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Propagation of Intense Laser Light in Ionizing-gases and Plasmas

Author: LiuMingWei
Tutor: GuoHong
School: South China Normal University
Course: Optics
Keywords: Intense laser transmission Ionized gas Plasma Relativistic Nonlinear Ponderomotive force Wakefield
CLC: O437
Type: Master's thesis
Year: 2004
Downloads: 259
Quote: 1
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Abstract


In this thesis, the theory of the strong laser transmission behavior of ionized gas and plasma medium. Intense laser ionized gas transmission ionization instability, the vector the nonparaxial transmission and energy loss mechanisms, as well as intense laser in a weakly relativistic plasma transfer non-linear effects, the role of the ponderomotive force and wakefield effect and so made a basic analysis. Paper content and the result is divided into four chapters: The first chapter is the preamble of the subsequent chapters is the introduction of the work done during graduate. The first chapter, the first \Chapter II, is to study the transfer of the strong laser in the ionized gas. Paraxial transfer equation derived strong laser ionized gas transmission, first starting from the Maxwell equations paraxial transfer equation expansion method to analyze the use of source, the beam radius evolution equation, to discuss ionizing modulation instability in the transmission process ; re-establishment of the vectorial nonparaxial model, and discuss the gas ionization laser plasma energy loss mechanism. Chapter to study the transmission of intense laser plasma weak relativistic nonlinear effects. First, starting from the Maxwell equations to derive the transfer equation and laser wakefield equation. Analysis of relativistic self-focusing effect and pre-plasma channel guide. Paraxial case laser relativistic self-focusing of the transfer equation will result in focusing the beam to zero light intensity infinite singularity appears. Therefore, the study of the impact of the higher order relativistic nonlinear effects of laser transmission, and found that the higher order relativistic nonlinear effects can inhibit the emergence of such a singularity;, and higher order relativistic nonlinear effects nonparaxial The effects were compared, found that higher order nonlinear relativistic effect plays a major role. Ultrashort pulse transmission analysis of finite pulse width effect of the amendments to the paraxial equation, when only consider relativistic nonlinear effects will cause the forefront of laser pulse self-steepening. Chapter IV, the ponderomotive force effect of the laser field and the electron plasma wave (wakefield) laser transmission. First, the use of the the Lorentz equation derived ponderomotive force expression described by relativistic factor. Analysis of the ponderomotive force self-channel effects, the results show that the ponderomotive force self-channel effects can enhance the self-focusing laser contains the ponderomotive force since the channel effects of non-paraxial transfer equation is established on the basis of laser transfer process. Coda field effect on the transmission of laser found longitudinal coda field effect will cause the laser pulse asymmetric self-phase modulation.

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