Active Member
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[China]
Address: Building 7, No. 116, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province
Contact name:Jason
Wuhan Siwer Optics Co.,Ltd |
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Calcium Fluoride is used for optical windows, drilled discs, lenses
and prisms in transmision range 0.15-9µm. Degradation due to to
moisture in the atmosphere is minimal, and polished surfaces of the
CaF2 windows may be expected to withstand several years exposure to
normal atmospheric conditions.
Since they are nonaxial, CaF2 crystals do not require consideration
of axial direction. Because of CaF2 low refractive index, Calcium
Fluoride windows can be used without an anti-reflection coating.
Typical applications: VUV - UV - IR imaging systems, excimer laser
windows, CaF2 viewport, Spectroscopic windows and lenses.We produce
CaF2 windows and mirrors for European manufacturers of gas
detectors and gas analyzers.
| Material | Calcium Fluoride |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Parallelism | 1 arc min |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) | λ/2 at 633nm |
| Surface Irregularity (Peak to Valley) | λ/2 at 633nm |
| Clear Aperture | 90% |
| Chemical Formula | CaF2 |
| Crystal Class | Cubic, cleaves [111] plane |
| Lattice Constant, Å | 5.46 |
| Density, g/cm3 (20 °C) | 3.18 |
| Molecular Weight | 78.08 |
| Reflection Loss | 5.4% at 5 μm |
| Absorption Coefficient | 7.8 x 10-4 cm-1 @ 2.7 μm |
| Dielectric Constant for 105 Hz | 6.76 |
| Melting Temperature, K | 1630 |
| Thermal Conductivity, W/(m K) at 273 K | 10 |
| Thermal Expansion, 1/K at 300 K | 18.9 x 10-6 |
| Specific Heat, cal/(g K) at 273 K | 0.204 |
| Debye Temperature, K | 510 |
| Young's Modulus, GPa | 75.79 |
| Rupture Modulus, GPa | 0.0365 |
| Shear Modulus, GPa | 33.76 |
| Bulk Modulus, GPa | 83.03 |
| Poisson's Ratio | 0.28 |
| Knoop Hardness, kg/mm2 | 178 [100], 160 [110] |
Production process
