Evaluation of optical parameters of quasi-parallel plates with single-frame interferogram analysis methods

Zofia Sunderland, Krzysztof Patorski, Krzysztof Pokorski


The surface flatness of transparent plates is frequently tested in Fizeau and Twyman-Green interferometers. In case of quasi-parallel plates, however, a common problem is the additional reflection from the plate rear surface and three-beam interference is encountered. Our new method of deriving shape and optical thickness variations of the plate requires recording two interferograms: a two-beam interferogram without a reference beam and the three-beam interference one. The images are processed using single-frame techniques only. The proposed method does not require modification of a sample or sophisticated equipment and complicated data analysis.

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
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ISSN: 2080-2242