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Terahertz radiation from plasma filament generated by two-color laser gas–plasma interaction

Published online by Cambridge University Press:  10 June 2015

K. K. Magesh Kumar ,
M. Kumar ,
T. Yuan ,
Z. M. Sheng  and
M. Chen
K. K. Magesh Kumar*
Affiliation:
Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
M. Kumar
Affiliation:
WCI Center for Quantum-Beam-based Radiation Research, KAERI, Daejeon, Korea
T. Yuan
Affiliation:
Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
Z. M. Sheng
Affiliation:
Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China SUPA, Department of Physics, University of Strathclyde, Glasgow, United Kingdom
M. Chen*
Affiliation:
Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
*
Address correspondence and reprint requests to: K. K. Magesh Kumar and M. Chen, Key Laboratory for Laser Plasmas, Shanghai Jiao Tong University, Shanghai 200240, China. Email: mageshkumar2006@gmail.com; minchen@sjtu.edu.cn
Address correspondence and reprint requests to: K. K. Magesh Kumar and M. Chen, Key Laboratory for Laser Plasmas, Shanghai Jiao Tong University, Shanghai 200240, China. Email: mageshkumar2006@gmail.com; minchen@sjtu.edu.cn
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Abstract

We develop a theoretical model for terahertz (THz) radiation generation, when an intense short laser pulse (ω1, k1) is mixed with its frequency shifted second harmonic (ω2, k2), where ω2 = 2ω1 + ωT and ωT is in the THz range in the plasma. The lasers exert a ponderomotive force on the electrons and drive density perturbations at (2ω1, 2k1) and (ω2 − ω1, k2 − k1). These density perturbations couple with the oscillatory velocities of the electron due to the lasers and produce a nonlinear current at (ω2 − 2ω1, k2 − 2k1). This current acts as an antenna to produce the THz radiation. The THz power depends upon the square of plasma density and $I_1^2 {I_2}$, where I1 and I2 are the intensities of fundamental and second harmonic laser. The radiation is mainly along the forward direction. Two-dimensional particle-in-cell simulations are used to study the near-field radiation properties.

Keywords

Two-color laserPlasma filamentTerahertz radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 3 , September 2015 , pp. 473 - 479
Copyright
Copyright © Cambridge University Press 2015 

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