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Proceedings Paper

Phase-Matching In Non-Linear Waveguides: The Use Of Periodic Structures
Author(s): R. Kashyap
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Paper Abstract

Guided-wave parametric interactions require the matching of phase-velocities of the interacting waves. Often this is possible only by using the inherent birefringence in the waveguide to offset material dispersion, as in the case of LiNbO3. This places very severe tolerances on the guide dimensions and tends to reduce the effective length of a practical device. An alternative technique is to use waveguides with spatially periodic properties to allow cancellation of phase-mismatch. Periodic structures are commonplace in conjunction with waveguides, either as passive wavelength filters or as linear electro-optic mode-converters. In this paper, recent results on the use of a periodic structure for phase matched harmonic generation in isotropic single-mode fibres are presented. We have observed second-harmonic generation by applying a static-electric field across silica optical fibres to induce a centre of asymmetry. Phase-matching between all propagating modes has also been demonstrated by using a periodic structure. Experimentally, a metal overlay periodic-electrode is rotated to select a particular mode-interaction for frequency doubling. This powerful technique can allow phase-matching in non-linear waveguides, even with a very large phase-mismatch, and is applicable to many types of non-linear inorganic, organic-crystalline/polymeric or glassy materials.

Paper Details

Date Published: 8 March 1989
PDF: 4 pages
Proc. SPIE 1017, Nonlinear Optical Materials, (8 March 1989); doi: 10.1117/12.949970
Show Author Affiliations
R. Kashyap, British Telecom Research Laboratories (United Kingdom)

Published in SPIE Proceedings Vol. 1017:
Nonlinear Optical Materials
Gerald Roosen, Editor(s)

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