Fused Silica UV Viewports


Fused silica viewports offer increased transmission of UV and IR wavelengths. We offer fused silica viewports in three grades; UV grade with window material HPFS® fused silica standard grade, DUV grade with window material HPFS®fused silica KrF grade, and Excimer UV with window material HPFS® fused silica ArF grade. We also offer a range of anti-reflection coated fused silica viewports which have an anti-reflective coating applied to both sides of the vacuum window, achieving maximised transmission for various laser types.

• UHV compatible.
• Synthetic fused silica
• Weldable versions available.

Window : Corning HPFS® 7980 fused silica
Carrier : St.St.
Flanges : St.St.

Max. Bakeout Temperature* : 
CF flanged viewports : 200°C
KF flanged viewports : 150°C
Weldable viewports : 200°C

Max. Thermal Gradient : 25°C per minute

Optical properties
Surface finish : 40/20 scratch/dig
UV transmission @ 250nm (external) : >90%
parallelism : <30 arc minutes
Homogeneity grade : F
Inclusion class : 2
* – Assembly rating is reduced to that of the lowest rated component.