The direct measurement of ablation pressure driven by 351-nm laser radiation
The direct measurement of ablation pressure driven by 351-nm laser radiation
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DOI：
10.1063/1.3646554
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发表时间：
2011-10-01
影响因子：
3.2
通讯作者：
Meyerhofer, D. D.
中科院分区：
文献类型：
--
作者：
Fratanduono, D. E.;Boehly, T. R.;Meyerhofer, D. D.
对于351 nm激光照射下的金刚石靶，直接推导出了烧蚀压力与激光强度的瞬时比例关系。用7×10(13)W/cm(2)的直驱激光烧蚀产生了从100 Gpa到970 Gpa的持续增加的压力分布。利用靶体后部的自由面速度直接推断靶体前部的瞬时烧蚀压力分布。靶上的激光强度由激光功率测量和充分表征的激光光斑决定。消融压力与激光强度的关系为P(Gpa)=42(+/-3)[I(TW/cm(2))](0.71(+/-0.01))。(C)2011年美国物理研究所。[DOI：10.1063/1.3646554]
The instantaneous scaling of ablation pressure to laser intensity is directly inferred for ramp compression of diamond targets irradiated by 351-nm light. Continuously increasing pressure profiles from 100 to 970 GPa are produced by direct-drive laser ablation at intensities up to 7 x 10(13) W/cm(2). The free-surface velocity on the rear of the target is used to directly infer the instantaneous ablation-pressure profile at the front of the target. The laser intensity on target is determined by laser power measurements and fully characterized laser spots. The ablation pressure is found to depend on the laser intensity as P(GPa) = 42(+/- 3)[I(TW/cm(2))](0.71(+/- 0.01)). (C) 2011 American Institute of Physics. [doi:10.1063/1.3646554]