超相对论条件下固体靶对短激光脉冲的吸收

Absorption of short laser pulses on solid targets in the ultrarelativistic regime.

作者信息

Ping Y, Shepherd R, Lasinski B F, Tabak M, Chen H, Chung H K, Fournier K B, Hansen S B, Kemp A, Liedahl D A, Widmann K, Wilks S C, Rozmus W, Sherlock M

机构信息

Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

出版信息

Phys Rev Lett. 2008 Feb 29;100(8):085004. doi: 10.1103/PhysRevLett.100.085004. Epub 2008 Feb 28.

DOI:10.1103/PhysRevLett.100.085004

PMID:18352633

Abstract

We report the first direct measurements of total absorption of short laser pulses on solid targets in the ultrarelativistic regime. The data show an enhanced absorption at intensities above 10(20) W/cm(2), reaching 60% for near-normal incidence and 80%-90% for 45 degrees incidence. Two-dimensional particle-in-cell simulations demonstrate that such high absorption is consistent with both interaction with preplasma and hole boring by the intense laser pulse. A large redshift in the second harmonic indicates a surface recession velocity of 0.035c.

摘要

我们报告了在超相对论 regime 中对固体靶上短激光脉冲总吸收的首次直接测量。数据显示，在强度高于10(20)W/cm(2)时吸收增强，近垂直入射时达到60%，45度入射时达到80%-90%。二维粒子模拟表明，这种高吸收与与预等离子体的相互作用以及强激光脉冲的钻孔效应均相符。二次谐波中的大红移表明表面后退速度为0.035c。