Articles

Nonuniform and off‐axis structures for photorefractive waveguides in lithium niobate

[+] Author Affiliations
Yoshiki Ichioka

Osaka University Graduate School of Engineering Department of Applied Physics Yamadaoka 2-1 Suita Osaka 565, Japan

Opt. Eng. 35(8), 2175-2181 (Aug 01, 1996). doi:10.1117/1.600823
History: Received Jan. 23, 1996; Revised Mar. 8, 1996; Accepted Mar. 11, 1996
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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. © 1996 Society of Photo−Optical Instrumentation Engineers.


Citation

Osamu Matoba ; Kazuyoshi Itoh and Yoshiki Ichioka
"Nonuniform and off‐axis structures for photorefractive waveguides in lithium niobate", Opt. Eng. 35(8), 2175-2181 (Aug 01, 1996). ; http://dx.doi.org/10.1117/1.600823


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