Abstract
A real-time visual approach for the calibration of phase step in image plane holography using BaTiO3 crystal as a recording medium is reported. In this method, the diffuse object is illuminated symmetrically with two collimated beams and a pump beam is added at the crystal plane. Each illuminating beam generates an individual interferogram at the observation plane when the object is subjected to load. A p phase shift to one of the illuminating beams results in the complete disappear- ance of the fringes due to phase reversal between the individual inter- ferograms, and at 2p phase change, the fringe pattern is restored. After calibration, a single-beam illumination configuration is used for phase measurement. We present the theory of the method and experimental results for a centrally loaded diaphragm rigidly clamped along the periph- ery. © 1998 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(98)01611-0)
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