12.5mm Dia., 1.5mm Thick, 400-1100nm HDAR Coated Fused Silica Window

Product Details HDAR Coating Achieves Severe Abrasion Requirements of MIL-C-675C Low Reflectivity Across the VIS-NIR Ideal for Use in Harsh Environments Uncoated Fused Silica Windows Also Available High Durability Anti-Reflection (HDAR) Coated Fused Silica Windows feature precision fused silica substrates with rugged HDAR coatings where frequent handling or cleaning are required. Similar to diamond-like carbon (DLC) coatings , the HDAR coatings are designed to withstand temperature cycling from -80 to +160°F, high humidity for 24 hours, salt spray for a continuous period of 24 hours, and salt solubility for an immersion period of 24 hours. These coatings are deposited on fused silica which has excellent mechanical and thermal stability, ensuring high performance even in harsh environments. High Durability Anti-Reflection (AR) Coated Fused Silica Windows are ideal for aerospace, defense, and industrial applications, as well as any optical application requiring durable protective windows. Specifications General Type: Protective Window Type of Window: Glass Physical & Mechanical Properties Clear Aperture CA (mm): 10.00 Diameter (mm): 12.50 +0.00/-0.20 Thickness (mm): 1.50 ±0.10 Bevel: Protective as needed Clear Aperture (%): 80 Edges: Fine Ground Parallelism (arcsec): <5 Poisson's Ratio: 0.16 Young's Modulus (GPa): 73 Knoop Hardness (kg/mm 2 ): 522.00 Optical Properties Coating: Hardened VIS-NIR (400-1100nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Fused Silica Index of Refraction (n d ): 1.458 Surface Quality: 20-10 Transmitted Wavefront, P-V: λ/10 Abbe Number (v d ): 67.8 Coating Specification: R avg <1.5% @ 400 - 1100nm R abs <2.0% @ 400 - 1100nm Wavelength Range (nm): 400 - 1100 Coating Temperature (°F): -80 to +160 per MIL-M-13508C Paragraph 4.4.4 Material Properties Density (g/cm 3 ): 2.20 Coefficient of Thermal Expansion CTE (10 -6 /°C): 0.52 (+5 to +35°C) 0.57 (0 to +200°C) 0.48 (-100 to +200°C) Fused Silica Grade: 7980 0G Environmental & Durability Factors Coating Abrasion: Severe, per MIL-C-675C Paragraph 4.5.10 Coating Adhesion: Per MIL-M-13508C Paragraph 4.4.6 Coating Humidity: ≥24 Hours per MIL-C-675C paragraph 4.5.8 Coating Salt Spray: ≥24 Hours per MIL-C-675C paragraph 4.5.9 Coating Salt Solubility: ≥24 Hours Immersion per MIL-C-675C paragraph 4.5.7 Regulatory Compliance Certificate of Conformance: View ×