General Atomics produces vacuum windows in corrugated waveguide sealed with one or two Helicoflex® metal seals.
110 GHz vacuum window in corrugated 31.8 mm waveguide for short pulse operation. This window uses a fused silica disk with very low absorption. It is also equipped with a fiber optic arc detector.
84/168 GHz vacuum window in evacuated corrugated 31.8 mm waveguide for long pulse operation. This window uses a diamond disk with extremely low absorption. Equipped with a thermocouple to monitor disk edge temperature, with a cooling provision.
John Doane, GA-MFE Technologies