Silica glass with SnO2 nanocrystals, obtained from sol-gel synthesis and thermal densification at 1100°C, was poled by means of a two-step process consisting of infrared 1064 nm laser irradiation followed by 532 nm laser exposure in high-voltage static electric field. Maker fringe experiments were then carried out at 1064 nm. The results show the formation of second-order nonlinearity with macroscopic nonlinear thickness (about 1 mm) and nonlinear susceptibility comparable with thermally poled silica (about 0.1 pm/V). Photoluminescence measurements suggest that mechanisms for this process should involve the activation and anisotropic ionization of defects at the interface between nanocrystals and glass.
Paleari, A., Brovelli, S., Lorenzi, R., Chiodini, N., Spinolo, G. (2007). Second harmonic generation from bulk glassceramics containing laser-poled dielectric nanocrystals. In Proceedings of SPIE - The International Society for Optical Engineering. SPIE [10.1117/12.722833].
Second harmonic generation from bulk glassceramics containing laser-poled dielectric nanocrystals
PALEARI, ALBERTO MARIA FELICE;BROVELLI, SERGIO;LORENZI, ROBERTO;CHIODINI, NORBERTO;SPINOLO, GIORGIO MARIO
2007
Abstract
Silica glass with SnO2 nanocrystals, obtained from sol-gel synthesis and thermal densification at 1100°C, was poled by means of a two-step process consisting of infrared 1064 nm laser irradiation followed by 532 nm laser exposure in high-voltage static electric field. Maker fringe experiments were then carried out at 1064 nm. The results show the formation of second-order nonlinearity with macroscopic nonlinear thickness (about 1 mm) and nonlinear susceptibility comparable with thermally poled silica (about 0.1 pm/V). Photoluminescence measurements suggest that mechanisms for this process should involve the activation and anisotropic ionization of defects at the interface between nanocrystals and glass.
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