172
52-71-5X-λ	5X	14	71.6	85.7 x 248
52-71-10X-λ	10X	7	71.6	85.7 x 248
52-71-20X-λ	20X	3.5	71.6	85.7 x 248

IR Beam Expanders

Adjustable lens spacing

Low insertion loss

Zinc Selenide lens elements

9.0 - 10.6μm wavelength range

Model No.	Expansion Ratio	Input Aperture (mm)	Output Aperture (mm)	O.D. x Length (mm)
53-25-2X-λ	2X	12.5	25.0	38.1 x 83
53-25-3X-λ	3X	4.0	15.0	31.75 x 83
53-25-5X-λ	5X	5.0	25.0	44.5 x 109
53-25-10X-λ	10X	2.5	25.0	38.1 x 147
53-50-2X-λ	2X	25.0	50.0	69.9 x 147
53-50-5X-λ	5X	10.0	50.0	69.9 x 147
53-50-10X-λ	10X	5.0	50.0	69.9 x 147
53-76-5X-λ	5X	14.4	72.0	85.7 x 230
53-76-10X-λ	10X	7.2	72.0	85.7 x 230

UV Beam Expanders

No focused retro-reflections

Adjustable lens spacing

Low insertion loss

< 1/4 Wavefront distortion

> 97% transmission

248 - 351nm wavelength range

Model No.	Expansion Ratio	Input Aperture (mm)	Output Aperture (mm)	O.D. x Length (mm)
61-25-4X-λ	4X	6.25	25.0	31.75 x 120
61-25-7X-λ	7X	3.50	25.0	31.75 x 134
61-25-10X-λ	10X	2.50	25.0	31.75 x 141

Variable Beam Expanders

Compatable with standard computer controlled actuators

Replaces several fixed wavelength devices

Low insertion loss

< 1/4 Wavefront distortion

> 95% transmission

248 - 351nm wavelength range

Model No.	Expansion Range	Input Aperture (mm)	Output Aperture (mm)	Wavelength range
56-30-2-8X-λ	2-8X	10.0	30.0	450 - 1100nm
56-45-2-8X-λ	2-8X	10.0	45.0	450 - 1100nm
53-26-2-10X-λ	2-10X	10.0	26.5	9.3 or 10.6μm
61-30-2-8X-λ	2-8X	10.0	30.0	248 – 355nm

Motorised Beam Expanders

Diffraction-limited design

5 element design reduces internal focus

Continuous zoom and focus adjustments

Mechanicals specifically designed to minimize beam wander

Expansion Range	2x-8x Continuous or 1x-4x continuous
Input Aperture	10mm Max
Output Aperture	30mm
Beam Wander	0.15 mRad for 1-4X Beam Expander 0.3 mRad for 2-8X Beam Expander
Wavefront Distortion	<1/4 Wave @ 633 nm
Beam Wander	0.15 mRad for 1-4X Beam Expander 0.3 mRad for 2-8X Beam Expander
Usable Wavelength Range	450-675nm 600-900nm 800-1200 1100-1600nm 248-425 nm 9.3 or 10.6um
Field of View	+/-0.5 degrees
Transmission	>95%
Expansion Change Time	< 10 seconds
Usable Temperature Rang	-10 to +50 Celsius

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