Abstract

We report on photoinduced second-harmonic generation (SHG) in chalcogenide glasses. Fundamental and second-harmonic waves from a nanosecond pulsed Nd:YAG laser were used to induce second-order nonlinearity in chalcogenide glasses. The magnitude of SHG in 20Ge·20As·60S glass was 104 larger than that of tellurite glass with a composition of 15Nb2O5·85TeO2 (mol.%). Moreover, no apparent decay of photoinduced SHG in 20Ge·20As·60S glass was observed after optical poling at room temperature. We suggest that the large and stable value of χ2 is due to the induced defect structures and large χ3 of the chalcogenide glasses.

© 2001 Optical Society of America

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