Fringe contrast improvement in Twyman-Green interferometer for lens test

Hitoshi Ohashi; Yoichi Iba; Toshiro Okamura

doi:10.1117/12.132148

20 October 1992 Fringe contrast improvement in Twyman-Green interferometer for lens test

Hitoshi Ohashi, Yoichi Iba, Toshiro Okamura

Proceedings Volume 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation; (1992) https://doi.org/10.1117/12.132148
Event: International Symposium on Optical Fabrication, Testing, and Surface Evaluation, 1992, Tokyo, Japan

Abstract

With respect to the cases of observing the wavefronts passing through a lens, studies were made for improving the fringe contrast from both aspects, temporal coherence and spatial coherence, of the light sources of interferometers. Experiments based on the studies also were done, employing an excimer laser and a projection lens as the light source of a Twyman-Green interferometer and the lens under test, respectively, which the experiments showed had preferable results. There is, however, a possible problem which could occur if the lens under test is not corrected for chromatic aberration.

Citation Download Citation

Hitoshi Ohashi, Yoichi Iba, and Toshiro Okamura "Fringe contrast improvement in Twyman-Green interferometer for lens test", Proc. SPIE 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation, (20 October 1992); https://doi.org/10.1117/12.132148

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