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Open AccessArticle

Few-Cycle Infrared Pulse Evolving in FEL Oscillators and Its Application to High-Harmonic Generation for Attosecond Ultraviolet and X-ray Pulses

National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki 3191106, Japan
Atoms 2021, 9(1), 15; https://doi.org/10.3390/atoms9010015
Received: 11 January 2021 / Revised: 19 February 2021 / Accepted: 19 February 2021 / Published: 24 February 2021
(This article belongs to the Special Issue Collective Atomic and Free-Electron Lasing)
Generation of few-cycle optical pulses in free-electron laser (FEL) oscillators has been experimentally demonstrated in FEL facilities based on normal-conducting and superconducting linear accelerators. Analytical and numerical studies have revealed that the few-cycle FEL lasing can be explained in the frame of superradiance, cooperative emission from self-bunched systems. In the present paper, we review historical remarks of superradiance FEL experiments in short-pulse FEL oscillators with emphasis on the few-cycle pulse generation and discuss the application of the few-cycle FEL pulses to the scheme of FEL-HHG, utilization of infrared FEL pulses to drive high-harmonic generation (HHG) from gas and solid targets. The FEL-HHG enables one to explore ultrafast science with attosecond ultraviolet and X-ray pulses with a MHz repetition rate, which is difficult with HHG driven by solid-state lasers. A research program has been launched to develop technologies for the FEL-HHG and to conduct a proof-of-concept experiment of FEL-HHG. View Full-Text
Keywords: free-electron laser; superradiance; few-cycle pulse; high-harmonic generation free-electron laser; superradiance; few-cycle pulse; high-harmonic generation
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MDPI and ACS Style

Hajima, R. Few-Cycle Infrared Pulse Evolving in FEL Oscillators and Its Application to High-Harmonic Generation for Attosecond Ultraviolet and X-ray Pulses. Atoms 2021, 9, 15. https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9010015

AMA Style

Hajima R. Few-Cycle Infrared Pulse Evolving in FEL Oscillators and Its Application to High-Harmonic Generation for Attosecond Ultraviolet and X-ray Pulses. Atoms. 2021; 9(1):15. https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9010015

Chicago/Turabian Style

Hajima, Ryoichi. 2021. "Few-Cycle Infrared Pulse Evolving in FEL Oscillators and Its Application to High-Harmonic Generation for Attosecond Ultraviolet and X-ray Pulses" Atoms 9, no. 1: 15. https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9010015

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