Surface second-harmonic generation inSr0.6Ba0.4NbO3with a nonlinear diffusion mechanism

Abstract

Surface second-harmonic generation excited by photorefractive surface electromagnetic wave with a diffusion mechanism of nonlinearity has been observed at the surface of the negative $c$ axis of a ${\mathrm{Sr}}_{0.6}{\mathrm{Ba}}_{0.4}{\mathrm{NbO}}_{3}$(SBN:60) experimentally. The second-harmonic $532\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ wavelength light is generated by $1064\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ laser in a passive guiding manner in the experiment, for the wavelength of the fundamental beam is insensitive to the SBN crystal. The transfer efficiency of surface second-harmonic generation is 1%/W.