Abstract
Very high conversion efficiency of the Cerenkov second harmonic generation in a nonlinear optical waveguide is demonstrated through numerical optimization of waveguide refractive indices, waveguide thickness, or domain-inversed period. Based on coupled-mode theory and a local-no-pump-depletion approximation, accurate results can be attained for a variety of waveguide materials. Detailed analysis permits deeper physical insight into the problems of both field overlap and the transmissivity factor which are closely determined by the dispersion properties of the waveguide medium and the domain-inversed period. Calculation for 2-(N-prolinol)-5-nitropyridine (PNP with anomalous dispersion) and 2-methyl-4-nitroaniline (MNA with normal dispersion) films yield a dramatically maximized conversion efficiency up to 90% by adjusting the waveguide thickness, refractive indices, or domain-inversed period. Rules for choosing the optimum waveguide parameters for high conversion efficiency are discussed with appropriate examples.
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