|Author||Singh, Mamta ♦ Gupta, D. N.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ COLLISIONAL PLASMA ♦ COLLISIONS ♦ COMPRESSION ♦ ELECTRONS ♦ FOCUSING ♦ ION TEMPERATURE ♦ LASERS ♦ NONLINEAR PROBLEMS ♦ NUMERICAL ANALYSIS ♦ ONE-DIMENSIONAL CALCULATIONS ♦ OPTIMIZATION ♦ PLASMA DENSITY ♦ PONDEROMOTIVE FORCE ♦ PULSES ♦ RELATIVISTIC RANGE ♦ THREE-DIMENSIONAL CALCULATIONS ♦ THREE-DIMENSIONAL LATTICES|
|Abstract||We present theory and numerical analysis which demonstrate laser-pulse compression in a collisional plasma under the weak-relativistic ponderomotive nonlinearity. Plasma equilibrium density is modified due to the ohmic heating of electrons, the collisions, and the weak relativistic-ponderomotive force during the interaction of a laser pulse with plasmas. First, within one-dimensional analysis, the longitudinal self-compression mechanism is discussed. Three-dimensional analysis (spatiotemporal) of laser pulse propagation is also investigated by coupling the self-compression with the self-focusing. In the regime in which the laser becomes self-focused due to the weak relativistic-ponderomotive nonlinearity, we provide results for enhanced pulse compression. The results show that the matched interplay between self-focusing and self-compression can improve significantly the temporal profile of the compressed pulse. Enhanced pulse compression can be achieved by optimizing and selecting the parameters such as collision frequency, ion-temperature, and laser intensity.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Physics of Plasmas|
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