Self-Focusing/Defocusing of Chirped Gaussian Laser Beam in Collisional Plasma with Linear Absorption  

作　　者：Manzoor Ahmad Wani Niti Kant 

机构地区：[1]Department of Physics, Lovely Professional University

出　　处：《Communications in Theoretical Physics》2016年第9期349-354,共6页理论物理通讯（英文版）

基　　金：Supported by a financial grant from CSIR,New Delhi,India,under Project No.03(1277)/13/EMR-Ⅱ

摘　　要：This paper presents an investigation on the self-focusing/defocusing of chirped Gaussian laser beam in collisional plasma with linear absorption. We have derived the differential equation for the beam width parameter by using WKB and paraxial approximations and solved it numerically. The effect of chirp and other laser plasma parameters is seen on the behavior of beam width parameter with dimensionless distance of propagation. The results are discussed and presented graphically. Our simulation results show that the amplitude of oscillations decreases with the distance of propagation. Due to collisional frequency, the laser beam shows fast divergence which can be minimized by the introduction of chirp parameter. The chirp decreases the effect of defocusing and increases the ability of self-focusing of laser beam in collisional plasma.

关 键 词：self-focusing/defocusing chirped Gaussian laser beam collisional plasma linear absorption 

分 类 号：O435[机械工程—光学工程]