Mid-Infrared Single-Mode Ge-As-S Fiber for High Power Laser Delivery
Mid-Infrared Single-Mode Ge-As-S Fiber for High Power Laser Delivery
复制标题
用于高功率激光传输的中红外单模 Ge-As-S 光纤
DOI：
10.1109/jlt.2021.3130182
复制
发表时间：
2022-04
影响因子：
4.7
通讯作者：
Rongping Wang
中科院分区：
文献类型：
--
作者：
Xiaolin Liang;Minghui Zhong;Tiesong Xu;Jing Xiao;Kai Jiao;Xiange Wang;Yan Bin;Jia Liu;Xunsi Wang;Zheming Zhao;Shengchuang Bai;Sensen Li;Dayong Du;Yaojie He;Qiuhua Nie;Rongping Wang
传统的单模As-S光纤由于激光损伤阈值低，在高功率中红外激光传输中受到限制。首次采用一种新的挤压法制备了Ge-As-S玻璃基硫系单模光纤，并对光纤的传输性能和功率传输过程中的热损伤进行了详细的研究。该光纤在3.8-4.7 μm波长范围内可维持6.2W的激光功率，在大气环境下，功率密度为1.97 MW/cm ~ 2，纤维表面无明显损伤。这与典型的单模As-S光纤在4 μm以上波长处的功率传输小于1 W形成鲜明对比。通过对光纤表面温度的测量和对光纤内部温度分布的计算，研究了光纤热损伤的动力学，估计该光纤在3.8-4.7 μm波长范围内可传输10 W以上的激光功率。此外，通过比较传统As-S光纤和Ge-As-S光纤的自聚焦效应，发现Ge-As-S光纤的临界功率比As-S光纤的大，并且随着波长的增加，这种差异变得更大。
Traditional single-mode As-S fiber is limited in the transmission of high power mid-infrared laser by its low threshold of laser-induced damage. A single-mode chalcogenide (ChG) fiber based on Ge-As-S glasses has been prepared via a novel extrusion method for the first time, the transmission performance and thermal damage of the fiber during the power delivery have been studied in details. The fiber can sustain a laser power of 6.2 W at wavelength of 3.8–4.7 μm, i.e., power density of 1.97 MW/cm2 under atmosphere surrounding without any obvious damage on the fiber surfaces. This is in sharp contrast with the power transmission under 1 W at a wavelength longer than 4 μm for typical single-mode As-S fiber. By measuring the fiber surface temperature and estimating the temperature distribution in the fiber through calculations, the kinetics of fiber thermal damage has been investigated, and it is estimated that the fiber can transmit more than 10 W of laser power at wavelength of 3.8–4.7 μm. In addition, by comparing the self-focusing effect of traditional As-S fiber and Ge-As-S fiber, it is found that the critical power of Ge-As-S fiber is larger than that of As-S fiber, and the difference becomes even larger with increasing wavelength.