Open AccessExperimental Demonstration of Enhanced Self-Amplified Spontaneous Emission by an Optical Klystron
Author(s) -
G. Penco,
E. Allaria,
G. De Ninno,
Eugenio Ferrari,
L. Giannessi
Publication year - 2015
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.114.013901
Subject(s) - undulator , klystron , physics , free electron laser , laser , atomic physics , amplified spontaneous emission , spontaneous emission , extreme ultraviolet , fermi gamma ray space telescope , cathode ray , electron , optics , free electron model , range (aeronautics) , modulation (music) , beam (structure) , nuclear physics , materials science , astrophysics , composite material , acoustics
We report the first experimental evidence of enhancement of self-amplified spontaneous emission, due to the use of an optical klystron. In this free-electron laser scheme, a relativistic electron beam passes through two undulators, separated by a dispersive section. The latter converts the electron-beam energy modulation produced in the first undulator in density modulation, thus enhancing the free-electron laser gain. The experiment has been carried out at the FERMI facility in Trieste. Powerful radiation has been produced in the extreme ultraviolet range, with an intensity a few orders of magnitude larger than in pure self-amplified spontaneous emission mode. Data have been benchmarked with an existing theoretical model