Abstract

We observed backward second-harmonic and backward third-harmonic generation in a periodically poled KTiOPO4 waveguide using nanosecond laser pulses. The highest conversion efficiency achieved for the backward second-harmonic generation, occurring at the 25th-order grating, was 0.6%. The backward third-harmonic generation was the result of mixing the pump beam with the forward or the backward second-harmonic beam. Conversion efficiency of 0.4% was achieved at a pump wavelength of 1233.7  nm, where the two constituent nonlinear processes are both quasi-phase matched.

© 1999 Optical Society of America

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