CONCEPTUAL DESIGN OF BESSEL BEAM CAVITY FOR FREE-ELECTRON LASER

Authors: Li, D.; Imasaki, K.; Miyamoto, S.; Amano, S.; Mochizuki, T.

Source: International Journal of Infrared and Millimeter Waves, Volume 27, Number 2, February 2006 , pp. 165-171(7)

Publisher: Springer

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Abstract:

The conventional cavity for a free-electron laser (FEL) oscillator usually forms an optical beam of Gaussian mode, which undergoes transverse spread along the interaction region. The transverse divergence of an optical beam will induce reduction of the FEL gain from three aspects: degenerating filling factor, causing diffraction loss and limiting the effective interaction distance. Bessel optical beam has been experimentally demonstrated diffraction-free characteristics in its propagation, which provides a possibility of improvement of FEL gain. In this paper, we present a conceptual design of a Bessel beam cavity for the free-electron laser oscillator. This cavity generates nondiffracting optical beam in the wiggler, resulting in improving the filling factor, decreasing the diffraction loss and elongating the effective interaction distance.

Keywords: free electron laser; Gaussian beam cavity; Bessel beam cavity; diffraction-free; filling factor; diffraction loss

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10762-006-9067-x

Publication date: 2006-02-01