25.4mm Dia. x 1mm Thickness 1.65-3µm Coated Silicon Window

Product Details Transmission from 1.2 – 7μm Available Uncoated or AR Coated for 1.65 – 5μm Ideal for Weight Sensitive Applications TECHSPEC Silicon (Si) Windows manufactured from optical grade silicon are popular for the 1.2 – 7μm spectral region due to their low cost and low density. Due to its low density (half that of germanium or zinc selenide ), silicon is ideal for weight sensitive applications, especially those in the 1.65 – 5μm region. Density is 2.329 g/cm 3 and Knoop Hardness is 1150, making it harder and less brittle than germanium. TECHSPEC Silicon (Si) Windows available uncoated or AR coated for 1.65 – 5μm. These crystal windows are offered in diameters ranging from 10 – 76.20mm. Specifications General Type: Protective Window Type of Window: Crystal Physical & Mechanical Properties Clear Aperture CA (mm): 22.86 Diameter (mm): 25.40 +0.0/-0.1 Thickness (mm): 1.00 ±0.1 Parallelism (arcmin): <3 Bevel: Protective as needed Clear Aperture (%): 90.00 Edges: Fine Ground Poisson's Ratio: 0.27 Young's Modulus (GPa): 140 Knoop Hardness (kg/mm 2 ): 1,150.00 Optical Properties Coating: BBAR (1650-3000nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Silicon (Si) Index of Refraction (n d ): 3.422 @ 5µm Surface Quality: 60-40 Coating Specification: R avg <1% @ 1650 - 3000nm R abs <2% @ 1650 - 3000nm Wavelength Range (nm): 1650 - 3000 Surface Flatness (P-V): 1λ Material Properties Density (g/cm 3 ): 2.33 Coefficient of Thermal Expansion CTE (10 -6 /°C): 2.55 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×