Fused Silica UHV Viewports With Anti-Reflective Coatings
VacTechniche Vacuum Optics – Viewports
Fused Silica UHV Viewports With Anti-Reflective Coatings
VacTechniche fused silica viewports are offered with a single 1 x QWOT MgF2 layer anti-reflective (AR) coating on both sides of the window optimised to a customer specified wavelength range. Please advise the important wavelengths or wavelength range with your enquiry or order.
Wavelength ranges between 190 nm and 1550 nm can be accepted as standard, although coatings for other wavelength ranges can be quoted on request. Viewports with ‘V’ coatings for a single wavelength for laser applications and four-layer broadband low reflectance ‘BBAR’ coatings are also offered. The viewports comprise a high purity laser quality fused silica optic with precise flatness, parallelism, scratch and dig specifications.
Description
Transmission Curve – Fused Silica
Please note that the optical reflectance curves are approximations and should be used for reference only
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. The non-magnetic viewports use a non-magnetic weld ring instead of the regular kovar weld ring.
TSL viewports are manufactured in cleanroom conditions and helium leak tested, cleaned and packed to UHV standards. The rugged construction of the fused silica viewports allows repeated bake-out with UHV performance, whilst the window offers broadband optical transmission through deep UV, visible to near infra-red.
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.
Specifications
| Seal Type | Braze |
| Maximum Temperature | 200°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 | 20 /10 scratch/dig |
| Flatness | < 8λ |
| Coating | Single layer 1 x QWOT ‘AR’ coating optimised to customer specified wavelength range between 190nm and 1550nm |
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 |
| VPZ16QAR | NW16CF | 34 | 15 | 1.5 | 12.7 | 304L | Kovar | |
| VPZ16QAR-LN | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Kovar | |
| VPZ16QAR-NM | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Niobium | Yes |
| VPZ38QAR | NW35CF | 70 | 32 | 3 | 12.7 | 304L | Kovar | |
| VPZ38LAQAR | NW35CF | 70 | 38* | 3.5 | 12.7 | 304L | Kovar | |
| VPZ38QAR-LN | NW35CF | 70 | 32 | 3 | 12.7 | 316LN | Kovar | |
| VPZ38LAQAR-LN | NW35CF | 70 | 38* | 3.5 | 12.7 | 316LN | Kovar | |
| VPZ38QAR-NM | NW35CF | 70 | 32 | 3 | 12.7 | 316LN | Niobium | Yes |
| VPZ64QAR | NW63CF | 114 | 63 | 4.5 | 17.4 | 304L | Kovar | |
| VPZ64QAR-LN | NW63CF | 114 | 63 | 4.5 | 17.4 | 316LN | Kovar | |
| VPZ64QAR-NM | NW63CF | 114 | 63 | 4.5 | 17.4 | 316LN | Niobium | Yes |
| VPZ100QAR | NW100CF | 152 | 89 | 6 | 19.9 | 304L | Kovar | |
| VPZ100QAR-LN | NW100CF | 152 | 89 | 6 | 19.9 | 316LN | Kovar | |
| VPZ100QAR-NM | NW100CF | 152 | 89 | 6 | 19.9 | 316LN | Niobium | Yes |
| VPZ150QAR | NW150CF | 203 | 136 | 9.5 | 22.3 | 304L | Kovar | |
| VPZ150QAR-LN | NW150CF | 203 | 136 | 9.5 | 22.3 | 316LN | Kovar | |
| VPZ150QAR-NM | NW150CF | 203 | 136 | 9.5 | 22.3 | 316LN | Niobium | Yes |
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