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Bonded Fused Silica Zero Length
A viewports are offered in CF, ISO and KF flange styles. The viewports comprise a high purity laser quality fused silica optic with precise flatness, parallelism, scratch and digspecifications. The ultra high vacuum (UHV) CF versions are offered using high grade 304L or 316LN stainless steel flanges.
- Description
- Specifications
- Transmission Curve - Fused Silica
- Additional Details
- Options
Description
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. Flanges in 304L stainless steel are used for the high vacuum KF and ISO viewports. TSL viewports are manufactured in cleanroom conditions and helium leak tested, cleaned and packed to UHV standards. The bonded construction of the fused silica viewports allows repeated bake-out to a maximum of 120 °C with UHV performance, whilst the window offers broadband optical transmission through deep UV, visible to near infra-red. Various anti-reflective coatings to match customer reflectance requirements are processed at TSL and available as options listed in the AR coated viewport section of the catalogue. Laser viewports with a VAR coating optimised for specific customer specified laser wavelength, reducing reflectance to below 0.5% per face, 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 TSL.
| Property | Value |
|---|---|
| Seal Type | Bonded |
| 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 | 20/10 scratch/dig |
| Parallelism | < 3 arc minutes |
| Flatness | λ/8 at 632.8 nm |
| Laser Damage Threshold | CW Continuous Wave – 500 W/cm2 at 530 nm Pulsed 2 J/cm2 at 530 nm and 10 ns pulse width (note, varies with wavelength, pulse width, laser type and cleanliness of optic) |
