Theory of Volume Hologram Formation in Photorefractive Crystals
Holograms, or gratings, in photorefractive crystals have been widely investigated ever since CHEN, LAMACCHIA and FRAZER  performed their experiments in 1968. Besides, holography proper, a host of new devices have been developed of which other lecturers will speak. My aim is here rather limited. I wish to discuss the phenomena which occur when a photorefractive crystal is illuminated by two symmetrically incident beams as shown schematically in Fig. 1. Note that a d.c. voltage may also be applied across the crystal.
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