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Čerenkov-radiation-type optical second-harmonic generation is analyzed by using the Green function of the Helmholtz equation, including the nonlinear-polarization term. The numerical results agree well with those of previously reported experiments. A formulation is given that provides a means of designing frequency doublers, which make use of channel waveguides and optical fibers.
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Chikuma et al. (1990) studied this question.
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