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Measurement of phase differences with a novelty-filter phase-step technique

We present a technique for the measurement of temporal phase differences. In this method, the holographic storage of a given wavefront in a photorefractive BaTiO3 crystal is combined with the interferometric phase-step technique. We obtain a novelty-filter phase-step method which allows for the measurement of phase changes within a unique process. The application and some features of the technique are demonstrated.