### Abstract

We develop a theoretical model for terahertz (THz) radiation generation, when an intense short laser pulse (ω1, k 1) is mixed with its frequency shifted second harmonic (ω2, k 2), 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, 2k 1) and (ω2 − ω1, k 2 − k 1). These density perturbations couple with the oscillatory velocities of the electron due to the lasers and produce a nonlinear current at (ω2 − 2ω1, k 2 − 2k 1). This current acts as an antenna to produce the THz radiation. The THz power depends upon the square of plasma density and , where I 1 and I 2 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.

Original language | English |
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Pages (from-to) | 473-479 |

Number of pages | 7 |

Journal | Laser and Particle Beams |

Volume | 33 |

Issue number | 03 |

DOIs | |

Publication status | Published - 1 Sep 2015 |

### Keywords

- two-colour laser
- plasma filament
- terahertz radaiation

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## Cite this

Magesh Kumar, K. K., Kumar, M., Yuan, T., Sheng, Z. M., & Chen, M. (2015). Terahertz radiation from plasma filament generated by two-color laser gas–plasma interaction.

*Laser and Particle Beams*,*33*(03), 473-479. https://doi.org/10.1017/S0263034615000518