The dependence of the diffraction efficiency of holograms and the effective
gain of the signal wave on the polarization and orientation angles is inve
stigated for two-wave mixing in transmission geometry in cubic (1 1 1)-cut
photorefractive piezocrystals (classes 23 and (4) over bar 3m). It is shown
theoretically that maximum diffraction efficiency and gain in BSO and GaAs
depend on the orientation angle. It is confirmed experimentally for BSO cr
ystal (class 23). It is obtained theoretically and experimentally that in 2
.1 mm. thick BSO crystals the piezoelectric effect leads to an increase of
the diffraction efficiency by 70% and of the gain by 30% for certain values
of the polarization and orientation angles. (C) 2001 Elsevier Science B.V.
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