Adaptive photo-EMF based photodetectors as optimal detectors for fast displacements of light intensity patterns

Summary form only given. Three different configurations for adaptive detection of the optical phase modulation based on dynamic holography in photorefractive crystals were proposed recently (i.e. based on phase conjugation; on two-wave mixing, and on photoEMF effect. In first of these configurations the dynamic hologram plays role of a "smart retroreflector" and in the second one the hologram acts as a "smart beam-splitter". In which similar way the adaptive photoEMF photodetector can be treated? It seems that this configuration can be considered as a "smart photodiode structure" (or medium) optimally matched for detection of fast shifts of the initial 2D light pattern.