Fused Silica UHV Laser Viewports With ‘VAR’ Anti-Reflective Coatings
VacTechniche Vacuum Optics – Viewports
Fused Silica UHV Laser Viewports With ‘VAR’ Anti-Reflective Coatings
VacTechniche laser viewports are offered with a two-layer ‘VAR’ anti-reflective coating on both sides of the window optimised to a customer specified laser wavelength. The coating reduces reflection to below 0.5% per face or 1% total at the wavelength specified. Please advise the laser wavelength with your enquiry or order.
Wavelengths between 240 nm and 1550 nm can be accepted as standard, although coatings for other wavelengths can be quoted on request. Viewports with coatings or a wavelength range can also be offered. The viewports comprise a high purity laser quality fused ilica 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.
Description
Reflectance Curve
Please note that the optical reflectance curves are approximations and should be used for reference only.
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. VacTechniche viewports are manufactured in clean room conditions and helium leak tested, cleaned and packed to UHV standards.
The rugged construction of the fused silica viewports allows epeated bake-out with UHV performance, whilst the window offers broadband optical transmis- ion through deep UV, visible to near infrared. 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 |
| Laser Damage Threshold | 2 J/cm2 at 530nm (note, varies with wavelength, laser type and cleanliness of optic) |
| Coating | 2-layer ‘VAR’ coating optimised to customer specified wavelength between 240nm and 1550nm |
| Reflectance | < 0,5% per face 1% total at the specified wavelength |
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 |
| VPZ16QVAR | NW16CF | 34 | 15 | 1.5 | 12.7 | 304L | Kovar | |
| VPZ16QVAR-LN | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Kovar | |
| VPZ16QVAR-NM | NW16CF | 34 | 15 | 1.5 | 12.7 | 316LN | Niobium | Yes |
| VPZ38QVAR | NW35CF | 70 | 32 | 3 | 12.7 | 304L | Kovar | |
| VPZ38LAQVAR | NW35CF | 70 | 38* | 3.5 | 12.7 | 304L | Kovar | |
| VPZ38QVAR-LN | NW35CF | 70 | 32 | 3 | 12.7 | 316LN | Kovar | |
| VPZ38LAQVAR-LN | NW35CF | 70 | 38* | 3.5 | 12.7 | 316LN | Kovar | |
| VPZ38QVAR-NM | NW35CF | 70 | 32 | 3 | 12.7 | 316LN | Niobium | Yes |
| VPZ64QVAR | NW63CF | 114 | 63 | 4.5 | 17.4 | 304L | Kovar | |
| VPZ64QVAR-LN | NW63CF | 114 | 63 | 4.5 | 17.4 | 316LN | Kovar | |
| VPZ64QVAR-NM | NW63CF | 114 | 63 | 4.5 | 17.4 | 316LN | Niobium | Yes |
| VPZ100QVAR | NW100CF | 152 | 89 | 6 | 19.9 | 304L | Kovar | |
| VPZ100QVAR-LN | NW100CF | 152 | 89 | 6 | 19.9 | 316LN | Kovar | |
| VPZ100QVAR-NM | NW100CF | 152 | 89 | 6 | 19.9 | 316LN | Niobium | Yes |
| VPZ150QVAR | NW150CF | 203 | 136 | 9.5 | 22.3 | 304L | Kovar | |
| VPZ150QVAR-LN | NW150CF | 203 | 136 | 9.5 | 22.3 | 316LN | Kovar | |
| VPZ150QVAR-NM | NW150CF | 203 | 136 | 9.5 | 22.3 | 316LN | Niobium | Yes |
| VPZ150QVAR-NM | NW150CF | 203 | 136 | 9.5 | 22.3 | 316LN | Niobium | Yes |
Related products
Viewports
Viewports
Viewports
Viewports
Viewports