Abstract
The structure and operation of a holographic interferometer that uses photorefractive Bi12TiO20 crystals as reusable recording mate- rials and computer image processing for rapid and precise interpretation of the fringe patterns are discussed. Different types of two-wave and four-wave mixing were applied to optical testing by double-exposure ho- lographic interferometry. A very convenient matching was found in the phase-conjugation setup for the Bi12TiO20 crystals and usual He-Ne la- sers, when the exposures were of ;10 s for light energy densities of 4310 23 W/cm 2 . Simple algorithms and direct spatial phase reconstruc- tion were used for computer image processing of the fringe patterns. © 1996 Society of Photo-Optical Instrumentation Engineers. Subject terms: real-time holographic interferometry; optical phase conjugation; photorefractive materials; fringe image processing; direct spatial phase demodu- lation.
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