THz radiation generation in axially magnetized collisional pair plasma

Highlights: • Electron-positron plasma is shown to produce efficient THz radiation even in the presence of collisions. • Axial magnetic field does not produce anisotropy but enhances the process when DHGBs are used. • Detailed way out for resonance excitation is discussed. • Four peaks THz radiations can be produced for their use in medical applications. -- Abstract: We investigate the electron-positron plasma for terahertz radiation generation by two Dark Hollow Gaussian beams (DHGBs), which result in multifocal radiations quite useful for various modern applications. In this process, the ponderomotive force acts as a driver for the generation of terahertz field and the realistic situation of collisional plasma under the application of axial magnetic field reveals an efficient radiation generation. An appreciable efficiency of more than 2% is achieved for the process.