Calcium fluoride (CaF2) windows are highly esteemed for their wide transmission from the ultraviolet (190 nm) to the mid-infrared (8 μm), low dispersion (Abbe number 95) and low thermal expansion. Due to their low refractive index (n≈1.43@10 μm), they perform excellently in UV lithography, infrared spectroscopy and laser systems, and can perfectly match with high refractive index materials. They are chemically resistant and have a high laser damage threshold, and can be used as excimer laser (193 nm) windows, infrared lenses and beamsplitters, but their hardness is moderate (Mohs hardness 4), requiring scratch protection.
| Parameter | Value |
| Diameter | 12.7 |
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