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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 3 — Mar. 1, 2007
  • pp: 484–495

Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser

Juhao Wu, James B. Murphy, Paul J. Emma, Xijie Wang, Takahiro Watanabe, and Xinming Zhong  »View Author Affiliations

JOSA B, Vol. 24, Issue 3, pp. 484-495 (2007)

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In a seeded high-gain free-electron laser (FEL), where a coherent laser pulse interacts with an ultrarelativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above-mentioned two chirps are absent. We examine the interplay of these three chirps. The problem is formulated as an initial value problem and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high-gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that to get a short pulse duration, an energy chirp in the electron beam is important.

© 2007 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(140.2600) Lasers and laser optics : Free-electron lasers (FELs)
(140.3280) Lasers and laser optics : Laser amplifiers
(260.2030) Physical optics : Dispersion
(320.1590) Ultrafast optics : Chirping
(320.5520) Ultrafast optics : Pulse compression

ToC Category:
Lasers and Laser Optics

Original Manuscript: July 28, 2006
Manuscript Accepted: October 16, 2006
Published: February 15, 2007

Juhao Wu, James B. Murphy, Paul J. Emma, Xijie Wang, Takahiro Watanabe, and Xinming Zhong, "Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser," J. Opt. Soc. Am. B 24, 484-495 (2007)

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