Abstract

A holographic interferometer that uses two-wave mixing in a photorefractive (Bi₁₂SiO₂₀) crystal under an applied ac field is described. The interferometer uses a repetitive sequence of separate record and readout times to obtain quasi real-time holographic interferograms of vibrating objects. It is shown that a good signal-to-noise ratio of the interferometer is obtained by turning off the object illumination and the applied ac field during readout of the hologram. The good signal-to-noise ratio of the resulting holographic interferograms enables phase measurement, which allows for quantitative deformation analysis.

© 1996 Optical Society of America

Phase-shifting real-time holographic interferometry that uses bismuth silicon oxide crystals

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