We report a systematical investigation on the mid-infrared nonlinear performances of Ge-Sb-S glasses. Laser damage threshold (I_th) of Ge-Sb-S glasses was measured under femtosecond pulsed laser incidence ranging between 1.55-3.6 μm. It is found that the I_th has the maximum value at stoichiometric composition. Moreover, the relationship between the refractive index refractive (n₀) and nonlinear refractive indices (n₂) was obtained, following the semi-empirical Miller’s rule. The n₂ shows a nonlinear decay with the increase of wavelength. The multi-photon (up to 7-photon) absorption coefficients of Ge-Sb-S glasses were characterized. The composition Ge₂₅Sb₁₀S₆₅ with high I_th was selected as the core of the designed fiber. A compatible composition Ge₂₅Sb₈S₆₇ was chosen as the cladding glass. A 10 μm-diameter-core fiber was made via rod-in-tube method. By pumping a 10-cm-long fiber at 4.8 μm with 170 fs (100 kHz) pulses, we achieved a supercontinuum covering the 3–8 μm spectral range. It indicates that Ge-Sb-S glass family is a type of environment-friendly host materials for mid-infrared nonlinear applications.

中文翻译：

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Ge-Sb-S硫族化物玻璃的中红外非线性光学性能

我们报告了Ge-Sb-S眼镜的中红外非线性性能的系统研究。在1.55-3.6μm的飞秒脉冲激光入射下，测量了Ge-Sb-S玻璃的激光损伤阈值（I _th）。据发现，我_个具有化学计量组成的最大值。此外，遵循半经验米勒法则，获得了折射率折射率（n ₀）和非线性折射率（n ₂）之间的关系。该ñ ₂随波长增加显示非线性衰减。表征了Ge-Sb-S玻璃的多光子（至多7个光子）吸收系数。该组合物的Ge ₂₅ Sb的₁₀ š ₆₅具有高我_个被选作设计的光纤的核心。选择相容的成分Ge ₂₅ Sb ₈ S ₆₇作为包层玻璃。通过管中棒法制得直径为10μm的芯纤维。通过以170 fs（100 kHz）的脉冲泵浦4.8μm的10 cm长的光纤，我们获得了覆盖3–8μm光谱范围的超连续谱。这表明Ge-Sb-S玻璃家族是一种用于中红外非线性应用的环保基质材料。