Tunable circularly polarized terahertz radiation from magnetized gas plasma

W.-M. Wang, P. Gibbon, Z.-M. Sheng, Y.-T. Li

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It is shown, by simulation and theory, that circularly or elliptically polarized terahertz radiation can be generated when a static magnetic (B) field is imposed on a gas target along the propagation direction of a two-color laser driver. The radiation frequency is determined by ω2p+ω2c/4−−−−−−−−√+ωc/2, where ωp is the plasma frequency and ωc is the electron cyclotron frequency. With the increase of the B field, the radiation changes from a single-cycle broadband waveform to a continuous narrow-band emission. In high-B-field cases, the radiation strength is proportional to ω2p/ωc. The B field provides a tunability in the radiation frequency, spectrum width, and field strength.
Original languageEnglish
Article number253901
Number of pages5
JournalPhysical Review Letters
Issue number25-26
Publication statusPublished - 23 Jun 2015


  • elliptically polarized terahertz radiation
  • two-color laser driver
  • radiation frequency
  • spectrum width
  • field strength


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