Results and analysis of free-electron-laser oscillation in a high-energy storage ring
- 1 July 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (2) , 1301-1315
- https://doi.org/10.1103/physreva.44.1301
Abstract
A storage-ring free-electron laser at Orsay has been operating since 1989 in the visible wavelength range. In contrast with previous experiments, it operates with positrons and at higher energies (600–800 MeV), with the storage ring Super-ACO (ACO denotes Anneau de Collisions d’Orsay). The optical gain, the laser power, the transverse profile, and the macrotemporal structure of the laser are analyzed. In particular, we show that the gain matrix possesses many off-diagonal elements, which results in lasing on a combination of noncylindrical Gaussian modes. The eigenmode of the laser oscillation is a combination of one or two main Gaussian modes and several higher-order modes, which results in most of the power being extracted in these modes.Keywords
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