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Mechanism of photorefractive enhancement of photochromic gratings in BSO - Experimental results and phenomenological modelling

Mechanism of photorefractive enhancement of photochromic gratings in BSO - Experimental results and phenomenological modelling
Mechanism of photorefractive enhancement of photochromic gratings in BSO - Experimental results and phenomenological modelling
We report an increase of more than a factor of 100 in the diffraction efficiency from photochromic gratings written in BSO by uniformly illuminating these gratings with 488 nm light to induce secondary photorefractive gratings. Upon application of an electric field, the phase shift between the two gratings can he varied and under appropriate conditions the diffraction efficiency can increase. The dependence of the enhanced diffraction efficiency as a function of the applied electric field and readout beam polarisation was experimentally investigated for two different crystal orientations. Phenomenological modelling is presented requiring modifications to the phase angle between the photochromic and induced photorefractive gratings in order to reproduce the experimentally observed asymmetry in the increase in the diffraction efficiency. This suggests a periodic modulation of the photorefractive donor/acceptor density, due to the presence of the photochromic grating.
0030-4018
357-365
Jeffrey, P.M.
c6d19a58-60a2-4bfc-9a97-0bff8399889b
Clapham, S.L.
d85f047b-54e1-4686-977e-3b75b23eb9c0
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Fish, D.A.
40af98f6-12c5-4b02-9a93-51399e225051
Powell, A.K.
c4811f93-7127-4b15-b52e-f32cfa2dbd7b
Hall, T.J.
fe7b4f98-5ab3-403a-81a0-790adb84ee5a
Vainos, N.A.
e4f22637-2f1c-4dec-af67-d059261dd5b2
Jeffrey, P.M.
c6d19a58-60a2-4bfc-9a97-0bff8399889b
Clapham, S.L.
d85f047b-54e1-4686-977e-3b75b23eb9c0
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Fish, D.A.
40af98f6-12c5-4b02-9a93-51399e225051
Powell, A.K.
c4811f93-7127-4b15-b52e-f32cfa2dbd7b
Hall, T.J.
fe7b4f98-5ab3-403a-81a0-790adb84ee5a
Vainos, N.A.
e4f22637-2f1c-4dec-af67-d059261dd5b2

Jeffrey, P.M., Clapham, S.L., Eason, R.W., Fish, D.A., Powell, A.K., Hall, T.J. and Vainos, N.A. (1993) Mechanism of photorefractive enhancement of photochromic gratings in BSO - Experimental results and phenomenological modelling. Optics Communications, 98 (4-6), 357-365.

Record type: Article

Abstract

We report an increase of more than a factor of 100 in the diffraction efficiency from photochromic gratings written in BSO by uniformly illuminating these gratings with 488 nm light to induce secondary photorefractive gratings. Upon application of an electric field, the phase shift between the two gratings can he varied and under appropriate conditions the diffraction efficiency can increase. The dependence of the enhanced diffraction efficiency as a function of the applied electric field and readout beam polarisation was experimentally investigated for two different crystal orientations. Phenomenological modelling is presented requiring modifications to the phase angle between the photochromic and induced photorefractive gratings in order to reproduce the experimentally observed asymmetry in the increase in the diffraction efficiency. This suggests a periodic modulation of the photorefractive donor/acceptor density, due to the presence of the photochromic grating.

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Published date: 1993

Identifiers

Local EPrints ID: 78506
URI: https://eprints.soton.ac.uk/id/eprint/78506
ISSN: 0030-4018
PURE UUID: 3f23f845-d78b-4e23-9669-a1ce20c72c73
ORCID for R.W. Eason: ORCID iD orcid.org/0000-0001-9704-2204

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Date deposited: 11 Mar 2010
Last modified: 06 Jun 2018 13:13

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