Generation of Coherent Broadband Photon Pulses with a Cascaded Longitudinal Space-Charge Amplifier

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Generation of Coherent Broadband Photon Pulses with a Cascaded Longitudinal Space-Charge Amplifier

A. Marinelli, E. Hemsing, M. Dunning, D. Xiang, S. Weathersby, F. O’Shea, I. Gadjev, C. Hast, and J. B. Rosenzweig

Phys. Rev. Lett. 110, 264802 – Published 27 June 2013

Abstract

The longitudinal space-charge amplifier has been recently proposed by Schneidmiller and Yurkov as an alternative to the free-electron laser instability for the generation of intense broadband radiation pulses [Phys. Rev. ST Accel. Beams 13, 110701 (2010)]. In this Letter, we report on the experimental demonstration of a cascaded longitudinal space-charge amplifier at optical wavelengths. Although seeded by electron beam shot noise, the strong compression of the electron beam along the three amplification stages leads to emission of coherent undulator radiation pulses exhibiting a single spectral spike and a single transverse mode. The on-axis gain is estimated to exceed 4 orders of magnitude with respect to spontaneous emission.

Received 11 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.264802

Authors & Affiliations

A. Marinelli^1,*, E. Hemsing², M. Dunning², D. Xiang², S. Weathersby², F. O’Shea¹, I. Gadjev¹, C. Hast², and J. B. Rosenzweig¹

¹Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
²SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA