Zinc Selenide Zero Length Viewports
VacTechniche Vacuum Optics – Viewports
Zinc Selenide Zero Length Viewports
VacTechniche zinc selenide viewports are offered in CF, ISO and KF flange styles. The viewports comprise a laser quality zinc selenide optic with precise flatness, parallelism, scratch and dig specifications. The ultra high vacuum (UHV) CF versions are offered using high grade 304L or 316LN stainless steel flanges. Non-magnetic viewports are offered for low energy applications or surface science applications needing low magnetic fields.
Description
The non-magnetic viewports use a non-magnetic weld ring instead of the regular kovar weld ring. Flanges in 316L stainless steel are used for the high vacuum KF and ISO viewports. VacTechniche viewports are manufactured in clean room conditions and helium leak tested, cleaned and packed to UHV standards.
The rugged construction of the zinc selenide viewports allows bake-out to a maximum of 120 °C with UHV performance, whilst the window offers broadband optical transmission to extreme infrared. Options with anti-reflective coatings are also offered. Non-standard viewports can be manufactured on request, including re-entrant style microscope/camera viewports. Annealed copper gaskets and other component accessories are also supplied by VacTechniche.
Transmission Curve – Zinc Selenide
Specifications
| Seal Type | Bond |
| Maximum Temperature | 120 °C |
| Minimum Temperature | minus 45 °C |
| Maximum Rate of Temperature Change | 3 °C per minute |
| Leak Rate | <1×10-10 atm-cc/sec (He) |
| Pressure Range | 1 bar to 1×10-9 mbar |
| Surface Quality | 60/40 scratch/dig |
| Flatness | <2λ |
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 |
| BVPZ16ZnSe | NW16CF | 34 | 15 | 1.5 | 12.7 | 304L | Kovar | |
| BVPZ16ZnSe-LN | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Kovar | |
| BVPZ38ZnSe | NW35CF | 70 | 32 | 3 | 12.7 | 304L | Kovar | |
| BVPZ38LAZnSe | NW35CF | 70 | 38 | 3.75 | 12.7 | 304L | Kovar | |
| BVPZ38ZnSe-LN | NW35CF | 70 | 32 | 3 | 12.7 | 316LN | Kovar | |
| BVPZ38LAZnSe-LN | NW35CF | 70 | 38 | 3.75 | 12.7 | 316LN | Kovar | |
| BVPZ64ZnSe | NW63CF | 114 | 63 | 5 | 17.4 | 304L | Kovar | |
| BVPZ64ZnSe-LN | NW63CF | 114 | 63 | 5 | 17.4 | 316LN | Kovar | |
| BVPZ100ZnSe | NW100CF | 152 | 89 | 6.5 | 19.9 | 304L | Kovar | |
| BVPZ100ZnSe-LN | NW100CF | 152 | 89 | 6.5 | 19.9 | 316LN | Kovar |
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