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Partial Reflection (PR) coatings provide attenuation functions and are generally applied to output mirrors of laser cavity. Our company can design the PR coating with reflectance from 10% to 99.7% to achieve the desired performance.
Wideband PR coatings are typically used at 45 degrees angle to the beam splitting of wideband light, such as 50/50，40/60，30/70 with error at around 5%.
There is a kind of super wideband PR coatings that can split beam in a wide light region from UV, visible to infrared. This coating is widely used in optical components
Single Wavelength PR Coatings
Substrate fused silica, BK7
Surface Figure <λ/10 @ 632.8nm
Surface Quality 40-20
Chamfer 0.5mm, 45°
Coating Material Electron beam deposited dielectric multi-layers
Clear Aperture > Central 85% of diameter
Rear Surfsce AR Coating R<0.2%
Reflectance and Tolerance