Resonant terahertz radiation from warm collisional inhomogeneous plasma irradiated by two Gaussian laser beams

Journal Article · Sun May 15 04:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4949344· OSTI ID:22600210

Banjafar, M. R.; Jahangiri, F.; Barzegar, S.; Massudi, R. ^[1]

---

1. Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran (Iran, Islamic Republic of)

Terahertz (THz) radiation generation by the interaction of two co-propagating high intensity laser beams with a warm collisional inhomogeneous plasma is analytically investigated. By presenting the dielectric permittivity of plasma and taking into account the ponderomotive force, the nonlinear current at THz frequency is obtained. A secondary resonant enhancement of THz radiation is observed, in addition to that occurs at the plasma frequency, which can be tuned by plasma density and temperature. Moreover, we show that for each beat frequency, there exists an optimum temperature at which THz radiation is maximized. It is also shown that the power and efficiency of THz radiation decrease by increasing the collision frequency.

• OSTI ID: 22600210
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
COLLISIONS
DIELECTRIC MATERIALS
GAUSSIAN PROCESSES
INHOMOGENEOUS PLASMA
IRRADIATION
LANGMUIR FREQUENCY
LASERS
NONLINEAR PROBLEMS
PERMITTIVITY
PLASMA DENSITY
PONDEROMOTIVE FORCE