Broadband studies of the strong mid-infrared nonlinear optical responses of KPSe6

초록

One-dimensional noncentrosymmetric KPSe6 is an excellent mid-infrared (mid-IR) nonlinear optical (NLO) material possessing reversible phase-change behavior. In this special issue we present a broadband NLO study on its crystalline and glassy phases as well as fundamental material characterizations. The compound has a bandgap of similar to 2.1 eV and exhibits intrinsic second harmonic generation even in the glassy phase. The crystalline compound is type-I phase-matchable and shows strong second- and third-order NLO responses over a broad wavelength range (1.0 - 3.0 mu m) with excellent optical transparency. Based on the measured NLO coefficients chi((2)) similar or equal to 142.8 pm/V and chi((3)) similar or equal to 4.7 x 10(5) pm(2)/V-2, we propose that KPSe6 can be utilized for numerous mid-IR NLO applications. (c) 2013 Optical Society of America

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