1.06μm连续激光对InSb、Si、Ge、Ni、Cu材料热损伤数值分析

摘要

According to the thermal damage problems of InSb,Si,Ge,Ni,Cu materials under 1.06μm continuous la-ser irradiation,the theoretical and numerical simulations have been researched. Considering the thermal physical parame-ters of the materials changing with temperature, a two-dimensional axial symmetry temperature model has been estab-lished to simulate the temperature rise and melt damage thresholds of 5 kinds of materials with COMSOL,the thermal damage effects between the different laser intensity distributions have been compared and analyzed. The researches show that the differences of the temperature rise and the damage thresholds between 5 kinds of materials under the same la-ser irradiation conditions are mainly due to the thermal parameters and the absorption coefficient between the different materials. Compared with the other 4 kinds of materials,InSb is easier to be melting damage and it's temperature rise is higher;under the same laser power, the temperature rise with uniform distribution is higher than which in Gaussian distribution;under the identical irradiation time, the melting damage threshold in Gaussian distribution is higher than which in uniform distribution;under the same laser power density,the melting damage is easier to obtained in uniform distribution than Gaussian distribution;the laser power density remains stable to reach the melting damage with the lon-ger time of laser irradiation for the two kinds of the laser intensity distributions.%针对波长1.06μm连续激光辐照InSb、Si、Ge、Ni、Cu材料的热损伤问题,开展了理论和数值模拟研究.考虑了材料的热物性参数随温度变化情况,建立了激光辐照下的二维轴对称温升模型;利用COMSOL软件分别模拟了5种材料的温升和熔融损伤阈值,比较分析了不同光强分布激光的热损伤效果.研究结果表明:相同辐照条件的激光引起5种材料的温升及损伤阈值差异,主要是由于不同材料的热物性参数和吸收系数的差异造成的,并且InSb材料相比另外4种材料的温升较高,较易发生熔融损伤;相同能量的激光辐照同一材料时,均匀分布激光引起的温升相比高斯分布的较高;相同的辐照时间,高斯分布激光的熔融损伤阈值高于均匀分布;相同的激光功率密度,均匀分布激光相比高斯分布激光最先到达熔融损伤;随着辐照时间的延长,两种光强分布激光达到熔融损伤的激光功率密度均趋于稳定.