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
Original Manuscript: March 7, 1995
Revised Manuscript: October 10, 1995
Published: February 10, 1996
Bruno Pouet and Sridhar Krishnaswamy, "Dynamic holographic interferometry by photorefractive crystals for quantitative deformation measurements," Appl. Opt. 35, 787-794 (1996)