Experimental study on the propagation of high intense laser pulse in an underdense plasma with pulse length comparable with the background plasma wavelength

Citation
Y. Tang et al., Experimental study on the propagation of high intense laser pulse in an underdense plasma with pulse length comparable with the background plasma wavelength, J PHYS IV, 11(PR2), 2001, pp. 543-546
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL DE PHYSIQUE IV
ISSN journal
1155-4339 → ACNP
Volume
11
Issue
PR2
Year of publication
2001
Pages
543 - 546
Database
ISI
SICI code
1155-4339(200107)11:PR2<543:ESOTPO>2.0.ZU;2-P
Abstract
Optical investigation are reported of 2TW, 45fs Ti:sapphire laser pulses in an optically ionized helium gas. The stimulated Raman backscattering (BSRS ) spectrum, together with ion energy spectrum, are measured as a function o f the electron density from 4.8x10(18)/cm(3) to 1.4x10(19)/cm(3). The SRS r eflectivity and the phenomena of transition from strongly coupled BSRS to w eakly coupled BSRS were studied and compared with theory. Second harmonic e mission in forward direction was also observed, and its origin is due to th e radial electron density gradient caused by the ionization process. A good agreement is obtained between theory and experimental results.