Phase-Matching In Non-Linear Waveguides: The Use Of Periodic Structures

R. Kashyap

doi:10.1117/12.949970

8 March 1989 Phase-Matching In Non-Linear Waveguides: The Use Of Periodic Structures

R. Kashyap

Proceedings Volume 1017, Nonlinear Optical Materials; (1989) https://doi.org/10.1117/12.949970
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

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.

Citation Download Citation

R. Kashyap "Phase-Matching In Non-Linear Waveguides: The Use Of Periodic Structures", Proc. SPIE 1017, Nonlinear Optical Materials, (8 March 1989); https://doi.org/10.1117/12.949970

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