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Second harmonic emission from laser-preformed plasmas as a diagnostic for filamentation in various interaction conditions

Published online by Cambridge University Press:  09 March 2009

E. Schifano ,
S.D. Baton ,
C. Labaune ,
N. Renard ,
V. Biancalana ,
A. Giulietti  and
D. Giulietti
E. Schifano
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, 91128 Palaiseau Cedex, France
S.D. Baton
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, 91128 Palaiseau Cedex, France
C. Labaune
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, 91128 Palaiseau Cedex, France
N. Renard
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, 91128 Palaiseau Cedex, France
V. Biancalana
Affiliation:
Istituto di Fisica Atomica e Molecolare, Pisa, Italy
A. Giulietti
Affiliation:
Istituto di Fisica Atomica e Molecolare, Pisa, Italy
D. Giulietti
Affiliation:
Dipartimento di Fisica, Università di Pisa, Italy
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Abstract

Second harmonic emission from underdense laser-preformed plasmas has been investigated in forward direction with respect to the interaction beam axis. Two series of measurements have been performed using two focusing conditions and changing the intensity of the interaction beam. Effects of beam smoothing by random phase plates on second harmonic emission were also tested. Novel information on density and intensity gradients driven by filamentation instability was obtained.

Type
Research Article
Information
Laser and Particle Beams , Volume 12 , Issue 3 , September 1994 , pp. 435 - 444
Copyright
Copyright © Cambridge University Press 1994

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