Title

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

Authors

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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