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Phys. Rev. Lett. 98, 034802 (2007) [4 pages]

Experimental Characterization of Superradiance in a Single-Pass High-Gain Laser-Seeded Free-Electron Laser Amplifier

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T. Watanabe1,*, X. J. Wang1, J. B. Murphy1, J. Rose1, Y. Shen1, T. Tsang2, L. Giannessi3, P. Musumeci4, and S. Reiche5
1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
3ENEA C.R. Frascati, Via E. Fermi 45, 00044 Frascati, Italy
4INFN c/o Dipartimento di Fisica, Università di Roma “La Sapienza”, Piazzale Aldo Moro 2, 00185 Roma, Italy
5Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA

See Also: Erratum

Received 15 September 2006; published 19 January 2007

In this Letter we report the first experimental characterization of superradiance in a single-pass high-gain free-electron laser (FEL) seeded by a 150 femtosecond (FWHM) Ti:sapphire laser. The nonlinear energy gain after an exponential gain regime was observed. We also measured the evolution of the longitudinal phase space in both the exponential and superradiant regimes. The output FEL pulse duration was measured to be as short as 81 fs, a roughly 50% reduction compared to the input seed laser. The temporal distribution of the FEL radiation as predicted by a numerical simulation was experimentally verified for the first time.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.034802
DOI:
10.1103/PhysRevLett.98.034802
PACS:
41.60.Cr, 42.25.Bs, 42.25.Kb

*Electronic address: twatanabe@bnl.gov

See Also

Comment: R. Bonifacio, F. Casagrande, D. A. Jaroszynski, B. W. McNeil, N. Piovella, and G. R. Robb, Comment on “Experimental Characterization of Superradiance in a Single-Pass High-Gain Laser-Seeded Free-Electron Laser Amplifier”, Phys. Rev. Lett. 99, 029501 (2007).

Erratum: T. Watanabe, X. J. Wang, J. B. Murphy, J. Rose, Y. Shen, T. Tsang, L. Giannessi, P. Musumeci, and S. Reiche, Erratum: Experimental Characterization of Superradiance in a Single-Pass High-Gain Laser-Seeded Free-Electron Laser Amplifier [Phys. Rev. Lett. 98, 034802 (2007)], Phys. Rev. Lett. 98, 189903 (2007).

Reply: T. Watanabe, X. J. Wang, J. B. Murphy, J. Rose, Y. Shen, T. Tsang, L. Giannessi, P. Musumeci, and S. Reiche, Watanabe et al. Reply:, Phys. Rev. Lett. 99, 029502 (2007).

 
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