CaF2 Window
Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage...
CaF2 Window
Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride’s low index or refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. TECHSPEC® Calcium Fluoride (CaF 2 ) Windows manufactured fr...
- ManufacturerOST Photonics
- CategoryInfrared Window
- Lead TimeQuoted per order
- CustomizationSize, orientation and surface finish to drawing
Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride’s low index or refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. TECHSPEC® Calcium Fluoride (CaF2) Windows manufactured from vacuum UV grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.
Advantages
1 ) Low Absorption, High Transmission UV Grade Calcium Fluoride
2 ) Ideal for Applications Ranging from 250nm – 7μm
3 ) Low Index of Refraction
Specifications
1 ) Diameter: 3~375mm
2 ) Diameter Tolerance: +/-0.2mm
3 ) Thickness Tolerance: +/-0.03mm
4 ) Aperture: >90%
5 ) Surface Quality: 80/50~10/5 (S/D)
6 ) Parallelism: <1 arc minute
7 ) Chamfer: 0.3-0.5mmx45°
Optical Properties
| Transmission Range | 0.13 to 10 micron |
| Refractive Index | 1.39908 at 5 micron |
| Refractive Loss | 5.4% at 5 micron |
| Crystal/Class Structure | Cubic CsCl, Pm3m |
| Cleavage Plane | No cleavage planes |
Thermal Properties
| Thermal Expansion | 47.9×10－6 /℃ at 273K |
| Thermal Conductivity | 9.71 W m－1K－1 |
| Melting Point | 1360 ℃ |
| Specific Heat Capacity | 854 J Kg－1K－1 |
Mechanical Properties
| Density | 3.18 g/cc |
| Hardness(Knoop) | 158.3 (100) with 500g indenter |
| Youngs Modulus | 75.8 GPa |
| Shear Modulus | 33.77 GPa |
| Bulk Modulus | 82.71 GPa |
| Poisson Ratio | 0.26 |
| Elastic Limit | C11=164 C12=53 C44=33.7 |
| Molecular Weight | 78.08 |
Chemical Properties
| Solubility | 0.0017 g/100g water at 20℃ |
Technical Images
Other Infrared Window Materials
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