Coherent terahertz radiation with orbital angular momentum by helically microbunched electron beam

A scheme to generate coherent terahertz (THz) radiation carrying orbital angular momentum (OAM) through down-frequency conversion of optical lasers and higher order mode coupling is proposed and analyzed. Based on the laser–electron interaction in the undulator under a linear regime, the scheme util...

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Bibliographic Details
Published in:AIP advances 2021-05, Vol.11 (5), p.055115-055115-6
Main Authors: Zhang, Haoran, Wang, Wenxing, Jiang, Shimin, Li, Cheng, He, Zhigang, Zhang, Shancai, Jia, Qika, Wang, Lin, He, Duohui
Format: Article
Language:English
Subjects:
Angular momentum
Coupled modes
Dispersion
Electron beams
Electrons
Laser beams
Lasers
Radiators
Terahertz frequencies
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Summary:A scheme to generate coherent terahertz (THz) radiation carrying orbital angular momentum (OAM) through down-frequency conversion of optical lasers and higher order mode coupling is proposed and analyzed. Based on the laser–electron interaction in the undulator under a linear regime, the scheme utilizes dual-frequency lasers resonating at the harmonics of two consecutive undulators and a dispersion section to impose a THz helical microbunching in the electron beam. By choosing appropriate parameters of lasers and dispersion section, the density modulation can be down-converted to a THz spectral-domain and the central frequency can be extensively tuned together with the helical mode number. Then, the helically microbunched beam can be used as a source of THz OAM radiation in a downstream radiator. We expect that the intense vortex beam in the terahertz band will bring new opportunities for the research of quantum topological materials.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0052083