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Proceedings Paper

Polarization self-modulation effect in photoconductive electro-optic crystals
Author(s): Alexei A. Kamshilin
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Paper Abstract

Inhomogeneous illumination of any photoconductive crystal results in the formation of the space-charge field, which is a replica of the intensity distribution. If the crystal also possesses the electro-optic effect, the polarization state of the intensity pattern becomes spatially modulated since the pattern propagates in the self-induced non-uniform electric field. The polarization self-modulation has essentially three- dimensional character. After propagation the crystal of proper thickness, the polarization state of the transmitted light wave can vary from linear through circular to linear orthogonal in spite of the initial polarization being strictly uniform. This modulation can be readily visualized by installation of a polarization analyzer after the crystal. The polarization self-modulation is very important for correct description of nonlinear interaction of light waves in photorefractive crystals. Moreover, it has an important practical application for design of adaptive sensors of speckle-pattern displacements and adaptive interferometers capable to measure transient displacement of rough surfaces with sensitivity approaching to the classical homodyne interferometer.

Paper Details

Date Published: 8 August 2001
PDF: 8 pages
Proc. SPIE 4513, Optoelectronic Information Systems and Processing, (8 August 2001); doi: 10.1117/12.435893
Show Author Affiliations
Alexei A. Kamshilin, Univ. of Joensuu (Finland)

Published in SPIE Proceedings Vol. 4513:
Optoelectronic Information Systems and Processing
Yuri N. Kulchin; Oleg B. Vitrik, Editor(s)

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