Simultaneous measurements of hard X rays and second-harmonic emission in fs laser-target interactions

Year: 1996

Authors: Gizzi LA., Giulietti D., Giulietti A., Audebert P., Bastiani S., Geindre JP., Mysyrowicz A.

Autors Affiliation: Ecole polytech ENSTA, Lab Opt Appl, F-91120 Palaiseau, France;
CNR Ist TESRE, I-40129 Bologna, Italy;
Univ Pisa, Dip Fisica, I-56100 Pisa Italy;
Ecole polytech, Lab utilisat laser instense, Fì91128 Palaiseau, France

Abstract: The interaction of 150 fs laser pulses with very thin plastic targets at an intensity of 5 X 10(17) W/cm(2) was investigated experimentally. Second-harmonic (SH) radiation was found to be emitted only in the specular direction. Both SH intensity and hard x-ray yield were found to be strongly dependent upon the laser polarization. The main features of SH emission are in agreement with a theoretical model which assumes resonance absorption as the source mechanism of electron plasma waves. Measurements suggest that, in conditions of maximum energy absorption, wave breaking of resonantly excited electron plasma waves takes place.


Volume: 76 (13)      Pages from: 2278  to: 2281

KeyWords: femtosecond laser; generation; absorption; plasmas; pulses
DOI: 10.1103/PhysRevLett.76.2278

Citations: 79
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