Generation of terahertz radiation by nonlinear mixing of two laser beams in overdense plasma

• Published in: Indian journal of physics Vol. 87; no. 7; pp. 699 - 703
• Main Authors: Parashar, J., Mishra, E., Mahajan, S. K.
• Format: Journal Article
• Language: English
• Published: India Springer-Verlag 01-07-2013; Springer Nature B.V
• Subjects: Astrophysics and Astroparticles; Original Paper; Physics; Physics and Astronomy; Plasma physics; Radiation; Wave equation; 52.35.Hr; Lasers mixing; Terahertz radiation; 52.38-r; Overdense plasma
• ISSN: 0973-1458; 0974-9845
• DOI: 10.1007/s12648-013-0286-4

Terahertz radiation generation by nonlinear mixing of two laser beams in an overdense plasma is investigated. The lasers penetrate into the plasma and impart oscillatory velocity to plasma electrons and exert a ponderomotive force on them at the beat frequency. The ponderomotive force has a transverse component that drives nonlinear current, producing terahertz radiation in the reflected component. The process is sensitive to the angle of incidence of the laser beams.