Abstract

We consider the possibility of generating second-harmonic radiation by the interaction of two counter-propagating fundamental waves in a quasi-phase-matched second-order nonlinear medium in a waveguide. The conversion efficiency reaches a maximum at an optimum pump intensity. For a large range of pump intensities below a certain pump intensity the efficiency is larger than that for the copropagating configuration. The saturation intensities at which the efficiency reaches 72% for poled KTiOPO4 and LiNbO3 can be achieved with lasers now available.

© 1996 Optical Society of America

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