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Oscillator Configurations

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Principles of Free-Electron Lasers

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Abstract

In the previous chapters it has been shown that an energetic electron beam propagating through an undulatory magnetic field is capable of amplifying electromagnetic radiation. That is, the combination of the beam and the undulatory field can be regarded as a medium with an inherent gain. The principal focus of the discussion in the previous chapters has been on the amplification of an injected signal with a specified frequency. However, the gain mechanism can also be used to form an oscillator by the feedback of a portion of the output signal. The radiation in an oscillator may be self-excited in the sense that radiation will grow spontaneously from noise in the oscillator if the gain the radiation experiences on traversing the interaction region exceeds the losses the radiation experiences on its return path to the input of the interaction region (including the portion of the radiation that is allowed to leave the oscillator as output). An oscillator mayaiso be mode-locked by the injection of a large-amplitude signal with a frequency within the gain band.

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  1. Science Applications International Corporation, McLean, Virginia, USA

    H. P. Freund

  2. University of Maryland, College Park, Maryland, USA

    T. M. Antonsen Jr.

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© 1992 H. P. Freund and T. M. Antonsen, Jr

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Freund, H.P., Antonsen, T.M. (1992). Oscillator Configurations. In: Principles of Free-Electron Lasers. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2316-7_9

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  • DOI: https://doi.org/10.1007/978-94-011-2316-7_9

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