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| Categories | Infrared Window | 
|---|---|
| Brand Name: | Wuhan Siwer Optics | 
| Place of Origin: | Wuhan,China | 
| MOQ: | 5 pieces | 
| Price: | 20-98USD/piece | 
| Payment Terms: | T/T, Western Union | 
| Supply Ability: | 1000 pieces/month | 
| Delivery Time: | 3-5 weeks | 
| Packaging Details: | 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler | 
| 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 | 
| Company Info. | 
| Wuhan Siwer Optics Co.,Ltd | 
| View Contact Details | 
| Product List | 
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

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