25mm Dia., 4mm Thick VIS-NIR Coated, 1λ Fused Silica Window

Product Details Available Uncoated or with Broadband Anti-Reflection Coatings Ideal for Cost Sensitive Broadband Applications Circular and Square Sizes from 5mm to 100mm λ/4 or λ/10 UV Fused Silica Windows Also Available TECHSPEC 1λ UV Fused Silica Windows are precision manufactured using UV-grade synthetic fused silica. In addition to superior transmission, the synthetic fused silica of these optical windows exhibits higher thermal properties, exceptional purity, and excellent environmental durability for demanding applications. The windows are ideal for cost-sensitive broadband applications and are available uncoated or with broadband anti-reflection coatings. TECHSPEC 1λ UV Fused Silica Windows have circular and square sizes ranging from 5mm to 100mm. λ/4 or λ/10 UV Fused Silica Windows are also available. Note: New additions to this product family may be specified with a transmitted wavefront distortion (TWD) specification instead of a surface flatness. For more information on the difference between these two specifications, see our application note on Understanding Optical Windows . Specifications General Type: Protective Window Type of Window: Glass Physical & Mechanical Properties Clear Aperture CA (mm): 22.50 Diameter (mm): 25.00 +0.00/-0.20 Thickness (mm): 4.00 ±0.38 Parallelism (arcmin): <5 Bevel: Protective as needed Clear Aperture (%): 90 Edges: Fine Ground Poisson's Ratio: 0.16 Young's Modulus (GPa): 73 Knoop Hardness (kg/mm 2 ): 522.00 Optical Properties Coating: VIS-NIR (400-1000nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Fused Silica (Corning 7980) Index of Refraction (n d ): 1.458 Surface Quality: 60-40 Transmitted Wavefront, P-V: 1λ Abbe Number (v d ): 67.8 Coating Specification: R abs ≤0.25% @ 880nm R avg ≤1.25% @ 400 - 870nm R avg ≤1.25% @ 890 - 1000nm Wavelength Range (nm): 400 - 1000 Damage Threshold, Reference: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification. 5 J/cm 2 @ 532nm, 10ns 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 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×