DocumentCode
1104799
Title
Measurement of stimulated transverse mode mixing in a free electron laser
Author
Deacon, D.A.G. ; Elleaume, P. ; Xie, M. ; Bazin, C. ; Bergher, M. ; Billardon, M. ; Girard, B. ; Madey, J.M.J. ; Ortega, J.-M. ; Petroff, Y. ; Robinson, K.E. ; Velghe, M.
Author_Institution
Deacon Research, Palo Alto, CA, USA
Volume
21
Issue
3
fYear
1985
fDate
3/1/1985 12:00:00 AM
Firstpage
208
Lastpage
215
Abstract
We report the first measurement of the off-diagonal terms in the transverse gain matrix in a free electron laser. We show that the higher order transverse modes stimulated in the FEL interaction diminish in amplitude as the electron beam size is increased, that the far field and the near field effects of the excited modes are not equivalent, and that in this low divergence case, the mode mixing is insensitive to the resonance parameter. Remarkably close agreement is demonstrated with the theory [1]. The effects of a multiple mode input beam are also observed, and the theoretical expression is derived.
Keywords
Free electron lasers; Laser measurements; Laser modes; Apertures; Electron beams; Electron optics; Free electron lasers; Gain measurement; Laser excitation; Laser modes; Optical amplifiers; Optical mixing; Stimulated emission;
fLanguage
English
Journal_Title
Quantum Electronics, IEEE Journal of
Publisher
ieee
ISSN
0018-9197
Type
jour
DOI
10.1109/JQE.1985.1072634
Filename
1072634
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