摘要
基于组合激光的新概念,对重频激光与连续激光组合辐照下钢靶的温升进行了数值计算。根据实验测得的钢靶对1.06μm连续激光的反射率随温度的变化曲线,通过求解二维轴对称热传导方程,比较了不同组合参数下钢靶的温升以及能量利用率,分析了组合激光的优势所在。计算结果表明:平均功率密度相同时,组合激光要比连续激光的加热效率高,加热效率还与组合激光中重频激光的各种参数相关,重频激光占空比为1%且峰值功率密度保持不变时,加热效率随着重频率的减小而增高。
Based on the new concept of the combined laser,the temperature rise of the steel target irradiated by the combined laser was calculated.Utilizing the temperature dependence of the reflectivity of 45# steel target irradiated by 1.06 μm CW laser,and solving the two-dimensional axisymmetric equation of the heat conduction,the temperature rise and the energy utility ratio were compared among various combined parameters,and the advantage of the combined laser was analyzed.It reveals that the heating efficiency of the combined laser is higher than that of a CW laser under the same average power density.This efficiency is also dependent on the parameters of the repetitive frequency laser.The temperature of the steel target rises and the energy utility rate increases as the frequency of the pulse laser decreases,when the duty-cycle is 1% and the peak power density is kept constant.
出处
《红外与激光工程》
EI
CSCD
北大核心
2010年第1期42-46,共5页
Infrared and Laser Engineering
基金
国家自然科学基金资助项目(60908027)
关键词
激光与物质相互作用
组合激光
重频激光
温度场
Laser-matter interaction
Combined laser
Repetitive frequency laser
Temperature field
