Calcium fluoride crystal

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Summary： Calcium fluoride single crystals offer the advantages of a broad spectral range, enabling operation from 155 to 7000 nm, along with a high laser‑damage threshold, low stress birefringence, and a high refractive index.

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　　Calcium fluoride single crystals offer the advantages of a broad operational wavelength range—usable from 155 to 7000 nm—along with a high laser‑damage threshold, low stress birefringence, and a high refractive index. Their drawbacks include relatively low hardness and poor thermal stability.

　　Available in diameters ranging from φ5 mm to φ150 mm, this material is suitable for applications in laser technology—particularly deep‑ultraviolet excimer lithography—as well as in the infrared and ultraviolet optics and high‑energy detection fields. It serves as a key material for fabricating optical components such as prisms, lenses, and windows in optical systems.

Transmittance curve

Physical and mechanical properties
Density	3.18 g/cm ³	Coefficient of thermal expansion	1.89×10 ^-5 /°C
Purity	99.999%	Thermal conductivity	9.71 J/k.m.s
Refractive index	1.39908	Heat capacity	0.854 J/g·K
Knoop hardness	158.3 kg/mm ²	Young's modulus	75.8 GPa
Melting point	1360 ℃	Poisson's ratio	0.26

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