Second-harmonic generation and cascaded nonlinearity in titanium-indiffused lithium niobate channel waveguides

    Authors

    R. Schiek; Y. S. Baek;G. I. Stegeman

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. B-Opt. Phys.

    Keywords

    SPATIAL SOLITARY WAVES; 2ND-ORDER NONLINEARITY; PHASE-SHIFTS; GUIDES; INTERFEROMETER; PLANAR; KTP; Optics

    Abstract

    We summarize and discuss the results of our second-harmonic generation experiments in titanium-indiffused lithium niobate optical channel waveguides. The wave-vector mismatch in the nonlinear wave interaction was varied with temperature tuning around the second-harmonic resonances. Fundamental depletion and second-harmonic tuning curves show a strong power dependence, which is an indication of an intensity-dependent wave-vector modification of the interacting modes. This nonlinear refractive effect (which is called cascaded nonlinearity) is characterized with interferometric measurements of the resulting nonlinear phase shift of the fundamental. Large nonlinear phase shifts ( > 2 pi) appear in regions of low fundamental depletion ( < 10%) because of a nonuniform wave-vector mismatch along the waveguide. At resonance a maximum fundamental depletion of more than 90% was observed. Al the measured results are explained well theoretically with a coupled-mode model that has proved to be a reliable design tool for fabricating waveguide devices for applications of the cascaded nonlinearity. (C) 1998 Optical Society of America [S0740-3224(98)00608-0] OCIS codes: 190.0190, 190.2620, 130.3730, 130.2790.

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    15

    Issue/Number

    8

    Publication Date

    1-1-1998

    Document Type

    Article

    Language

    English

    First Page

    2255

    Last Page

    2268

    WOS Identifier

    WOS:000075268100009

    ISSN

    0740-3224

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