China CaF2 UV-IR Optical Window

CaF2 crystal have good performance at 0.13~10 μm wavelength range, wide range of light.CaF2 cyrstal is transparent over a broad range from ultraviolet (UV) to infrared (IR) frequencies.

CaF2 is used to manufacture optical components such as windows and lenses, used in thermal imaging systems, spectroscopy, and excimer lasers, Fourier analysis, testing instruments, gas liquid laser system, astronomical telescope, MIR/NIR imaging system, etc.
2. Properties

Optical PropertiesTransmission Range130 nm to 10 μmTransmittance>94% at 193 nm to 7.8 μmRefractive Index1.39908 at 5 μmReflection Loss5.4% at 5 μm (both surfaces)Absorption Coefficient0.03 cm-1 at 2.6 μm to 2.9 μmdn/dT-10.6 x 10-6 /ºCPhysical PropertiesDensity3.18 g/cm3Melting Point1360ºCThermal Conductivity9.71 Wm-1K-1 at 286KThermal Expansion18.85 x 10-6 /ºC at 273KKnoop Hardness158.3 with 100g indenter (kg/mm2)Specific Heat Capacity854 J/(kg.k)Dielectric Constant6.76 at 1MHzYoungs Modulus (E)75.80 GPaShear Modulus (G)33.77 GPaBulk Modulus (K)82.71 GPaElastic CoefficientC11=164; C12=53; C44=33.7Apparent Elastic Limit36.54 MPa (3900 psi)Poisson Ratio0.26Chemical PropertiesSolubility0.0017 g/ 100g water at 20ºCMolecular Weight78.08StructureCubic CrystalCleavage Plane-111