Sapphire windows (2.5 λ) Sapphire is an excellent material for windows, combining outstanding hardness, high thermal conductivity properties with an extremely wide transmission range from 170nm to 5.3 microns. It is often used for pressure windows, being approximately five times stronger than glass, and can be used at temperatures up to 2000°c. As sapphire has such hard structural strength, Sapphire Windows can be made much thinner than other materials, which can be useful.
Knight Optical > Windows > Silicon Window (2.5 Lambda) Only UK and EU customers are charged VAT at 17.5%, customers outside the EU and EU customers based outside the UK who have a valid EU VAT number will not be charged VAT Bulk Discounts! Where (B) appears next to a price below, bulk prices are available, click the (B) button to view! PDF Part No. Material Diameter (mm) Thickness (mm) Price Qty Buy WSI2500 Optical grade Silicon (Monocrystalline) 25.4 3 £20.35 Knight Optical > Windows > Silicon Window (2.5 Lambda)
Specification   Material: Sapphire Material Data: (see materials section) Diameter: +0.0 / -0.20 mm Thickness: ±0.1 mm Flatness: <2-5λ
Specific requirements We can manufacture Sapphire windows to any size at short notice, so if your requirements are not listed please contact us by telephone / fax or email: stockrequirement@knightoptical.co.uk Options available   · Mounting (circles up to 50mm dia.)   · AR coating   · Edging to smaller diameters See also Quartz windows (λ/2) UV-fused silica windows (λ/2)