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Optical Engineering

Nonuniform and off-axis structures for photorefractive waveguides in lithium niobate
Author(s): Osamu Matoba; Kazuyoshi Itoh; Yoshiki Ichioka
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Paper Abstract

Photorefractive waveguides that are optically modifiable can be used as the adaptive interconnection channels for optical neural networks. We investigate experimentally a refined fabrication method for the photorefractive waveguides in a lithium niobate crystal. The experimental results show that nonuniform illumination by a discontinuous movement of the focus can fabricate a better optical waveguide than uniform illumination by a continuous one. The discontinuous movement of the focus reduces the spatial overlap between the successive exposures, and avoids the redistribution of the space-charge density formed previously. This refinement results in a narrower and clearer index distribution of the waveguide. We further show that good waveguides are fabricated if the focus is scanned in a particular scanning direction that makes a small angle with the plane perpendicular to the c axis of the crystal.

Paper Details

Date Published: 1 August 1996
PDF: 7 pages
Opt. Eng. 35(8) doi: 10.1117/1.600823
Published in: Optical Engineering Volume 35, Issue 8
Show Author Affiliations
Osamu Matoba, Osaka Univ. (Japan)
Kazuyoshi Itoh, Osaka Univ. (Japan)
Yoshiki Ichioka, Osaka Univ. (Japan)

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