Coating Witness

1T Optics witness samples be polished one side or both surfaces according to the customers’ requirement to be used meet for transmit or reflect thin film coating

Coating WitnessDescription

Coating on different optical surfaces, including spherical, aspherical, planar, etc., but how to better detect the performance of thin film? The usual landscape photometer detection systems are suitable for plane detection, from which the witness samples are derived. Through the witness sample, the transmittance, reflectivity, actual applicable temperature, moderate and so on of the film can be detected.

The witness samples provided by 1T Optics include a full range of brands such as CDGM, Schott, CORNING, etc. The general diameter is about 1” and the thickness is 1-3mm, which basically adapts to the size of standard spectrophotometer tools.

Diameter 20mm-25.4mm
Thickness 1mm-3mm
Clear aperture > 85% of diameter
Surface quality 60/40 or better
Parallelism <3 arc min or better
Flatness λ/4  – λ/10@633nm
Edges Fine ground
Beveled <0.2mm x 45deg

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