Calcium fluoride window lens
Material: calcium oxide single crystal
Specification: D10/15/20/25/30/40/50/60/80/100/150
Transmission range (μm): 0.13~9.0
Transmittance: >90% (0.3~7μm, 3mm)
Refractive index (5μm): 1.39908
Expansion coefficient (℃-1): 18.85×10-6
Gram's hardness (kg/mm2): 158.3 (100)
Elasticity coefficient: C11=164; C12=53; C44=33.7
Young's modulus (Gpa): 75.79
Poisson's ratio: 0.28
Solubility (g/100gH2O-20℃): 0.0017
Solubility surface: (111)
Density (g/cm3): 3.18
Melting point (℃): 1360
Application fields: High-energy machine optics, Excimer lasers
Calcium fluoride (CaF2) has a high transmittance in the ultraviolet to mid-infrared (250nm~7um) so it is widely used in the manufacture of prisms, windows and lenses, etc. In some applications with a wide spectral range it can be used directly without coating, especially its small absorption and high machine smell value make it ideal for excimer machine optical systems.