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Title: Femtosecond free-electron laser by chirped pulse amplification

Abstract

In this work we combine elements of chirped pulse amplification techniques, now familiar in solid-state lasers, with an amplifier based upon a seeded free-electron laser (FEL). The resulting device would produce amplified pulses of unprecedented brevity at wavelengths shorter than can be currently obtained by any tunable laser system. We use a subharmonically seeded FEL to illustrate the concept. Radiation from a Ti:sapphire laser is frequency tripled and stretched optically to provide a coherent seed pulse for the FEL. When coupled to an electron beam inside a magnetic wiggler, the seed radiation introduces an additional energy modulation on the electron bunch, which has been prepared with an energy chirp to match the chirp in the optical pulse. The energy modulated electrons are then spatially bunched in a dispersion magnet and introduced to a wiggler configured to be resonant to a harmonic of the seed laser, providing additional frequency multiplication. The coherent radiation produced by these electrons is amplified as it traverses the wiggler and is recompressed optically. The preservation of phase coherence provided by this scheme results in a device which can yield 4-fs pulses with 0.3 mJ at a central wavelength of ca. 8 nm, easily the shortest durationmore » of amplified pulses produced by any laser. In this paper we discuss various aspects of the concept, including the generation of short pulses, temporal stretching and compression, and potential applications of the device. The phase distortion during the wide bandwidth FEL amplification is discussed in detail, and is shown to be within the bounds required to produce a 4-fs pulse upon compression.« less

Authors:
; ;  [1];  [2]
  1. (National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States))
  2. (Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109-2099 (United States))
Publication Date:
OSTI Identifier:
7071879
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; (United States)
Additional Journal Information:
Journal Volume: 49:5; Journal ID: ISSN 1063-651X
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; FREE ELECTRON LASERS; DESIGN; AMPLIFICATION; COUPLING; ELECTRON BEAMS; FEASIBILITY STUDIES; POWER DENSITY; PULSE AMPLIFIERS; SOLID STATE LASERS; AMPLIFIERS; BEAMS; ELECTRONIC EQUIPMENT; EQUIPMENT; LASERS; LEPTON BEAMS; PARTICLE BEAMS; 426002* - Engineering- Lasers & Masers- (1990-)

Citation Formats

Yu, L.H., Johnson, E., Li, D., and Umstadter, D. Femtosecond free-electron laser by chirped pulse amplification. United States: N. p., 1994. Web. doi:10.1103/PhysRevE.49.4480.
Yu, L.H., Johnson, E., Li, D., & Umstadter, D. Femtosecond free-electron laser by chirped pulse amplification. United States. doi:10.1103/PhysRevE.49.4480.
Yu, L.H., Johnson, E., Li, D., and Umstadter, D. Sun . "Femtosecond free-electron laser by chirped pulse amplification". United States. doi:10.1103/PhysRevE.49.4480.
@article{osti_7071879,
title = {Femtosecond free-electron laser by chirped pulse amplification},
author = {Yu, L.H. and Johnson, E. and Li, D. and Umstadter, D.},
abstractNote = {In this work we combine elements of chirped pulse amplification techniques, now familiar in solid-state lasers, with an amplifier based upon a seeded free-electron laser (FEL). The resulting device would produce amplified pulses of unprecedented brevity at wavelengths shorter than can be currently obtained by any tunable laser system. We use a subharmonically seeded FEL to illustrate the concept. Radiation from a Ti:sapphire laser is frequency tripled and stretched optically to provide a coherent seed pulse for the FEL. When coupled to an electron beam inside a magnetic wiggler, the seed radiation introduces an additional energy modulation on the electron bunch, which has been prepared with an energy chirp to match the chirp in the optical pulse. The energy modulated electrons are then spatially bunched in a dispersion magnet and introduced to a wiggler configured to be resonant to a harmonic of the seed laser, providing additional frequency multiplication. The coherent radiation produced by these electrons is amplified as it traverses the wiggler and is recompressed optically. The preservation of phase coherence provided by this scheme results in a device which can yield 4-fs pulses with 0.3 mJ at a central wavelength of ca. 8 nm, easily the shortest duration of amplified pulses produced by any laser. In this paper we discuss various aspects of the concept, including the generation of short pulses, temporal stretching and compression, and potential applications of the device. The phase distortion during the wide bandwidth FEL amplification is discussed in detail, and is shown to be within the bounds required to produce a 4-fs pulse upon compression.},
doi = {10.1103/PhysRevE.49.4480},
journal = {Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; (United States)},
issn = {1063-651X},
number = ,
volume = 49:5,
place = {United States},
year = {1994},
month = {5}
}