High-Gain Small-Signal Modes Of The Free-Electron Laser

Gerald T. Moore

doi:10.1117/12.976118

20 November 1985 High-Gain Small-Signal Modes Of The Free-Electron Laser

Gerald T. Moore

Proceedings Volume 0540, Southwest Conf on Optics '85; (1985) https://doi.org/10.1117/12.976118
Event: 1985 Albuquerque Conferences on Optics, 1985, Albuquerque, United States

Abstract

When the free-electron laser (FEL) is operated as a high-gain amplifier, amplification of the unsaturated laser field in the first part of the wiggler is described in terms of exponentially growing modes whose transverse profile is independent of longitudinal position. We describe the dependence of the mode profiles and the gain on the physical parameters of the FEL, including the effects of electron energy spread. It is found that the gain and the tolerance of the gain to energy spread increase slowly as the electron beam radius is decreased to a diffraction-dominated regime. There is a much greater increase in the gain bandwidth. Tuning the electron energy above resonance spreads out the mode profiles, while tuning the energy below resonance concentrates the laser modes within the electron beam.

Citation Download Citation

Gerald T. Moore "High-Gain Small-Signal Modes Of The Free-Electron Laser", Proc. SPIE 0540, Southwest Conf on Optics '85, (20 November 1985); https://doi.org/10.1117/12.976118

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