Abstract
Optical second harmonic generation (SHG) in the form of Cerenkov radiation from a planar waveguide is analyzed in detail by a coupled-mode theory, where a fundamental wave is taken as a guided mode, and a second harmonic wave is taken as a substrate radiation mode. An approximate solution is given which expresses the SHG efficiency in terms of waveguide parameters such as refractive indexes, a waveguiding layer thickness, and the optical nonlinearities of a waveguiding layer and a substrate. Numerical examples are plotted for LiNbO/sub 3/ crystals. Finally, the significant effect of a periodic modulation of the sign of an optical nonlinear d constant is discussed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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