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基于热传导理论和实验相结合研究了连续CO2激光辐照Ge20Sb15Se65硫系玻璃作用下的损伤特性和机理。研究表明:Ge20Sb15Se65玻璃在高功率密度的CO2激光作用下,会出现陨石凹坑、微裂纹和空洞等损伤特征,其原因在于杂质吸收和多声子过程引起的热积累作用导致样品表面温度急剧升高,使得玻璃中熔点较低的Se元素组分气化蒸发,导致玻璃材料分解。当样品的光吸收系数为0.013 cm-1,厚度为3 mm时,玻璃损伤阈值为74.3 k W/cm2,实验结果与数值分析基本相符。
The damage characteristics and mechanism of Ge20Sb15Se65 chalcogenide glass irradiated by continuous CO2 laser were studied based on heat conduction theory and experiment. The results show that the Ge20Sb15Se65 glass has the characteristics of dimples, microcracks and voids under the effect of CO2 laser with high power density. The reason is that the heat accumulation caused by the impurity absorption and the multi-phonon process leads to the sharp increase of the sample surface temperature High, making the melting point of the glass elements in the Se vapor evaporation, resulting in the decomposition of glass materials. When the optical absorption coefficient of the sample is 0.013 cm-1 and the thickness is 3 mm, the damage threshold of glass is 74.3 k W / cm2. The experimental results are in good agreement with the numerical analysis.