Frequency blue shift of terahertz radiation from femtosecond laser induced air plasmas

Zhen Zhang, Yanping Chen, Zhelin Zhang, Tianhao Xia, Jiayang Zhang, Zhengming Sheng

Research output: Contribution to journalArticlepeer-review


The peak frequency of the terahertz radiation generated from the femtosecond laser-induced air plasmas is blue shifted with the increased second harmonics intensity when a high voltage is added upon the air plasmas. This blue shift is the result of the DC-biased field from the high voltage plus the AC-biased field from the second harmonics, indicating that this terahertz radiation frequency peak is tunable by varying the two field components. This tunable frequency peak is significant to various applications such as remote sensing and material characterization.

Original languageEnglish
Article number11
Number of pages5
JournalApplied Physics B: Lasers and Optics
Early online date8 Jan 2021
Publication statusE-pub ahead of print - 8 Jan 2021


  • terahertz radiation
  • emtosecond laser-induced air plasmas
  • high voltage

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