| Place of Origin: | Wuhan,China |
|---|---|
| Brand Name: | Wuhan Siwer Optics |
| Minimum Order Quantity: | 5 pieces |
| Price: | 20-98USD/piece |
| Packaging Details: | 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler |
| Delivery Time: | 3-5 weeks |
| Payment Terms: | T/T, Western Union |
| Supply Ability: | 1000 pieces/month |
| Material: | Calcium Fluoride(CaF2) | Size Tolerance: | +/-0.1mm |
|---|---|---|---|
| Chamfer: | 0.2-0.5mm | Surface Quality: | 60/40 |
| Surface Flatness: | Lambda/4 In 25.4mm | Parallelism: | 0.01mm |
| Standard Coating: | Uncoated Or Customized | Size Range: | 3-120mm |
| Usage: | Infrared System | ||
| Highlight: | optical window,infrared system protectd window |
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Calcium Fluoride (CaF₂) is commonly used for optics looking at the IR and UV spectrums and has a very low change in refractive index with wavelength.
| 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