Abstract
We report on broadband nonlinear optical (NLO) responses from a phase-change chalcogenide compound . Its glassy phase exhibits unusual second-harmonic generation (SHG) due to the preservation of local crystallographic order. The SHG efficiency of the glassy form can be boosted by more than 2 orders of magnitude by simple heat treatment. Strong SHG and third-harmonic generation from both glassy and crystalline compounds were characterized over a wide wavelength range of . Our results imply that can be utilized for various NLO applications in the mid-infrared spectrum.
© 2013 Optical Society of America
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