Terahertz field excitation by a higher-order Gaussian laser pulse propagating in a magnetized plasma

We develop an analytical model for the generation of terahertz (THz) fields by the propagation of a higher-order Gaussian laser pulse in a magnetized plasma. A higher-mode Gaussian pulse is utilized for this purpose. The plasma nonlinearity is enhanced due to the modified gradient of the Gaussian spatial intensity profile. THz field generated by the transverse wakefields is significantly larger for this kind of laser pulses. The amplitude of THz fields can be enhanced by the flatness parameter of the higher-order Gaussian laser pulse. The fivefold enhancement of the THz field is reported in this study. Furthermore, the applied axial magnetic field also contributes to enhancing the THz field. For higher-order Gaussian laser pulse, the power conversion efficiency of THz field generation in the presence of a magnetized is four times higher than the ordinary Gaussian pulse case. The production of intense THz field with amplitudes belonging to the GV/m range is helpful in various applications such as THz extreme nonlinear optics and probing remote materials efficiently.