Present work focuses on Hermite-cosh-Gaussian (HchG) laser-induced third harmonic generation (THG) in plasma on account of self-focusing. HchG laser beam gets self-focused due to ponderomotive force while propagating in plasma. Interaction of intense laser pulse results ponderomotive force on electrons and induce density perturbation that produces density oscillations at second harmonic frequency. Induced density perturbation beats with quiver velocity of electrons at laser frequency to produce a third harmonic nonlinear current. Application of wiggler magnetic field satisfies the phase matching condition which results resonant THG. Significant enhancement in the efficiency of THG is observed by using HchG laser profile for mode index m = 2. Small variation in decentered parameter also affects the THG efficiency which shows the sensitivity of decentered parameter.

由于自聚焦，目前的工作集中于等离子体中的Hermite-cosh-Gaussian（HchG）激光诱导的三次谐波产生（THG）。HchG激光束由于在等离子体中传播时的动能而自动聚焦。强激光脉冲的相互作用会在电子上产生静动力，并引起密度扰动，从而在二次谐波频率下产生密度振荡。在激光频率下，感应的密度扰动以电子的颤动速度跳动，以产生三次谐波非线性电流。摆动磁场的施加满足相位匹配条件，从而导致谐振THG。对于模式指数m = 2，使用HchG激光轮廓可以观察到THG效率的显着提高。