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Optical Engineering

Near-real-time phase difference amplification using multiple-beam interferometry and a liquid-crystal-phase-only spatial light modulator
Author(s): Kiyofumi Matsuda; Geoffrey T. Bold; Tomas H. Barnes; Tomoaki Eiju; Chander Prakash Grover; Colin J. R. Sheppard
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Paper Abstract

Phase difference amplification is a technique used to produce a fringe contour map in which the optical path difference between one fringe and the next is a fraction of a wavelength. To ensure high accuracy of the technique, it is usually necessary to generate interference between the high-order diffracted beam and its conjugate beam by means of a holographic recording material that provides sufficiently large nonlinearity to record the original fringe pattern from the test object. This paper shows that not only the nonlinearity of the recording material, but also multiple-beam interference, can be used to produce high-order diffracted beams. A Tolansky-type multiple-beam interferometer has been used in conjunction with an optically addressed liquid-crystal spatial light modulator to set up a system that functions in near real time and provides high accuracy.

Paper Details

Date Published: 1 December 2003
PDF: 8 pages
Opt. Eng. 42(12) doi: 10.1117/1.1623285
Published in: Optical Engineering Volume 42, Issue 12
Show Author Affiliations
Kiyofumi Matsuda, National Research Council Canada (Canada)
Geoffrey T. Bold, Univ. of Auckland (New Zealand)
Tomas H. Barnes, Univ. of Auckland (New Zealand)
Tomoaki Eiju, National Institute of Advanced Industrial Science (Japan)
Chander Prakash Grover, National Research Council Canada (Canada)
Colin J. R. Sheppard, Univ. of Sydney (Australia)

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