LightSmyth utilizes a unique patterning method, DUV projection photolithography and reactive ion etch, that offers a number of important advantages for transmission diffraction gratings. The same diffraction grating type may be used in a variety of applications.
Low wavefront deformation, even with thinner substrates, are of special value to pulse compression diffraction gratings. High diffraction efficiency (95% typical) allows our customers to minimize optical losses in multi-pass configurations. High energy pulsed and CW laser systems will benefit from high optical damage threshold of our diffraction gratings. They contain no organic materials and can withstand up to 500° C temperature with no performance degradation.
Unlike reflection diffraction gratings, transmission diffraction gratings may be polarization independent and operate at the optimal Littrow angle with conveniently large angular separation between the input and diffracted beam.
Robust and easily scalable fabrication offers economical, cost-effective diffraction gratings with rock-stable batch-to-batch performance.
Advantages:
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Exceptional diffraction efficiency for selected polarization
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Special design for broad passband and low angular sensitivity
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Ultra-polished quartz substrate minimizes wave front deformation in transmission
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Uses only fused silica and highly robust dielectric materials
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No polymers or organics are used
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Each diffraction grating is a master; ultra-low scatter
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Extremely precise line density (line density uniformity <0.001 lines/mm)
Applications:
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Pulse compression of pico- and femto-second pulses
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High power lasers
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Spectral beam combining and beam steering
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Remote optical sensors and spectroscopy
Product Brief: High Efficiency NIR Transmission Grating (700 to 1100 nm)
Specifications
Diffraction grating will perform with high efficiency over significantly larger spectral range and range of angles. Wavefront error <0.2 λ at operational wavelength over 25mm.
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Mechanical |
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Description |
Value |
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Substrate Width and Height Tolerance |
standard tolerance ± 0.2 mm |
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Grating Area Clear Aperture (CA) |
0.5 mm from substrate edge; exception: 125 mm for 130 mm wide gratings |
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Substrate Thickness |
0.675 ±0.050 or 0.95 ±0.050 (up to 10 mm custom thickness available) |
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Surface Quality in CA |
60/40 scratch/dig |
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Surface Quality outside of CA |
no requirements |
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Material |
Fused silica substrate, non-organic dielectrics. Contains no polymers. |
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Notes: |
Better tolerances and surface quality available for custom products |
Please contact LightSmyth Technologies at +1-541-431-0026 or info@lightsmyth.com to request a quotation or for additional technical information.
Custom High-Efficiency Transmission Gratings
LighSmyth offers custom highly-efficient transmission gratings fabricated to your specifications, including custom wavelength range, line count, size and performance levels. Substrate sizes up to 135 mm diameter are possible. Our optical engineers will gladly assist with your custom application.
