50.8mm Dia., 1mm Thick, BBAR (2000 – 5000nm) Coated Sapphire Window

Product Details Features Extreme Surface Hardness Chemical Resistance Transmits Wavelengths Ranging From UV to Mid-Infrared Thinner and Stronger than Standard Glass Windows Anti-Reflection Coating Options Covering 350 – 5000nm Available TECHSPEC Sapphire Windows are manufactured from single crystal sapphire, making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamond and, because of their structural strength, sapphire windows can be made much thinner than other common windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al 2 O 3 ) and is useful in a transmission range from UV to mid-infrared or 330 – 5500nm when uncoated. TECHSPEC Sapphire Windows are available with anti-reflection (AR) coatings to improve performance in the visible, NIR, and IR spectra with coating options covering 350 – 5000nm. Specifications General Type: Protective Window Physical & Mechanical Properties Clear Aperture CA (mm): 45.72 Diameter (mm): 50.80 ±0.05 Thickness (mm): 1.00 ±0.05 Parallelism (arcmin): ≤3.5 Bevel: Protective as needed Clear Aperture (%): ≥90 Edges: Fine Ground Poisson’s Ratio: 0.27 Young’s Modulus (GPa): 435 Knoop Hardness (kg/mm 2 ): 1,900.00 Optical Properties Coating: BBAR (2000-5000nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Sapphire (Al 2 O 3 ) Index of Refraction (n d ): 1.77 Surface Quality: 80-50 Abbe Number (v d ): 72.24 Birefringence (n o -n e ): 0.008 for Visible Light Orthogonal to Optical Axis Axis Orientation: Random Coating Specification: R avg <1.5% @ 2000-5000nm R abs <3.0% @ 2000-5000nm R avg <1.75% @ 2000-4000nm Wavelength Range (nm): 2000 - 5000 Surface Flatness (P-V): 2λ (typical) Material Properties Density (g/cm 3 ): 3.97 Coefficient of Thermal Expansion CTE (10 -6 /°C): 5.4 (Parallel to C-Axis) 4.3 (Perpendicular to C-Axis) Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×