Abstract
The laser-induced domain nucleation effect is investigated in the 3mol% hafnium-doped congruent lithium niobate crystal. The beam from an Ar-ion laser with 514 nm wavelength is focused on z surface. Two incidence schemes are performed: (1) irradiating near and focusing on the +z surface; (2) irradiating near and focusing on the -z surface. The formed space charge field is observed by the in-situ phase mapping during the laser-induced domain nucleation. The variations of phase distributions are reconstructed by the digital holographic interferometry. The light intensity dependence of the measured photovoltaic current density j phv is described. The space charge field along -z direction is thought to be an important mechanism for the laser-induced domain nucleation. According to these experimental results, we present a qualitative model on the laser-induced domain nucleation process in lithium niobate crystal.
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