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

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T. Watanabe,¹ X. J. Wang,¹ J. B. Murphy,¹ J. Rose,¹ Y. Shen,¹ T. Tsang,² L. Giannessi,³ P. Musumeci,⁴ 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

Inthis Letter we report the first experimental characterization of superradiancein a single-pass high-gain free-electron laser (FEL) seeded by a150 femtosecond (FWHM) Ti:sapphire laser. The nonlinear energy gain afteran exponential gain regime was observed. We also measured theevolution of the longitudinal phase space in both the exponentialand superradiant regimes. The output FEL pulse duration was measuredto be as short as 81 fs, a roughly 50% reductioncompared to the input seed laser. The temporal distribution ofthe FEL radiation as predicted by a numerical simulation wasexperimentally verified for the first time.

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 41.60.Cr Free-electron lasers 42.25.Bs Optical wave propagation, transmission and absorption 42.25.Kb Optical coherence YEAR: 2007

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Erratum

Erratum: Experimental Characterization of Superradiance in a Single-Pass High-Gain Laser-Seeded Free-Electron Laser Amplifier [Phys. Rev. Lett. 98, 034802 (2007)]
T. Watanabe, X. J. Wang, J. B. Murphy et al.
Phys. Rev. Lett. 98, 189903 (E) (2007)