Experimental characterization of superradiance in a single-pass high-gain laser-seeded free-electron laser amplifier

T. Watanabe, X.J. Wang, J.B. Murphy, J. Rose, Y. Shen, T. Tsang, L. Giannessi, P. Musumeci, S. Reiche

Research output: Contribution to journalArticle

44 Citations (Scopus)


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.
Original languageEnglish
Article number034802
Pages (from-to)-
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 2007
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this