Abstract
In this study, a series of Ge20Te x Se(80−x) (x = 0, 5, 10, 20, 30, 60, 70) chalcogenide glasses were prepared using conventional melt-quenching technique. Through absorption spectra analysis, the optical Tauc gaps were derived in detail along the increase in the Te content which can be supported by structural changing of glass network shown by Raman spectra. The third-order optical nonlinearity of the glasses at mid-infrared wavelength of 3.1 μm was investigated by traditional Z-scan method. The nonlinear refractive index of the glasses increased with the increase in the Te content, typically the measured nonlinear refractive index of Ge20Se50Te30 glass increased to 8.2 ± 1.2 × 10−18 m2/W. The relationship between the nonlinear refractive index and the optical band gap was analyzed.
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Acknowledgments
This work was financially supported by the Natural Science Foundation of China (Grant Nos. 61435009, 61177087, and 61377099), Scientific Research Fund of Zhejiang Provincial Education Department (R1101263), Teaching and Research Award Program for Outstanding Young Teachers in Higher Education, Institutions of MOE, P.R.C. Ningbo Optoelectronic Materials and Devices Creative Team (2009B21007), and Scientific Research Foundation of Graduate School of Ningbo University. This work was also sponsored by K.C. Wong Magna Fund of Ningbo University and the Outstanding (Postgraduate) Dissertation Growth Foundation of Ningbo University (Grant No. PY2014014).
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Sun, L., Chen, F., Xu, Y. et al. Investigation of the third-order nonlinear property of Ge–Se–Te glasses at mid-infrared. Appl. Phys. A 122, 816 (2016). https://doi.org/10.1007/s00339-016-0351-x
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DOI: https://doi.org/10.1007/s00339-016-0351-x