Phase stabilization system for holographic optical data processing

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Abstract
Routine passive techniques such as temperature and air current control are frequently not adequate to provide interference fringe stabilization in holographic optical data processing experiments. A successful active phase stabilization system that can be adapted to a variety of experimental configurations is described. It utilizes a synchronous lock-in amplifier and an electrooptic phase modulator to provide real-time stabilization of the interference fringe pattern. Both a video detection method and a direct optical detection method are experimentally evaluated in conjunction with the phase stabilization system.