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Author Singh, Prashant Kumar ♦ Adak, Amitava ♦ Lad, Amit D. ♦ Chatterjee, Gourab ♦ Ravindra Kumar, G. ♦ Brijesh, P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ CONTROL ♦ DECAY INSTABILITY ♦ ELECTRON DENSITY ♦ ELECTRON TEMPERATURE ♦ EMISSION ♦ INHOMOGENEOUS PLASMA ♦ INTERACTIONS ♦ LASER-PRODUCED PLASMA ♦ PLASMONS ♦ PULSES ♦ SOLIDS
Abstract We investigate the onset of the two-plasmon-decay (TPD) instability in intense femtosecond laser-solid interaction. In particular, this instability, originating at the quarter critical electron density surface in the inhomogeneous plasma, is explored for a wide range of laser parameters-energy, pulse duration, and intensity contrast. By varying these laser parameters, we demonstrate ways to excite and control the growth of the TPD process. The pulse duration scan carried out under a constant laser fluence reveals the pulse width dependent nature of TPD growth. The spectral splitting of the TPD induced three-halves harmonic emission is used to infer the electron temperature near the quarter critical density surface. Moreover, by varying the laser contrast over four orders of magnitude, we find that the intensity threshold of three-halves harmonic emission increases by nearly two orders of magnitude. This contrast dependent intensity threshold for the emission of three-halves harmonic can be a useful diagnostic of the laser contrast.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 11


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