Precision glass windows-BK7 type (λ/4) These Precision Glass Windows are optically-polished with parallel faces and are useful not only as windows but as substrates for special beamsplitters etc. These Precision Glass Windows are offered uncoated, AR-coated for ranges covering both visible and NIR (450-900nm). As these windows have parallel faces they are ideal for applications that require minimal transmitted beam deviation.
Knight Optical > Windows BK7 Window - Quality Grade (Lambda/4) This is the section containing BK7 Window - Quality Grade (Lambda/4). Borosilicate Window - Polished Grade ( Lambda/1) This is the section containing Borosilicate Window - Polished Grade ( Lambda/1). Borosilicate - Float grade This is the section containing Borosilicate - Float grade . Quartz Window (Lambda/2) This is the section containing Quartz Window (Lambda/2). Sapphire Window (2.5 Lambda) This is the section containing Sapphire Window (2.5 Lambda). Silicon Window (2.5 Lambda) This is the section containing Silicon Window (2.5 Lambda). UV Fused Silica Window (Lambda/2) This is the section containing UV Fused Silica Window (Lambda/2). White Float Windows - Uncoated This is the section containing White Float Windows - Uncoated. White Float Windows - AR coated one side This is the section containing White Float Windows - AR coated one side. White Float Windows - AR coated both sides This is the section containing White Float Windows - AR coated both sides. White Float Windows - ITO coated one side This is the section containing White Float Windows - ITO coated one side. 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! Knight Optical > Windows
Specification   Material: BK7 Material Data: (see materials section) Diameter: +0, -0.15mm Length, width: ±0.1mm Thickness: ±0.1mm Flatness: λ/4 over 90% of aperture dimensions Scratch-dig <40-20 Parallelism <30 arcsec
Specific requirements We can manufacture Precision BK7 glass 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.)   · Other coatings   · Edging to smaller diameters See also Optical flats