Abstract
High-field Terahertz (THz) with a broad frequency spectrum has important application in THz optics and imaging. In this paper we report a way for generating THz fields, which uses an electron beam propagating opposite to the laser pulse. The laser excites wakefields via charge separation associate with the ponderomotive force. The laser wakefield couples with the negative energy electron beam to drive the THz electromagnetic mode. The applied magnetic field provides an additional resonance to this parametric interaction between the laser and electron beam. The THz fields of 20 GV/cm with spectrum band covering the range from 1 to 15 THz can be realized. Several scaling laws are provided to optimize the THz fields. This work provides a reasonable approach to generate THz radiation fields during intense laser-plasma interactions.
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Funding
The authors would like to thank the Department of Physics and Astrophysics, University of Delhi, India for providing computational facilities to carry out the numerical work. This work was financially supported by the Science and Engineering Research Board, Department of Science & Technology, Government of India (Grant No. CRG/2022/001989 and INT/RUS/RFBR/394) and the Institution of Eminence (IoE), University of Delhi under Faculty Research Programme Grant (Ref. No. IoE/2021/12/FRP). One of the authors (Ashish) thanks to the University Grant Commission, Government of India for financial support to carry out this work towards the Ph.D. program.
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The project was conceived by A, KG and DNG. Numerical analysis was performed by A. Discussion, analysis, interpretation, writing and validation was undertaken by A, KG, SS and DNG. All authors read and approved the final manuscript.
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Ashish, Gopal, K., Singh, S. et al. High-intensity laser pulse interaction with a counter propagating electron beam for terahertz field generation in magnetized plasmas. Opt Quant Electron 55, 605 (2023). https://doi.org/10.1007/s11082-023-04889-4
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DOI: https://doi.org/10.1007/s11082-023-04889-4