75mm Diameter Uncoated, Calcium Fluoride Window

Product Details Low Absorption, High Transmission UV Grade Calcium Fluoride Low Index of Refraction AR Coatings Spanning 250 – 5000nm Available Calcium Fluoride (CaF2) Wedged Windows also Available TECHSPEC Calcium Fluoride (CaF2) Windows offer a low index of refraction, providing high transmission from 200 – 7000nm when used uncoated. To further increase transmission and reduce back reflections, a variety of AR coatings are available spanning wavelength regions from the Ultra-Violet (UV) to the Mid-Wave Infrared (MWIR). The high bulk damage threshold of calcium fluoride coupled with its low absorption makes it a popular choice for use with laser systems, including excimer lasers. TECHSPEC Calcium Fluoride (CaF2) Windows are ideal for use as protective windows for gas detectors operating in the Vacuum UV (VUV) and MWIR, UV spectroscopy systems, cryogenically cooled thermal imaging systems, and as substrates for coatings requiring wideband substrate transmission. Note: Calcium fluoride is a relatively soft optical material and is more susceptible to scratches than typical glass windows. Calcium fluoride is also susceptible to thermal shock. Specifications General Type: Protective Window Type of Window: Crystal Physical & Mechanical Properties Clear Aperture CA (mm): 67.50 Diameter (mm): 75.00 +0.0/-0.1 Thickness (mm): 5.00 ±0.1 Parallelism (arcmin): <1 Bevel: Protective as needed Clear Aperture (%): 90 Edges: Fine Ground Poisson's Ratio: 0.26 Young's Modulus (GPa): 75.8 Knoop Hardness (kg/mm 2 ): 158.30 Optical Properties Coating: Uncoated Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Calcium Fluoride (CaF 2 ) Vacuum UV Grade Index of Refraction (n d ): 1.434 Surface Quality: 40-20 Abbe Number (v d ): 94.99 Axis Orientation: Random Wavelength Range (nm): 200 - 7000 Surface Flatness (P-V): λ/2 Material Properties Density (g/cm 3 ): 3.18 Coefficient of Thermal Expansion CTE (10 -6 /°C): 18.85 Regulatory Compliance RoHS 2015: Compliant × Reach 219: Compliant × Certificate of Conformance: View ×