Zero Length Viewport, UV Grade Sapphire, 0.46 Inch Clear Aperture, CF 1.33 Inch, 304 Stainless Steel Flange.
Zero length ConFlat (CF) viewports are used for light transmission in ultra-high vacuum applications. The front face of the window sits flush or just below the flange, introducing zero additional length beyond the typical thickness of a conflat flange. The window is brazed or fused to a thin, folded metal ring. The brazed connection is compatible with ultra-high vacuum and the folded metal ring introduces enough flexibility that the windows do not crack during dissimilar thermal expansion between the window and flange. The brazed connection between window and metal allows these viewports to handle higher bakeout temperatures than viewports that contain O-rings. The outer conflat flange uses a copper gasket and knife-edges to achieve a high vacuum seal and can operate down to 10-13 torr.
Sapphire is a premium optics material used in a wide range of optical applications. It is highly transparent in the ultraviolet (UV), visible, and infrared regions from 150 nm to 5500 nm. UV grade sapphire has enhanced transparency in the UV compared to standard sapphire. It is extremely hard, has high strength and scratch resistance, and resists most chemicals.
Specifications:
- Window Material: Sapphire
- Mount Material: Kovar
- Flange Material: 304 Stainless Steel
- Thermal Range: -100°C to 450°C
- Leak Rate: < 1 x 10-9 atm cc sec-1 of helium
- Common Dimensions:
- A. Clear Aperture: 0.46"
- B. Window Thickness: 0.062"
- C. Flange Thickness: 0.30"
- D. Flange OD: 1.33"
- Optical:
- Transmitted Wavefront Distortion: <8λ at 632nm (peak to valley)
- Parallelism: <3 arcmin
- Surface Finish: 50/20 Scratch-Dig
- Orientation: Random
