25.4mm Dia., 1mm Thick, Uncoated, ISP Optics Sapphire Window | AL-W-25-1

Product Details High Corrosion Resistance and Thermal Stability Higher Durability than Glass Windows Transmission from 0.33 – 5.5µm ISP Optics Sapphire Windows are highly durable and transmissive protective windows that are ideal for harsh environments. Sapphire is chemically inert, insoluble in water, and resistant to common acids and alkalis. Chemically, sapphire is single crystal aluminum oxide (Al 2 O 3 ) and is useful in a transmission range from 0.33 – 5.5µm when uncoated. ISP Optics Sapphire Windows feature a Knoop Hardness of 1900 and are are resistant to scratches, digs, and fractures that might otherwise weaken fused silica substrates. These windows are often used in applications with high temperatures and pressure such as viewports for vacuum or plasma chambers. Specifications General Model Number: AL-W-25-1 Type: Protective Window Type of Window: Crystal Physical & Mechanical Properties Clear Aperture CA (mm): 21.59 Diameter (mm): 25.40 +0.00/-0.13 Thickness (mm): 1.00 ±0.13 Parallelism (arcmin): <3 Bevel: Protective as needed Clear Aperture (%): 85 Edges: Fine Ground Poisson's Ratio: 0.27 Young's Modulus (GPa): 435 Knoop Hardness (kg/mm 2 ): 1,900.00 Optical Properties Coating: Uncoated 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: 60-40 Abbe Number (v d ): 72.24 Birefringence (n o -n e ): 0.008 for Visible Light Orthogonal to Optical Axis Axis Orientation: Random Wavelength Range (nm): 330 - 5500 Surface Flatness (P-V): 2λ per 25.4mm Material Properties Density (g/cm 3 ): 3.97 Coefficient of Thermal Expansion CTE (10 -6 /°C): 8.8 Regulatory Compliance Certificate of Conformance: View ×