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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Description/Abstract

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.

Item Type: Article
Additional Information:
ISSNs: 0030-4018 (print)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78422
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:59
URI: http://eprints.soton.ac.uk/id/eprint/78422

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