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Proceedings Paper

Lasing with a near-confocal cavity in a high-power FEL
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Paper Abstract

Lasing at high power in FELs has been achieved so far only with a near-concentric resonator [1]. Though this design can scale up to quite high power, it is ultimately limited by the mirror steering stability as the resonator design approaches con-centricity. This constraint may be avoided by using a near-confocal resonator operated in a ring configuration. It is found that, if a small amount of gain focusing is present, the near-confocal resonator eigenmodes are modified such that the lowest order mode collapses around the electron beam and is large in the return (non-focusing) direction. This eigenmode is stable and is relatively insensitive to changes in the mirror radii of curvature and the strength of the electron beam focusing. This paper will present the theory of this new concept.

Paper Details

Date Published: 4 June 2002
PDF: 7 pages
Proc. SPIE 4632, Laser and Beam Control Technologies, (4 June 2002); doi: 10.1117/12.469762
Show Author Affiliations
Stephen V. Benson, Thomas Jefferson National Lab. (United States)
George R. Neil, Thomas Jefferson National Lab. (United States)
Michelle D. Shinn, Thomas Jefferson National Lab. (United States)

Published in SPIE Proceedings Vol. 4632:
Laser and Beam Control Technologies
Santanu Basu; James F. Riker, Editor(s)

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