These viewports employ a synthetic single crystal sapphire as the window material. Single crystal synthetic sapphire displays very different optical, physical and thermal characteristics depending upon the direction of the axis of the crystal structure. Sapphire viewports are offered as standard with the crystal axis at 90°, i.e. parallel to the surface of the viewport. 0° crystal orientation versions are available upon request
• UHV Compatible.
• Bakeable to 450°C.
Window : Sapphire, single crystal
Carrier : Kovar®
Flanges : St.St.
Max. Bakeout Temperature* :
CF flanged viewports : 250°C
KF flanged viewports : 150°C
Weldable viewports : 450°C
Max. Thermal Gradient : 25°C per minute
Crystal orientation : 0°
Surface finish : 20/10 scratch/dig
UV transmission @ 248nm (internal) : 99.8%
parallelism : <10 arc seconds
Homogeneity grade : A
Inclusion class : 0
* – Assembly rating is reduced to that of the lowest rated component.