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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

1064nm 2X – 8X Gemma® Variable Beam Expander

Stock #15-544 In Stock
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Laser V-Coat (1064nm)
Design Wavelength DWL (nm):
Entrance Aperture (mm):
Exit Aperture (mm):
Expansion Power:
2X - 8X
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica (Corning 7980)
Length (mm):
157.50 (without end caps)
Mounting Threads:
Input: Male M30 x 1.0
Output: Female M42 x 0.5
Transmission (%):
>97.5 @ DWL
Beam Expander
Weight (g):
Housing Diameter (mm):
Transmitted Wavefront, P-V:
<λ/10 for Input Beam 3.5mm (2X-6X)
<λ/10 for Input Beam 2mm (2X-8X)
Coating Specification:
Rabs <0.25% @ 1063 - 1065nm
Ravg <0.5% @ 1030 - 1100nm
Wavelength Range (nm):
1030 - 1100
Variable Magnification
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
10 J/cm2 (>3X), 5 J/cm2 (2-3X) @ 1064nm, 10ns, 20Hz
Divergence Adjustment:
Non-Rotating Optics
Pointing Accuracy (mrad):

Regulatory Compliance

Certificate of Conformance:

Product Family Description

TECHSPEC® Gemma® Variable Beam Expanders are ideal for high power laser applications where magnification changes may be required, such as prototyping or R&D. TECHSPEC Variable Beam Expanders feature λ/4 transmitted wavefront, Galilean designs, and high laser damage threshold AR coatings to ensure maximum transmittance while minimizing ghost reflections. Additionally, these beam expanders use internal translation and focusing mechanisms to continuously adjust magnification and laser divergence without affecting overall housing length. TECHSPEC® Gemma® Variable Beam Expander allow for continuous magnification change over the full magnification range.

TECHSPEC® Gemma® Variable Beam Expanders can be used to determine a system’s required beam magnification in the prototyping phase of development. TECHSPEC® Draconis® Broadband Beam Expanders are available for production or OEM implementation. Please contact our Sales Department for custom magnification requirements.