Research progress of third-order optical nonlinearity of chalcogenide glasses<xref rid="cpb_27_8_084208_fn1" ref-type="fn">*</xref><fn id="cpb_27_8_084208_fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant No. 61675106), the National Key Research and Development Program of China (Grant No. 2016YFB0303803), and the K C Wong Magna Fund in Ningbo University.</p></fn>

Research progress of third-order optical nonlinearity of chalcogenide glasses**

Project supported by the National Natural Science Foundation of China (Grant No. 61675106), the National Key Research and Development Program of China (Grant No. 2016YFB0303803), and the K C Wong Magna Fund in Ningbo University.

Zhang Xiao-Yu^{1, 2, 3}, Chen Fei-Fei^{1, 2, †}, Zhang Xiang-Hua⁴, Ji Wei⁵

(color online) Evolution of the measured effective nonlinear index coefficient as a function of laser intensity in As₂S₃ and As₂Se₃. The points represent the experimental data, and the solid lines refer to the linear regression fits using Eq. (9). Note the negative slopes for both materials (Boudebs G et al. 2003).^[54]