Theory and observation of optical guiding in a free-electron laser

Amitava Bhattacharjee, S. Y. Cai, S. P. Chang, J. W. Dodd, A. Fruchtman, T. C. Marshall

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Optical guiding in a Raman free-electron laser (FEL) is studied theoretically and experimentally. Two complimentary theoretical approaches to the problem of optical guiding in a waveguide containing a filamentary electron beam are given and shown to be in good agreement with each other in the exponential gain regime. Evidence for optical guiding of 2-mm-wavelength radiation along the electron beam in the Columbia University FEL is obtained experimentally by analysis of spatial ring-down data of the optical wave profile and compared with numerical simulations. These data are presented for the exponential gain regime. A similar experiment at signal saturation conditions shows a much less well-defined ring-down. We give plausible experimental as well as theoretical arguments why the ring-down pattern is less well defined. Based on the observations presented in this paper, it is not possible to validate optical guiding at saturation.

Original languageEnglish (US)
Pages (from-to)5081-5091
Number of pages11
JournalPhysical Review A
Issue number9
StatePublished - Jan 1 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

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    Bhattacharjee, A., Cai, S. Y., Chang, S. P., Dodd, J. W., Fruchtman, A., & Marshall, T. C. (1989). Theory and observation of optical guiding in a free-electron laser. Physical Review A, 40(9), 5081-5091.