Multiplexing dynamic holograms in a cubic photorefractive crystal

Usage of dynamic (PR) holograms in optical and fiber-optical measurement systems makes them adaptive, i.e. capable to operate in unstable environment and reliably detect ultra-small physical quantities [1]. At the same time holograms multiplexing techniques are required for development of a multidimensional measurement system consisting of a large number of sensors. Known multiplexing techniques are based on mutual incoherency of mixed waves [2], using different wavelengths [3] or selective holograms enhancement by application of external electric field to PR crystal [4]. Complexity of the measurement system based on the mentioned techniques (especially related to high voltage requirements) reduces the system's performance or its practical applications range. In this work we proposed a simple and highly efficient approach to multiplexing several dynamic reflection holograms of diffusion type in a single PR crystal using a single reference beam.