Journal Article10.1016/j.nima.2023.168530
Tunable frequency comb from echo-enabled harmonic generation free electron laser
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TL;DR: In this paper , a tunable soft x-ray frequency comb in a seeded free-electron laser (FEL) via the chirped pulse beating technology was proposed.
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Abstract: We propose a novel scheme for the generation of a tunable soft x-ray frequency comb in a seeded free-electron laser (FEL) via the chirped pulse beating technology. Our research shows that harnessing the chirped pulse laser to imprint a submillimeter-scale energy modulation in the phase space of the relativistic electron beam together with the process of echo-enabled effect, multichromatic output soft x-ray radiation with a series of longitudinal modes can be amplified in an echo-enabled harmonic generation (EEHG) free electron laser, which finally forms a comb-liked shape in the frequency spectrum with the mode spacing frequency at terahertz (THz) band. Based on the theoretical and numerical analyses of the modulation process, the electron beam maintains a nanometer-scale microstructures due to the echo effect, while the beam obtains an energy modulation at submillimeter-scale from the chirped pulse beating laser. This leads to a series of longitudinal modes in the downstream radiator. Three-dimension time-dependent simulation results show that a frequency comb with a central wavelength of 8.9 nm can be generated directly with the help of chirped beating laser. The frequency spacing between the frequency lines on the radiation spectrum can be tuned easily by changing the parameters of chirped beating laser.
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Citations
Tunable X-ray frequency comb generation at the Shanghai soft X-ray Free-Electron Laser facility
Lanpeng Ni,Yaozong Xiao,Zheng Qi,Chao Feng,Zhentang Zhao +4 more
TL;DR: Researchers at the Shanghai soft X-ray Free-Electron Laser facility generate tunable X-ray frequency combs with 1.5 GW peak power, 284 eV central photon energy, and 7-12 THz repetition frequencies using a chirped frequency-beating laser and echo-enabled harmonic generation.
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TL;DR: The frequency comb generated by a femtosecond mode-locked laser is used and broadened to more than an optical octave in a photonic crystal fiber to realize a frequency chain that links a 10 MHz radio frequency reference phase-coherently in one step to the optical region.
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Demonstration of self-seeding in a hard-X-ray free-electron laser
J. Amann,William Berg,Vladimir Blank,F.-J. Decker,Y. Ding,P. Emma,Yiping Feng,J. Frisch,David Fritz,Jerome B. Hastings,Zhirong Huang,Jacek Krzywinski,Ryan Lindberg,H. Loos,Alberto Lutman,Heinz-Dieter Nuhn,Daniel Ratner,J. Rzepiela,Deming Shu,Yu. V. Shvyd'ko,Simone Spampinati,Stanislav Stoupin,Sergey Terentyev,Emil Trakhtenberg,D.R. Walz,J. Welch,Jihuai Wu,Alexander Zholents,Diling Zhu +28 more
TL;DR: In this article, the first half of the magnetic undulator was used to seed the second half via a diamond-based monochromator at angstrom wavelengths, which is a technique similar to ours.
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TL;DR: This review takes a tutorial approach to illustrate how 20 years of source development and technology has facilitated the journey of optical frequency combs from the lab into the field, and a view to the future with these technologies.
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