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4 June 2002 Lasing with a near-confocal cavity in a high-power FEL
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Proceedings Volume 4632, Laser and Beam Control Technologies; (2002)
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States
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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephen V. Benson, George R. Neil, and Michelle D. Shinn "Lasing with a near-confocal cavity in a high-power FEL", Proc. SPIE 4632, Laser and Beam Control Technologies, (4 June 2002);


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