Fused Silica Re-Entrant

Description

The viewports comprise a high purity laser quality fused silica optic with precise flatness, parallelism, scratch and dig specifications which are vacuum brazed in to a kovar weld ring to form an optic assembly. The optic assemblies are TIG welded in to the tube assembly and are helium leak tested and cleaned for ultra high vacuum (UHV) conditions. The CF versions are offered using 304L stainless steel flanges, but 316LN flanges can be offered on request. The rugged construction of the fused silica viewports allows repeated bake-out with UHV performance, whilst the window offers broadband optical transmission through deep UV, visible to near infra-red. Various anti-reflective coatings to match customer reflectance requirements are processed at TSL and available as options. Laser viewports with a VAR coating optimised for specific customer specified laser wavelength, reducing reflectance to below 0.5% per face, are also offered. Please advise the wavelength or wavelength ranges of your application and a reflectance curve will be prepared. Annealed copper gaskets and other component accessories are also supplied by TSL. Please contact Torr Scientific if you require a quotation for a re-entrant viewport with a different length or different dimensions.