Abstract-Dark hollow beams originating terahertz radiation in corrugated plasma under magnetic field

Physics of Plasmas

Hitendra K. Malik,  Sheetal Punia,

Deviation of normalized THz field for different beam orders with collisional frequency orders by taking parameters: b = 0.001 cm, na/no = 0.3, ω = 1.5*ωp, and external magnetic field B = 4 T.

https://aip.scitation.org/doi/abs/10.1063/1.5090814

In the present process, two laser beams having the same doughnut profiles but different frequencies are explored in space-periodic nonlinear plasma to produce nonlinear oscillatory current that resonantly excites the terahertz (THz) radiation. The interactions are assumed to be under the effect of external magnetic field and electron-neutral collisions. The intensity gradient of the considered dark hollow beams has a doughnut-shaped distribution, which is responsible for the multifocal field profile of the emitted THz radiation. The present scheme is capable of producing laser-to-THz energy conversion efficiency up to ∼10−3 with the optimization of various laser and plasma parameters even in the presence of electron-neutral collisions.