Calcium Fluoride(CaF2) Window
Calcium fluoride (CaF2) with high hardness, strong resistance to mechanical shock and thermal shock, and good transmittance in UV, visible and infrared fields, are widely used in scientific and technological fields such as lasers, infrared optics, UV optics and high-energy detectors, especially they have good optical properties in the UV band. With high transmittance and low fluorescence radiation, calcium fluoride plano convex lens is an ideal material for UV photodetectors, UV lasers and UV optical systems.
Calcium fluoride (CaF2) window is one of the basic optical components in optics, usually used as a protective window for electronic sensors or detectors of the external environment. It is used to separate the two sides of the environment, such as separating the inside of the instrument from the outside, so that the inside and outside of the instrument are isolated from each other, thus protecting the internal devices. And it’s often used for Optical Instrument Manufacturing, Aerospace Optical Systems, Laser Optical Systems, infrared and ultraviolet optical systems, Optical Communication systems, High Energy Physics experiments, Medical imaging Equipment Etc.
Our company can provide Calcium fluoride (CaF2) round ,square and rectangular glass window with diameters from 2-300mm.and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.
Technical parameters of CaF2 Window
Diameter | 2-300mm |
Thicknesses | 0.12-60mm |
Dimension tolerance | +0/-0.1mm |
Thickness tolerance | ±0.1mm |
Surface quality (scratch & dig) | 60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | AR coating or cutom |
Material properties of CaF2
Optical Properties | |
Transmission Range | 0.13-10μm |
Transmittance | >94%@193nm-7.87μm |
Refractive Index | 1.4288@2.5μm |
1.39908@5μm | |
Reflection Loss | 5.4%@5μm(both surfaces) |
Absorption Coefficienet | 7.8×10-4@2.7μm |
Structure | Cubic Crystal System |
Cleavage Planes | <111> |
Physical Properties | |
Density[g/cm3] | 3.18 |
Melting Point [℃] | 1420 |
ThermalConductivity [W/(m×K)] | 9.71 @ 293K |
Thermal Expansion [10-6/K] | 18.5 @ 273K |
Knoop Hardness [kg/mm2] | 158.3 |
Specific Heat Capacity [J/(kg×K)] | 854 |
Dielectric Constant | 6.76 @ 1 MHz |
Young's Modulus (E) [GPa] | 75.8 |
Shear Modulus(G) [GPa] | 33.77 |
Bulk modulus(K) [GPa] | 82.71 |
Poisson Coefficient | 0.26 |
Chemical Properties | |
Solubility / g/L | 0.016g @ 20℃ |
Molecular Weight / g/mol | 78.0748 |
Transmission curve
The transmission spectrum of calcium fluoride (CaF2) ranges from 130 nm to 10 μm. High hardness, strong resistance to mechanical and thermal shocks, and good transmittance of calcium fluoride (CaF2) meniscus lens in the UV, visible and IR fields are widely used in scientific and technological fields such as lasers, IR optics, UV optics and high-energy detectors, especially they have good optical properties in the UV band and are the known optical properties in the UV cut-off band. With high transmittance and low fluorescence radiation, calcium fluoride is an ideal material for UV photodetectors, UV lasers and UV optical systems.
