Abstract
Terahertz (THz) radiation sources are increasingly significant for many scientific frontiers, while the generation of THz radiation with high-power at wide-tunable frequencies is still a limitation for most existing methods. In this paper, a compact accelerator-based light source is proposed to produce coherent THz radiation with high pulse energy and tunable frequency from 0.1 THz to 60 THz. By using a frequency beating laser-modulated electron beam and undulator taper, intense coherent THz radiation can be generated through undulators. Theoretical analysis and numerical simulations demonstrate that the proposed technique can generate narrow-bandwidth THz radiation with a pulse energy up to 6.3 millijoule (mJ) and the three-dimensional effects of beam has limited influence on its performance. The proposed technique will open up new opportunities for THz spectroscopic and time-resolved experiments.
Highlights
Terahertz (THz) radiation contributes to many scientific frontiers by serving as a nonionizing probe in nonlinear optics, pump experiments, spectroscopic, and time-resolved applications [1,2,3]
Many fantastic scientific applications such as THz-assisted high-order harmonic generation, THztriggered chemistry, and single-shot THz bioimaging require THz radiation with pulse energy up to millijoule level [4,5,6], which remains a challenge for most THz generation methods
The prominent methods to generate high-power THz pulses are generally based on the ultrafast laser techniques [7,8,9,10,11], laser-produced plasmas techniques [12,13,14,15,16,17], or electron accelerator-based methods
Summary
Terahertz (THz) radiation contributes to many scientific frontiers by serving as a nonionizing probe in nonlinear optics, pump experiments, spectroscopic, and time-resolved applications [1,2,3]. A dedicated compact light source based on electron beam manipulation is proposed for generating mJ-level high energy radiation pulses with a tunable frequency from 0.1 THz to 60 THz. In this proposal, the pulse shaping and chirped frequency beating techniques [20,46] are utilized, and two cogenetic chirped laser pulses are employed to form optical heterodyning, obtaining the quasi-sinusoidal optical signal at THz wavelength. This proposal can be realized by using a compact accelerator facility with the electron beam energy of tens of MeV and mature accelerator and laser technologies
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