碳氢靶强激光烧蚀特性

ABLATION BEHAVIOR OF CH TARGETS BY HIGH POWER LASER

给出了准稳态情况下强激光烧蚀碳氢靶的实验结果，并与理论定标关系进行对比。实验中采用晶体谱仪时间积分和Ｘ射线条纹相机同时获取碳氢平面靶强激光烧穿厚度和烧穿时间。采用基频光大能量注入，大焦斑（４００μｍ），光束经列阵透镜均匀化后，烧蚀碳氢平面靶，Ｉａ≈０．５５×１０１４Ｗ／ｃｍ２，晶体谱仪获得的结果是ｍ＝２×１０５ｇ／ｃｍ２ｓ，Ｘ射线条纹相机获得的结果是ｍ＝１．３５×１０５ｇ／ｃｍ２ｓ，ｐ＝１．６×１０１２Ｐａ。并与收集到的国外数据进行了比较，在误差范围一致。

The experimental results of ablation of CH targets by high power laser and the comparison with the theory have been given. The ablation thickness and time were synchronously measured with time integrated X ray crystal spectrometers and a X ray streak camera.Using a lens array to make the laser energy distribution uniform,the diameter of focus spot φ 400mm, I a ≈0.55×10 14 W/cm 2,CH plane targets, m· =2×10 5g/cm 2·s from the crystal specrometers, m· =1.35×10 5g/cm 2·s from X ray streak camera, p =1.6×10 12 Pa.The comparison between our data and others shows correspondence between them within experimental error.