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Study of second harmonic emissions for characterization of laser–plasma X-ray sources

Published online by Cambridge University Press:  15 October 2009

A. Giulietti ,
C. Beneduce ,
T. Ceccotti ,
D. Giulietti ,
L.A. Gizzi  and
R. Mildren
A. Giulietti
Affiliation:
Istituto di Fisica Atomica e Molecolare, Via del Giardino, 7, Pisa, 56127, Italy
C. Beneduce
Affiliation:
Istituto di Fisica Atomica e Molecolare, Via del Giardino, 7, Pisa, 56127, Italy
T. Ceccotti
Affiliation:
Istituto di Fisica Atomica e Molecolare, Via del Giardino, 7, Pisa, 56127, Italy
L.A. Gizzi
Affiliation:
Istituto di Fisica Atomica e Molecolare, Via del Giardino, 7, Pisa, 56127, Italy
R. Mildren
Affiliation:
Istituto di Fisica Atomica e Molecolare, Via del Giardino, 7, Pisa, 56127, Italy
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Abstract

An investigation of second harmonic (SH) and X-ray emissions from Al plasmas produced by 3-ns, 1.064-μm laser pulses at 1014 W/cm2 is reported. The SH and X-ray yields are strongly correlated as a function of the target position with respect to the laser beam focus. The SH originates from the underdense coronal plasma and has a filamentary source, while the X-ray source is uniform. The results suggest that, although the X-ray emission is significantly enhanced by the filamentation of the laser light in the corona, there is a smoothing effect in the energy transport process toward the overdense region.

Type
Research Article
Information
Laser and Particle Beams , Volume 16 , Issue 2 , June 1998 , pp. 397 - 404
Copyright
Copyright © Cambridge University Press 1998

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