Real‐time holographic interferometry using optical phase conjugation in photorefractive materials and direct spatial phase reconstruction

The structure and operation of a holographic interferometer that uses photorefractive Bi12TiO20 crystals as reusable recording materials 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 holographic interferometry. A very convenient matching was found in the phase-conjugation setup for the Bi12TiO20 crystals and usual He-Ne lasers, when the exposures were of ~10 s for light energy densities of 4×10-3W/cm2. Simple algorithms and direct spatial phase reconstruction were used for computer image processing of the fringe patterns.

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