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X-ray emission from laser-irradiated gold targets with surface modulation

Published online by Cambridge University Press:  18 January 2002

T. DESAI ,
H. DAIDO ,
M. SUZUKI ,
N. SAKAYA ,
A.R. GUERREIRO  and
K. MIMA
T. DESAI
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
H. DAIDO
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
M. SUZUKI
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
N. SAKAYA
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
A.R. GUERREIRO
Affiliation:
GoLP/Centro de Fisica de Plasmas, Instituto Superior Tecnico, 1049-001, Lisboa Codex, Portugal
K. MIMA
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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Abstract

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X-ray emission spectra in the 5–22 nm range were recorded from planar and structured (meshlike groove surface) gold targets at 45° and 90° to the laser axis. A laser beam of 10-ns duration with EL ≤ 700 mJ and 1.06-μm wavelength was used for the experiment. Experimental results indicate an enhanced X-ray yield from a structured target as compared to a planar target under identical experimental conditions. Increased X-ray emission is attributed to plasma confinement and the possibility of conversion of kinetic energy into localized thermal energy of the plasma. Results are analyzed explicitly on the incident laser energy.

Type
Research Article
Information
Laser and Particle Beams , Volume 19 , Issue 2 , April 2001 , pp. 241 - 247
Copyright
© 2001 Cambridge University Press