Dual-frequency terahertz emission from splitting filaments induced by lens tilting in air

Zhelin Zhang, Yanping Chen, Liu Yang, Xiaohui Yuan, Feng Liu, Min Chen, Jianqiu Xu, Zhengming Sheng, Jie Zhang

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Dual-frequency terahertz radiation from air-plasma filaments produced with two-color lasers in air has been demonstrated experimentally. When a focusing lens is tilted for a few degrees, it is shown that the laser filament evolves from a single one to two sub-filaments. Two independent terahertz sources emitted from the sub-filaments with different frequencies and polarizations are identified, where the frequency of terahertz waves from the trailing sub-filament is higher than that from the leading sub-filament.
Original languageEnglish
Article number101110
Number of pages4
JournalApplied Physics Letters
Issue number10
Early online date11 Sep 2014
Publication statusPublished - 11 Sep 2014


  • dual-frequency terahertz radiation
  • air-plasma filaments
  • independent terahertz sources

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