Spectral tuning of broadband terahertz radiation from dc-biased laser plasma filaments.
- Resource Type
- Article
- Authors
- Zhang, Jiayang; Zhang, Zhelin; Zhang, Zhen; Xia, Tianhao; Wang, Linzheng; Wang, Chen; Chen, Liming; Chen, Yanping
- Source
- Applied Physics Letters. 11/13/2023, Vol. 123 Issue 20, p1-7. 7p.
- Subject
- *SUBMILLIMETER waves
*LASER plasmas
*FIBERS
*PLASMA density
*LASER beams
*REDSHIFT
- Language
- ISSN
- 0003-6951
Terahertz radiation from laser plasmas exhibits a broadband spectrum, making it a bright prospect for terahertz spectroscopy. In this work, we demonstrate that the continuous redshift of terahertz radiation from a dc-biased plasma filament can be achieved by increasing the length of the plasma filament. A theoretical model concerning a Lorentz distribution of the plasma density along a filament is proposed to interpret this spectral tuning effect. This finding provides not only an approach to spectral tuning but also a gentle way of diagnosing the distribution of the plasma density inside such plasmas. [ABSTRACT FROM AUTHOR]