Laser guiding through an axially non-uniform collisional plasma channel

4th International Workshop & Summer School on Plasma Physics 2010

Singh, Arvinder^1 ; Singh, Navpreet^1

Department of Physics, Dr. B.R.Ambedkar National Institute of Technology, Jalandhar, India^1

关键词: Laser prepulses;    Nonuniform heating;    Periodic beams;    Plasma channel;    Preformed plasma;    Rayleigh lengths;    Second-order ordinary differential equations;    Self-defocusing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/516/1/012027/pdf
DOI  :  10.1088/1742-6596/516/1/012027

来源: IOP

【 摘 要 】

This paper presents an investigation of laser guiding through an axially non-uniform collisional plasma channel formed by ionizing laser prepulse. Due to self-defocusing of the ionizing prepulse, an axial non-uniform plasma channel is formed. When delayed second laser beam propagates through such preformed plasma channel, on account of non-uniform intensity distribution of laser beam, non-uniform heating of electrons takes place. Non-uniform heating diffuses the electrons away from the axis which further enhances the plasma channel. Unbalanced diffraction and refraction phenomenon through such an axial non-uniform collisional plasma channel results into periodic beam width variation with the distance of propagation. Second order ordinary differential equations for the beam width parameter of prepulse and the guided beam have been set up by using the moment theory approach. Laser guiding upto several Rayleigh lengths has been observed.