11 Dec 2012 Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7µm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride's low index or refraction allows it to be used without an anti-reflective coating.
Specification
Dimension Tolerance: +0.0, -0.1mm
Thickness Tolerance: ±0.1mm
Clear Aperture: >80%
Parallelism: 1arc minute
Surface Quality: 60/40(40/20) scratch and dig
Wavefront Distortion: L per 25mm @633mm
Bevel: <0.25mm x 45°
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