Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-03T00:47:07.206Z Has data issue: false hasContentIssue false
  • English
  • Français

Plasma frequency and harmonic emission from fs-laser plasmas

Published online by Cambridge University Press:  01 October 1999

U. TEUBNER ,
P. GIBBON ,
D. ALTENBERND ,
D. OBERSCHMIDT ,
E. FÖRSTER ,
A. MYSYROWICZ ,
P. AUDEBERT ,
J.-P. GEINDRE  and
J.C. GAUTHIER
U. TEUBNER
Affiliation:
Abteilung Röntgenoptik, Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
P. GIBBON
Affiliation:
Abteilung Röntgenoptik, Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
D. ALTENBERND
Affiliation:
Abteilung Röntgenoptik, Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
D. OBERSCHMIDT
Affiliation:
Abteilung Röntgenoptik, Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
E. FÖRSTER
Affiliation:
Abteilung Röntgenoptik, Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
A. MYSYROWICZ
Affiliation:
Laboratoire d'Optique Appliquée—ENSTA, CNRS UMR7639, INSERM U451, Chemin de la Hunière, 91761 Palaiseau, France
P. AUDEBERT
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605 CNRS-Ecole Polytechnique-CEA-Université Paris VI, Ecole Polytechnique, 91128 Palaiseau, France
J.-P. GEINDRE
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605 CNRS-Ecole Polytechnique-CEA-Université Paris VI, Ecole Polytechnique, 91128 Palaiseau, France
J.C. GAUTHIER
Affiliation:
Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605 CNRS-Ecole Polytechnique-CEA-Université Paris VI, Ecole Polytechnique, 91128 Palaiseau, France
Get access Rights & Permissions [Opens in a new window]

Abstract

Electromagnetic emission at the plasma frequency ωp and its harmonics nωp has been studied. Although such emission is well known from very low density plasmas (electron density of the order of ne ≈ 108 cm−3) now, for the first time it has also been observed from a high density plasma (electron density of the order of ne ≈ 1023 cm−3) produced by a high-intensity femtosecond laser pulse. This radiation is strongly connected to jets of high energy electrons produced in such steep gradient plasmas by collective mechanisms, and probably to nonlinear Langmuir waves in the overdense plasma region. Theoretical investigations using particle-in-cell simulations have been made to pinpoint the physical origin and properties of the emission. Preliminary results show a very weak scaling of the ωp and 2ωp emission with intensity, which should provide clues for future theoretical analyses. Although not the main subject of the present work, also harmonics up to the 20th of the laser fundamental may have been observed close to the ωp and 2ωp line emission in the present experiment (PACS numbers: 52.40.Nk, 42.65.ky, 52.65.-y, 33.20.Ni, 52.25.Qt).

Type
Research Article
Information
Laser and Particle Beams , Volume 17 , Issue 4 , October 1999 , pp. 613 - 619
Copyright
1999 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)