摘要
以热传导方程为基础,建立了纳秒脉冲激光烧蚀固体靶材料的一维模型。考虑等离子体对入射激光的屏蔽作用,计算了峰值为1012W/m2的纳秒激光对石墨靶烧蚀情况。计算表明,石墨靶内部的温度沿深度方向呈指数递减;靶材料表面温度随着激光强度的增加而增加,并在激光峰值时刻达到最大值。表面温度升高将加快石墨靶蒸发速率,进一步增加了等离子体对激光的屏蔽作用,最后可屏蔽激光能量占总入射激光能量的0.3,石墨靶烧蚀的最终深度约350 nm。
Based on the heat conduction equation,a one-dimension numerical model of pulse laser ablation solid target was constructed. This model considering the plasma shield effect was used to calculate the graphite ablation undergoing the incident laser in the form of Gaussian distribution with peak value 1012 W/m^2. The results indicate that the temperature of graphite declines by exponent with the depth increase,and the surface temperature will improve due to the laser irradiation increase. The max surface temperature 9 000 K is obtained at the peak laser irradiation. The higher surface temperature promotes the higher evaporation rate,which has the max value 26 m/s at20 ns. Meanwhile,it results in the ablation depth greatly,it is about 350 nm. Higher evaporation rate generates a large number of plasmas,which leads to the produced plasma absorb much laser energy,the ratio of the absorption energy to the incident laser energy is about 0. 3.
出处
《电器与能效管理技术》
2016年第21期5-9,38,共6页
Electrical & Energy Management Technology
基金
陕西省自然科学基础研究计划资助项目(2016JQ5001)
关键词
激光烧蚀
一维数值仿真
表面温度
等离子屏蔽
laser ablation
one-dimension numerical simulation
surface temperature
plasma shield
作者简介
董勤晓（1977-）,男,高级工程师,主要从事串联补偿装置关键设备、空气触发放电、一次设备及其智能化等研究.
杨泽峰（1989-）,男,博士研究生,研究方向为激光烧蚀等离子体、等离子体诊断等.
刘之方（1979-）,男,教授级高级工程师,主要从事串联补偿装置关键设备、空气触发放电、-次设备及其智能化等方面的研究.
