Spectral control of terahertz radiation from inhomogeneous plasma filaments by tailoring two-color laser beams

Wang Sheng, Fu Tang, Zhelin Zhang, Yanping Chen, Xiao Yu Peng, Zheng Ming Sheng

Research output: Contribution to journalArticlepeer-review

Abstract

Terahertz (THz) radiation from an inhomogeneous plasma filament generated by focusing two-color femtosecond laser pulses into argon gas filled in a chamber is investigated experimentally by tailoring the Gaussian pump laser beams with an iris, where broadband THz emission over 10 THz is produced. It is found that the collected far-field THz radiation includes not only coherent but also partial-coherent components of the THz waves, which are emitted from the different parts of the inhomogeneous plasma filament with different plasma densities, contributing correspondingly to the different frequencies of the THz spectrum. Our results suggest that the THz spectrum can be manipulated by controlling the plasma density distribution of the filaments.

Original languageEnglish
Pages (from-to)8676-8684
Number of pages9
JournalOptics Express
Volume29
Issue number6
DOIs
Publication statusPublished - 5 Mar 2021

Keywords

  • spectral control
  • terahertz radiation
  • inhomogeneous plasma filaments
  • laser beams

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