Second-order optical nonlinearity in Sb2S3 microcrystal doped glasses by electron beam irradiation

With Maker fringe measurements, the prominent second harmonic generation was observed in the sol-gel-derived Sb2S3 doped silica glasses irradiated by electron beam, which was related to the space-charge electrostatic field that makes the glasses poled and broken the centrosymmetry of the glasses. By sides, the interface of nanoparticles contributed to the second harmonic intensity as well. The second harmonic intensity increased with the increasing of the irradiating current, accelerating voltage and the concentration of the dopant due to the enhanced built-in electrostatic field. The poled region was located in the surface of the sample about several microns by the TSDC measurements. The second harmonic intensity is almost 10 times larger than that of the base glass due to the existence of microcrystal.