物理
近轴近似
相对论等离子体
赫米特多项式
等离子体
自聚焦
高斯分布
WKB近似
梁(结构)
指数函数
激光器
脉搏(音乐)
量子电动力学
原子物理学
计算物理学
光学
量子力学
激光束
数学分析
探测器
数学
作者
Niti Kant,Shivani Vij,Sudarshan Kumar Chakravarti,Juleshwar Prasad Kushwaha,Vishal Thakur
出处
期刊:Communications in Theoretical Physics
[IOP Publishing]
日期:2019-12-01
卷期号:71 (12): 1469-1469
被引量:10
标识
DOI:10.1088/0253-6102/71/12/1469
摘要
Abstract In the present manuscript, we analyse the effect of exponential plasma density ramp for relativistic self-focusing of Hermite-cosh-Gaussian laser pulse in magnetoplasma. The exponential plasma density ramp is found to be more prominent in achieving the stronger self-focusing of Hermite-cosh-Gaussian laser beam in comparison to the tangential plasma density ramp. We propose a theoretical model for propagation of Hermite-cosh-Gaussian laser pulse in magnetoplasma with exponential density ramp. The nonlinearity in the medium arises because of the relativistic motion of electrons, being responsible for relativistic self-focusing. Equation of the beam width parameter is set up by taking the expression for the dielectric function and following Wentzel-Kramers-Brillouin (WKB) with paraxial ray approximations for mode indices m = 0, 1 and 2. Effect of decentered parameter is also analysed, which results in stronger self-focusing of the Hermite-cosh-Gaussian laser beam. Stronger self-focusing of laser beam is more pronounced in high density plasma with higher magnetic field.
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