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

Journal Article · Fri Jan 19 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.034802· OSTI ID:20861620

Watanabe, T; Wang, X J; Murphy, J B; Rose, J; Shen, Y ^[1]; Tsang, T ^[2]; Giannessi, L ^[3]; Musumeci, P ^[4]; Reiche, S ^[5]

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1. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
2. Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
3. ENEA C.R. Frascati, Via E. Fermi 45, 00044 Frascati (Italy)
4. INFN c/o Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 2, 00185 Rome (Italy)
5. Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)

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.

• OSTI ID: 20861620
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
FREE ELECTRON LASERS
NONLINEAR PROBLEMS
PHASE SPACE
SAPPHIRE
SIMULATION
SUPERRADIANCE