200°C Sapphire Zero Length Viewports

VacTechniche Vacuum Optics – Viewports

200°C Sapphire Zero Length Viewports

VacTechniche sapphire viewports are offered in CF, ISO and KF flange styles. The viewports comprise a high quality optic with precise flattness, parallelism, scratch and dig specifications. The 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.

Category:

Description

C-cut sapphire is selected for VacTechniche sapphire viewports to minimise the effects of birefringence. The ultra high vacuum (UHV) CF versions are offered using high grade 304L or 316LN stainless steel anges. Non-magnetic viewports are offered for low energy applications or surface science applications needing low magnetic elds. 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.

Transmission Curve – Sapphire

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