| 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: | 180-8000nm | ||
| High Light: | ir window,infrared system protectd window |
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CaF2 is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. Its extremely
high laser damage threshold allows it to be used with excimer lasers. The material exhibits a low refractive index, varying from
1.35 to 1.51 within its usage range of 180 nm to 8.0 μm. Calcium fluoride is also fairly chemically inert and offers superior
hardness compared to its barium fluoride, magnesium fluoride, and lithium fluoride cousins. Calcium Fluoride has widespread IR application as windows, prisms and other lenses.
| 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
