光学学报, 2019, 39 (10): 1016001, 网络出版: 2019-10-09
Ge-Sb-S硫系玻璃的飞秒激光诱导损伤研究 下载: 950次
Femtosecond Laser-Induced Damage on Ge-Sb-S Chalcogenide Glass
摘要
用超短脉冲抽运高非线性硫系玻璃光波导是产生宽带中红外超连续谱的重要途径,超连续谱的输出平均功率主要受材料激光损伤阈值(LDT)的限制。为了阐明硫系玻璃的LDT与玻璃化学组成的关系,以及不同重复频率超短脉冲辐照下对应的损伤机理,以脉冲宽度为216 fs、中心波长为1030 nm、重复频率为1~1000 kHz的激光为辐照源,对Ge-Sb-S硫系玻璃进行激光辐照,研究了玻璃的激光损伤特性。结果表明:玻璃的LDT随辐照源重复频率的增大而减小;具有较高平均键能的玻璃表现出了较高的LDT,化学计量配比的玻璃具有最优的抗激光损伤性能;当辐照脉冲的重复频率在10 kHz以下时,损伤主要由雪崩电离引起;相比之下,当辐照脉冲的重复频率超过10 kHz时,热积累变得显著,会促进玻璃的损伤。
Abstract
The exposure of high-nonlinearity chalcogenide glass fibers to ultrashort pulses is an important approach for achieving broadband mid-infrared supercontinuum (SC). The average output power of a generated SC is mainly limited by the laser damage threshold (LDT) of the material. In this work, the laser damage characteristics of the germanium-antimony-sulfur (Ge-Sb-S) chalcogenide glass are studied using a laser with a pulse width of 216 fs, a central wavelength of 1030 nm, and a repetition rate of 1-1000 kHz to elucidate the composition dependence of the LDT of the chalcogenide glass as well as the mechanisms of damage to the material exposed to irradiation pulses with different repetition rates. Results show that the LDT of the Ge-Sb-S glass decreases with increasing repetition rate of the irradiation pulse. The glass with high average bond energy is found to have a high LDT, and its stoichiometric composition exhibits optimal resistance to optical damage. When the repetition rate of laser irradiation pulse is less than 10 kHz, the glass is observed to be mainly damaged by avalanche ionization. In contrast, thermal accumulation is the dominant factor promoting damage when the repetition rate of the irradiation pulse exceeds 10 kHz.
李铜铜, 张鸣杰, 田康振, 张翔, 袁孝, 杨安平, 杨志勇. Ge-Sb-S硫系玻璃的飞秒激光诱导损伤研究[J]. 光学学报, 2019, 39(10): 1016001. Tongtong Li, Mingjie Zhang, Kangzhen Tian, Xiang Zhang, Xiao Yuan, Anping Yang, Zhiyong Yang. Femtosecond Laser-Induced Damage on Ge-Sb-S Chalcogenide Glass[J]. Acta Optica Sinica, 2019, 39(10): 1016001.