Open AccessOperation of higher harmonic oscillations in free-electron lasers
Author(s) -
N. Sei,
Hiroshi Ogawa,
Kenichi Yamada
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.000308
Subject(s) - physics , harmonics , optics , oscillation (cell signaling) , free electron laser , resonator , harmonic , laser , high harmonic generation , electron , cathode ray , atomic physics , beam (structure) , harmonic oscillator , free electron model , nuclear physics , quantum mechanics , voltage , genetics , biology
We report for the first time the experimental achievement of a seventh-harmonic free-electron laser (FEL) oscillation. The measured FEL gains and average FEL powers for higher harmonics were identical to those calculated by a one-dimensional FEL theory. The measured linewidths of the higher-harmonic FELs were narrower than that of the fundamental FEL owing to the narrower spectral widths of the spontaneous emissions. By applying the higher-harmonic FEL oscillation to a resonator-type FEL with an advanced accelerator, an x-ray FEL oscillator can be realized at lower electron-beam energy.