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30 October 1997 Application of a liquid crystal lens to a double-focusing common-path interferometer
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Abstract
Uniaxial crystal properties can easily be obtained by using a nematic liquid crystal (LC) with suitable substrate treatment.A liquid crystal lens, which has bifocal properties, is fabricated wit a concave lens and a pane substrate to attain a convex lens shape LC layer, and is used as the key component of the double focusing interferometer. Liquid crystal materials are selected for the refractive index matching between the plano-concave lens and no value of the LC material. In this case, an incident ordinary ray as a test beam passes just through the lens without focusing. On the other hand, an extraordinary ray as a reference beam is focusing on the test piece with the same general path, and the common path configuration can easily be achieved. Basic properties as a novel optical test system using the LC lens are demonstrated, and it is confirmed that a thickness of an Al evaporated film can successfully be measured by introducing phase shifting technique.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshiaki Nose, Shin Masuda, and Susumu Sato "Application of a liquid crystal lens to a double-focusing common-path interferometer", Proc. SPIE 3143, Liquid Crystals, (30 October 1997); https://doi.org/10.1117/12.279265
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