Anomalous photorefractive response in two-beam coupling with focused beams in photorefractive crystals and waveguides
Anomalous photorefractive response in two-beam coupling with focused beams in photorefractive crystals and waveguides
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.
550-558
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
1995
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
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), .
(doi:10.1016/0030-4018(94)00573-D).
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.
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Published date: 1995
Identifiers
Local EPrints ID: 78422
URI: http://eprints.soton.ac.uk/id/eprint/78422
ISSN: 0030-4018
PURE UUID: 0d4c0259-4125-4053-ad3f-197faf1c6e8b
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Date deposited: 11 Mar 2010
Last modified: 07 Oct 2020 03:03
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