Abstract

Noncollinearly phase-matched second-harmonic generation (SHG) in a thin-film waveguide has been analyzed by the normal-mode analysis technique. When the waveguide film is composed of a poled polymer, three non-collinear SHG processes are possible. For each process a simple formula for SHG efficiency is given in terms of waveguide and nonlinear-optical parameters. Computational examples are plotted for the waveguide film of stilbene-dye-substituted methacrylate polymer on a glass substrate. The calculated matching angle and efficiency agree fairly well with the measured values. The analysis shows that the efficiency can be increased as much as 1%/W when we use the ${\text{TM}}_0^{\omega }-{\text{TM}}_1^{2\omega }$ process and that the introduction of a channel-waveguide geometry is effective in increasing the efficiencies.

© 1993 Optical Society of America

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