Kodial Zero Length Viewports With Anti-Reflective Coatings

VacTechniche Vacuum Optics – Viewports

Kodial Zero Length Viewports With Anti-Reflective Coatings

VacTechniche Kodial 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 wave length applications and four layer broadband low reflectance ‘BBAR’ coatings are also offered. VacTechniche Kodial viewports are offered in CF, ISO and KF flange styles.



Reflectance Curve – Kodial

The graph here shows typical before and after transmission effect of ‘AR’, ‘VAR’, and BBAR’ anti-reflective coatings on Kodial Viewports. Customers should specify wavelength range of application with their enquiry.

Please note that the optical reflectance curves are approximations and should be used for reference only.

The viewports comprise a borosilicate glass optic which is sealed to a Kovar weld ring using an induction heater process. The optic assemblies are TIG welded in to flanges and are helium leak tested and cleaned for ultra high vacuum (UHV) conditions.

The CF versions are offered using 304L or 316LN stainless steel flanges. Flanges in 316L stainless steel are used for the high vacuum KF and ISO viewports. The rugged construction of the Kodial viewports allows repeated bake out with UHV performance, whilst the window offers broadband optical transmission from the visible to near infrared. Anti-reflective coatings to match customer reflectance requirements are also processed at VacTechniche.

Please advise the wavelength or wavelength ranges of your application and a reflectance curve will be prepared. Nonstandard 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.


Seal Type Induction
Maximum Temperature 350°C (KF 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
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
VPZ16AR NW16CF 34 15 1 12.7 304L Kovar
VPZ16AR-LN NW16CF 34 15 1 12.7 316LN Kovar
VPZ38AR NW35CF 70 32 2.5 12.7 304L Kovar
VPZ38LAAR NW35CF 70 38* 3 12.7 304L Kovar
VPZ38AR-LN NW35CF 70 32 2.5 12.7 316LN Kovar
VPZ38LAAR-LN NW35CF 70 38* 3 12.7 316LN Kovar
VPZ64AR NW63CF 114 63 3 17.4 304L Kovar
VPZ64LAAR NW63CF 114 65 3.5 17.4 304L Kovar
VPZ64AR-LN NW63CF 114 63 3 17.4 316LN Kovar
VPZ100AR NW100CF 152 89 4 19.9 304L Kovar
VPZ100AR-LN NW100CF 152 89 4 19.9 316LN Kovar
VPZ150AR NW150CF 203 136 6.5 22.3 304L Kovar
VPZ150AR-LN NW150CF 203 136 6.5 22.3 316LN Kovar

*Note that the position of the optic in the VPZ38LA design results in the coating being effective over the central >30mm only.