Analytical formula for residual current density excited in the process of gas ionization by a few-cycle laser pulse in the low-intensity limit

23rd International Laser Physics Workshop

Silaev, A.A.^1 ; Vvedenskii, N.V.^1

Institute of Applied Physics, Russian Academy of Sciences, University of Nizhny Novgorod, Nizhny Novgorod

603950, Russia^1

关键词: Analytical formulas;    Analytical studies;    Closed-form analytical formulae;    Degree of ionization;    Few-cycle laser pulse;    Peak intensity;    Pulse parameter;    Residual current;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012016/pdf
DOI  :  10.1088/1742-6596/594/1/012016

来源: IOP

【 摘 要 】

This work is devoted to analytical study of excitation of the residual current density (RCD) in the process of gas ionization by a few-cycle laser pulse. The RCD remains in the laser-produced plasma after the passage of the laser pulse and is as an initial push leading to excitation of the plasma oscillations which can radiate terahertz waves. We derive simple closed-form analytical formula for RCD for relatively small peak intensity of few-cycle laser pulse, which corresponds to small final degree of ionization. The dependences of the RCD on laser pulse parameters are discussed.