BRAGG-SHIFT OF HOLOGRAPHIC GRATINGS IN PHOTOREFRACTIVE FE-LINBO(3) CRYSTALS.
In order to obtain the maximum diffraction efficiency, holograms recorded in a photorefractive crystal must be replayed by a readout beam incident at the correct angle. The optimum angle may be shifted away from the angle used for recording by a ''Bragg-shift'', caused (under certain conditions) by phase coupling between the two writing beams during recording. Although this Bragg-shift is small, a large diffraction efficiency enhancement is obtained when the grating is read out at the optimum angle. In this paper detailed numerical calculations of the Bragg-shift are presented, based on an earlier theory, and a good agreement between theory and experiment is reported.
|Title:||BRAGG-SHIFT OF HOLOGRAPHIC GRATINGS IN PHOTOREFRACTIVE FE-LINBO(3) CRYSTALS|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
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