Second harmonic generation of high power Cosh-Gaussian beam in cold collisionless plasma  

作　　者：Keshav Walia Kulkaran Singh Deepak Tripathi 

机构地区：[1]Department of Physics,DAV University,Jalandhar,India [2]Department of Physics,AIAS,Amity University,Noida,India

出　　处：《Communications in Theoretical Physics》2022年第10期127-135,共9页理论物理通讯（英文版）

摘　　要：The purpose of this study is to explore the second harmonic generation(SHG)of a high power Cosh-Gaussian beam in cold collisionless plasma.The ponderomotive force causes carrier redistribution from high field to low field region in presence of a Cosh-Gaussian beam thereby producing density gradients in the transverse direction.The density gradients so produced the results in electron plasma wave(EPW)generation at the frequency of the input beam.The EPW interacts with the input beam resulting in the production of 2nd harmonics.WKB and paraxial approximations are employed for obtaining the 2nd order differential equation describing the behavior of the beam’s spot size against normalized distance.The impact of well-established laser-plasma parameters on the behavior of the beam’s spot size and SHG yield are also analyzed.The focusing behavior of the beam and SHG yield is enhanced with an increase in the density of plasma,the radius of the beam and the decentred parameter,and with a decrease in the intensity of the beam.The results of the current problem are really helpful for complete information of laser-plasma interaction physics.

关 键 词：second harmonic generation cold collisionless plasma ponderomotive force electron plasma wave Cosh-Gaussian beam 

分 类 号：O43[机械工程—光学工程]