Laser-produced annular plasmas

被引：14

作者：

Veloso, F. ^{[1
]}

Chuaqui, H. ^{[1
]}

Aliaga-Rossel, R. ^{[1
]}

Favre, M. ^{[1
]}

Mitchell, I. H. ^{[1
]}

Wyndham, E. ^{[1
]}

机构：

[1] Pontificia Univ Catolica Chile, Dept Fis, Santiago 7820436, Chile

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2006年 / 77卷 / 06期

关键词：

D O I：

10.1063/1.2206773

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A new technique is presented for the formation of annular plasmas on a metal surface with a high-power laser using a combination of axicon and converging lenses. The annular plasma formed on a titanium target in a chamber of hydrogen gas was investigated using schlieren imaging and Mach Zehnder interferometry. Expansion of the plasma was shown to be anisotropic with velocities of similar to 10(3)-10(4) m/s. Electron densities of 10(18) cm(-3) were measured with radial profiles that confirm the presence of a hollow structure. The interferometric observations also show the presence of an inward shock wave traveling to the center of the annular plasma, which compresses the background neutrals, reaching a density around 18 times initial gas density, at 95 ns after the initial annular plasma is produced.

引用

页数：5

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