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.