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Principles of Free-Electron Lasers pp 282–306Cite as

Optical Guiding

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Abstract

Optical guiding during the course of the interaction in free-electron lasers refers to the self-focusing of the electromagnetic wave by the electron beam [1-30]. Optical guiding of the signal occurs by two related mechanisms referred to as gain and refractive guiding. Gain guiding describes the preferential amplification of radiation in the region occupied by the electron beam. Therefore, an optical ray will undergo amplification as long as it is coincident with the beam. If it propagates out of the beam, then the interaction will cease. Refractive guiding describes the focusing (or defocusing) of the radiation by means of the shift in the refractive index due to the dielectric response of the electron beam. In particular, if the wavenumber is shifted upward due to the interaction with respect to the vacuum state, then the phase velocity of the wave decreases and the beam acts as an optical guide. It should be remarked, however, that gain and refractive guiding are intimately linked and are not independent processes.

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Authors and Affiliations

  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). Optical Guiding. In: Principles of Free-Electron Lasers. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2316-7_8

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  • DOI: https://doi.org/10.1007/978-94-011-2316-7_8

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5023-4

  • Online ISBN: 978-94-011-2316-7

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