If you need a higher transmittance in the ultraviolet band or a lower coefficient of thermal expansion, you can choose a UV fused silica right-angle prism. Ultraviolet grade fused silica has high transmittance in deep ultraviolet and almost no laser-induced fluorescence (measured at 193 nm), so it is ideal for applications from ultraviolet to near infrared. For a given wavelength, the refractive index of UV fused silica is smaller than that of N-BK7.
Specifications:
Material : Fused Silica
Diameter : 1mm ~ 300mm
Dimension Tolerance :+0.0/-0.1mm
Surface Quality :40/20 or better
Angle Tolerance :<3 arcmin
Clear Aperture :>90%
Surface Flatness : λ/8 , λ/4
Bevel : Protective bevel as needed
Coating :Upon your request
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