VIEWPORTS
Sapphire Viewports Zero Length 200°C
Vac Techniche
Sapphire viewports of Vac Techniche are offered in CF, ISO, and KF flange styles. The viewports comprise a high-quality optic with precise flatness, parallelism, and scratch and dig specifications. Single crystal sapphire windows have excellent optical, physical, and chemical properties.
The hardest of the oxide crystals, sapphire retains its high strength at high temperatures. Sapphire has a low coefficient of thermal expansion and, low fluorescence, good resistance to thermal shock and scratching, making this an excellent material for IR transmitting optics and robust applications.
Description
C-cut sapphire is selected for VacTechniche sapphire viewports to minimize the effects of birefringence. The ultra-high vacuum (UHV) CF versions are offered using high-grade 304L or 316LN stainless steel ranges. Non-magnetic viewports are offered for low energy applications or surface science applications needing low magnetic fields. The non-magnetic viewports use a non-magnetic weld ring instead of he regular kovar weld ring. Flanges in 316L stainless steel are used for the high vacuum KF and ISO viewports. VacTechniche viewports are manufactured in cleanroom conditions and helium leak tested, cleaned, and packed to UHV standards.
The rugged construction of the sapphire viewports allows repeated bake-out to 200 °C with UHV performance, whilst the window offers broadband optical transmission through vacuum UV, visible to near-infrared. Various anti-re ective coatings to match customer re ectance requirements are processed at VacTechniche nd available as options listed in the AR-coated viewport data sheets. Non-standard viewports can be manu- actured on request, including re-entrant style microscope/camera viewports. Annealed copper gaskets and other component accessories are also supplied by VacTechniche.
Specifications
Seal Type | Braze |
Maximum Temperature | 200°C (KF & ISO versions 150°C) |
Minimum Temperature | minus 20°C |
Maximum Rate of Temperature Change | 3°C per minute |
Leak Rate | <1×10-10 atm-cc/sec (He) |
Pressure range | 1 bar to 1×10-11 mbar |
Surface quality | 60 /40 scratch/dig |
Flatness | < 8λ |
Cross Sections / Diagrams
PARTS & VARIATIONS
PART NUMBER | FLANGE TYPE | OD MM | VIEW DIAMETER MM | OPTIC THICKNESS MM | FLANGE THICKNESS MM | FLANGE MATERIAL | WELD RING MATERIAL | NON-MAGNETIC |
|---|---|---|---|---|---|---|---|---|
VPZ16S-200 | NW16CF | 34 | 15 | 1.5 | 12.7 | 304L | Kovar | |
VPZ16S-LN-200 | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Kovar | |
VPZ16S-NM-200 | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Niobium | Yes |
VPZ23S-200 | NW35CF | 70 | 23 | 1.5 | 12.7 | 304L | Kovar | |
VPZ38S-200 | NW35CF | 70 | 32 | 1.5 | 12.7 | 304L | Kovar | |
VPZ38LAS-200 | NW35CF | 70 | 38 | 1.5 | 12.7 | 304L | Kovar | |
VPZ38S-LN-200 | NW35CF | 70 | 32 | 1.5 | 12.7 | 316LN | Kovar | |
VPZ38LAS-LN-200 | NW35CF | 70 | 38 | 1.5 | 12.7 | 316LN | Kovar | |
VPZ38S-NM-200 | NW35CF | 70 | 32 | 1.5 | 12.7 | 316LN | Niobium | Yes |
VPZ64S-200 | NW63CF | 114 | 63 | 2 | 17.4 | 304L | Kovar | |
VPZ64S-LN-200 | NW63CF | 114 | 63 | 2 | 17.4 | 316LN | Kovar | |
VPZ64S-NM-200 | NW63CF | 114 | 63 | 2 | 17.4 | 316LN | Niobium | Yes |
VPZ100S-200 | NW100CF | 152 | 89 | 2.5 | 19.9 | 304L | Kovar | |
VPZ100S-LN-200 | NW100CF | 152 | 89 | 2.5 | 19.9 | 316LN | Kovar | |
VPZ100S-NM-200 | NW100CF | 152 | 89 | 2.5 | 19.9 | 316LN | Niobium | Yes |
VPZ150S-200 | NW150CF | 203 | 136 | 4 | 22.3 | 304L | Kovar | |
VPZ150S-LN-200 | NW150CF | 203 | 136 | 4 | 22.3 | 316LN | Kovar | |
VPZ150S-NM-200 | NW150CF | 203 | 136 | 4 | 22.3 | 316LN | Niobium | Yes |