Non-Steady-State PhotoEMF in Crystals with Long Relaxation Times of Photoconductivity,
AKADEMIYA NAUK SSSR LENINGRAD FIZIKO-TEKHNICHESKII INSTITUT
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The recently discovered effect of non-steady-state photoEMF is a powerful technique for the measurement of different parameters of photorefractive crystals. The photoEMF is observed as an alternating electric current J to the omega through a short-circuited sample of photoconductor illuminated by a vibrating pattern of interference between two coherent waves, one of-which is phase modulated with frequency omega. It results from a periodic modulation of the spatial shift between the distribution of photoconductivity that follows movements of the interference pattern and the distribution of the space-charge electric field recorded through the conventional diffusion holographic mechanism in photorefractive crystals.
- Electricity and Magnetism