用软X射线激光探测法测量在过密等离子体中进行的激光打孔。

Laser-hole boring into overdense plasmas measured with soft X-Ray laser probing.

作者信息

Takahashi K, Kodama R, Tanaka KA, Hashimoto H, Kato Y, Mima K, Weber FA, Barbee TW

机构信息

Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, Japan.

出版信息

Phys Rev Lett. 2000 Mar 13;84(11):2405-8. doi: 10.1103/PhysRevLett.84.2405.

DOI:10.1103/PhysRevLett.84.2405

PMID:11018896

Abstract

A laser self-focused channel formation into overdense plasmas was observed using a soft x-ray laser probe system with a grid image refractometry (GIR) technique. 1.053 &mgr;m laser light with a 100 ps pulse duration was focused onto a preformed plasma at an intensity of 2x10(17) W/cm (2). Cross sections of the channel were obtained which show a 30 &mgr;m diameter in overdense plasmas. The channel width in the overdense region was kept narrow as a result of self-focusing. Conically diverging density ridges were also observed along the channel, indicating a Mach cone created by a shock wave due to the supersonic propagation of the channel front.

摘要

使用带有网格图像折射测量（GIR）技术的软X射线激光探测系统，观测到了激光在过密等离子体中形成自聚焦通道的现象。脉宽为100 ps的1.053μm激光以2×10¹⁷ W/cm²的强度聚焦到预先形成的等离子体上。获得了通道的横截面，其显示在过密等离子体中的直径为30μm。由于自聚焦，过密区域的通道宽度保持狭窄。沿着通道还观测到了呈锥形发散的密度脊，这表明由于通道前沿的超音速传播产生了冲击波，从而形成了马赫锥。