Terahertz radiation generation driven by the frequency chirped laser pulse in magneto-active plasma

This mathematical model deals with the nonlinear response of a magneto-active plasma to the interaction of frequency chirped laser pulses. The beating lasers produce a nonlinear ponderomotive force due to their oscillatory motion. This force drives a nonlinear current, which is responsible for the THz-wave generation at beat frequency. The influence of the external magnetic field on the optimization process of THz field amplitude is investigated numerically. A linear frequency chirp increases the duration of nonlinear interaction of laser pulse with plasma electrons and hence, enforces the resonance for longer duration. The presence of magnetic field further improves the resonance condition. Our numerical simulations reveal that there is a significant enhancement in the THz field strength for optimized value of chirp parameter and magnetic field.