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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. The Knoop hardness of calcium fluoride is 158.3. Calcium Fluoride (crystran CaF2) windows manufactured from vacuum UV-grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.

Application of CaF2 Calcium Fluoride Crystal Window
VUV, UV, IR optical systems
CaF2 crystals used for stable femtosecond white light generation from UV to IR
Thermal imaging
Fluorescence imaging
Excimer laser

Advantages of CaF2 Calcium Fluoride Crystal Window
Low Absorption, High Transmission UV Grade Calcium Fluoride
Ideal for Applications Ranging from 250nm – 7μm
Low Index of Refraction

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