The non-magnetic viewports use a non-magnetic weld ring instead of the regular kovar weld ring. Flanges in 316L stainless steel are used for the high vacuum KF and ISO viewports. VacTechniche viewports are manufactured in clean room conditions and helium leak tested, cleaned and packed to UHV standards.
The rugged construction of the zinc selenide viewports allows bake-out to a maximum of 120 °C with UHV performance, whilst the window offers broadband optical transmission to extreme infrared. Options with anti-reflective coatings are also offered. Non-standard viewports can be manufactured on request, including re-entrant style microscope/camera viewports. Annealed copper gaskets and other component accessories are also supplied by VacTechniche.
Transmission Curve – Zinc Selenide