Tunable few-cycle and multicycle coherent terahertz radiation from relativistic electrons

We report the generation of tunable, narrow-band, few-cycle and multicycle coherent terahertz (THz) pulses from a temporally modulated relativistic electron beam. We demonstrate that the frequency of the THz radiation and the number of the oscillation cycles of the THz electric field can be tuned by...

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Bibliographic Details
Published in:Physical review letters 2011-11, Vol.107 (20), p.204801-204801, Article 204801
Main Authors: Shen, Yuzhen, Yang, Xi, Carr, G L, Hidaka, Yoshiteru, Murphy, James B, Wang, Xijie
Format: Article
Language:English
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Summary:We report the generation of tunable, narrow-band, few-cycle and multicycle coherent terahertz (THz) pulses from a temporally modulated relativistic electron beam. We demonstrate that the frequency of the THz radiation and the number of the oscillation cycles of the THz electric field can be tuned by changing the modulation period of the electron beam through a temporally shaped photocathode drive laser. The central frequency of the THz spectrum is tunable from ∼0.26 to 2.6 THz with a bandwidth of ∼0.16  THz.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.204801