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 20Gė20A⋅60S glass was 10<sup>4</sup> larger than that of tellurite glass with a composition of 15Nb<sub>2</sub>O <sub>5</sub>˙85TeO<sub>2</sub> (mol.%). Moreover, no apparent decay of photoinduced SHG in 20Gė20A⋅60S glass was observed after optical poling at room temperature. We suggest that the large and stable value of χ<sup>(2)</sup> is due to the induced defect structures and large χ<sup>(3)</sup> of the chalcogenide glasses.
© 2001 Optical Society of America
(160.2750) Materials : Glass and other amorphous materials
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
Jianrong Qiu, Jinahi Si, and K. Hirao, "Photoinduced stable second-harmonic generation in chalcogenide glasses," Opt. Lett. 26, 914-916 (2001)