Anomalous photorefractive response in two-beam coupling with focused beams in photorefractive crystals and waveguides
Kaczmarek, M. and Eason, R.W. (1995) Anomalous photorefractive response in two-beam coupling with focused beams in photorefractive crystals and waveguides. Optics Communications, 113, (4-6), 550-558. (doi:10.1016/0030-4018(94)00573-D).
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We report on anomalous two-beam coupling results observed in photorefractive BaTiO3 crystals and ion-implanted wave-guides when focussed beams have been used. The two-beam coupling gain, investigated as a function of the input beam ratio, showed an enhanced magnitude, when compared with the standard theory, and exhibited a strong beam ratio dependence. In order to explain the significant difference we observed between theory and experiment, we discuss several models, based on intensity-dependent processes, and show that only a modification with the enhanced photoinduced space-charge field being a nonlinear function of modulation, has given an agreement with the experimentally determined results.
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||02 Mar 2012 11:23|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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