In a study concerned with second-harmonic generation at grating couplers, Kull
et al. [Opt. Lett. 16, 1930
(1991)] observed a curious phenomenon in which the second-harmonic
efficiency exhibits dips, instead of peaks, when the angle of incidence of the
pump beam is scanned through its resonant value. This surprising result has not
been explained. It is our aim to show that this effect is closely related to the
existence of nonlinear zeros.
© 1995 Optical Society of America
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