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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CWO1

Direct measurement of the amplitude and phase of photorefractive fields

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Abstract

The charge transport process in photorefractive media is traditionally investigated by exposing the crystal to the interference pattern of two beams. The induced photorefractive space charge field produces a phase grating via the linear electro-optic effect. The diffraction efficiency of the grating and induced beam coupling are measured. The amplitude and phase of the photorefractive space charge field are then estimated using complex analytical models. The phase of a previously recorded photorefractive field may be indirectly measured by externally adjusting the relative spatial shift between the incident light pattern and the space charge field. Maximum energy transfer between the two beams occurs when the sum of external phase shift and the phase of the photorefractive field is 90°.

© 1991 Optical Society of America

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