Calcium Fluoride CaF2 Optical Window
Calcium fluoride (CaF2) and magnesium fluoride (MgF2) crystals have high hardness, strong resistance to mechanical shock and thermal shock, and good transmittance in ultraviolet, infrared and infrared bands. They are widely used in lasers, infrared optics, ultraviolet optics and high-energy detectors.
In particular, they have good optical properties in the ultraviolet band. They are currently known optical crystals in the ultraviolet cutoff band, with high transmittance and low fluorescence radiation. They are ideal materials for ultraviolet photodetectors, ultraviolet lasers and ultraviolet optical systems. Unlike calcium fluoride (CaF2), magnesium fluoride (MgF2) is a birefringent crystal.
| Items | Parameters |
|---|---|
| Material | Calcium fluoride (CaF2) |
| Processable shapes | Circles, rectangles, polygons and other shapes |
| Diameter | 3mm-300mm ± 0.1mm |
| Center thickness tolerance | ± 0.05mm (we can process to ± 0.01mm with high precision) |
| Center deviation | 3′(we can process to 30 ″with high precision) |
| Surface accuracy | Reflection PV is better than 1/4λ, transmission PV is better than 1/10λ |
| Surface quality | 40/20 (we can process to 10-5 with high precision) |
| Effective caliber | ≥90% |
| Coating | According to the custom requirements |
Physical and chemical properties of calcium fluoride CaF2
| Density (g/cm3) | 3.18 |
|---|---|
| Melting point (℃) | 1360 |
| Dielectric constant | 6.76@1HMZ |
| Chemical purity (%) | 99.9996 |
| Thermal expansion coefficient (1/℃) | 18.85*10^-6 |
| 7.3*10^-6@373K | |
| Thermal conductivity (J/k.m.s) | 9.71 |
| Heat capacity (J/g.k) | 0.854 |
| Knoop hardness (kg/mm2) | 158.3 |
| Shear modulus (GPa) | 33.77 |
| Young's modulus(GPa) | 75.8 |
| Poisson's ratio | 0.26 |
Optical properties of calcium fluoride Caf2
| Transmission wavelength range | 130nm-10000nm |
|---|---|
| Refractive index inhomogeneity (ΔN/N) | ＜3*10^-6@632.8nm |
| Reflection loss (2 sides) | 5.4%@5000nm |
| Thermo-optic coefficient, dn/dT (1/℃) | -10.6*10^-6 |
Variation of refractive index with wavelength
| Wavelength (nm) | Refractive index (n) | Wavelength (nm) | Refractive index (n) |
|---|---|---|---|
| 190 | 1.51 | 2650 | 1.42 |
| 210 | 1.49 | 3900 | 1.41 |
| 250 | 1.47 | 5000 | 1.40 |
| 330 | 1.45 | 6200 | 1.38 |
| 410 | 1.44 | 7000 | 1.36 |
| 880 | 1.43 | 8220 | 1.34 |
In addition, We can customize the optical window according to customer requirements or drawings.
For details, please consult:
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