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

Zhang, Zhen and Chen, Yanping and Zhang, Zhelin and Xia, Tianhao and Zhang, Jiayang and Sheng, Zhengming (2021) Frequency blue shift of terahertz radiation from femtosecond laser induced air plasmas. Applied Physics B: Lasers and Optics, 127. 11. ISSN 0946-2171 (https://doi.org/10.1007/s00340-020-07566-6)

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Abstract

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.

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