Abstract

A new method using a four-layered optical waveguide consisting of both nonlinear and linear materials with normal material dispersions to realize efficient nonlinear interactions is described. Numerical examples and experimental results are also presented for the case of SHG in a glass–ZnS–TiO2–air waveguide with complete phase matching at the TE0 fundamental and TM1 harmonic wavelengths obtained using an optical parametric oscillator. This method improves the conversion efficiency more than 40 times compared with the optimized conventional three-layered nonlinear waveguide to TE0 fundamental and TM2 harmonic together with the thickness tolerance for the phase matching.

© 1978 Optical Society of America

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