157nm VUV Grade, Non-magnetic | MgF-033

4.50CF Low-mu ss | 157nm VUV Grade | Magnesium Fluoride (MgF2) UHV Viewport | 1.88 Inch View

This enhanced transmission 157nm VUV grade MgF2 extended range UHV viewport has excellent transmission from 118 nm in the ultraviolet through 8.5 microns in the infrared. The non-magnetic UHV mount is a low mu stainless steel 4.50 inch Conflat flange with magnetic permeability of less than 1.010.  It is available with a protective anodized aluminum cap for greater thermal uniformity during bake-out. It is also available with a transparent 6mm thick polycarbonate cover for safe viewing while primary window is not in service. The threaded mount mates with the protective cap or safety cover using the SM2 Lens Tube System*.