157nm VUV Grade | 2.75CF | CaF-012

2.75CF 304 ss | 157nm VUV Grade | Calcium Fluoride (CaF2) UHV Viewport | 0.90 Inch View

This Calcium fluoride extended range UHV viewport is of ultraviolet (UV) grade and has excellent transmission from 200 nm in the UV through 10.5 microns in the infrared. The non-magnetic UHV mount is a 2.75 inch Conflat flange made of 316LN stainless steel flange with magnetic permeability less than 1.010.  The threaded mount mates with safety cover and protective cap using the SM1 Lens Tube System*. A transparent 6mm thick polycarbonate protective cover is available for safe viewing while the primary CaF2 window is not in service. It may also be purchased with a protective anodized aluminum cap for greater thermal uniformity during bake-out.