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ISSN - 00189197, IEEE Journal of Quantum Electronics, 1985, vol. QE-21, 7, p. 1023-1025

EFFECTIVE NARROWING OF THE SPECTRAL DISTRIBUTION AT MULTIPLE PASSAGE OF PHOTONS THROUGH A FREE ELECTRON LASER (FEL).

Baier V. N., Mil'shtein A. I.

It is shown that the spectral density at the center of the radiation line is effectively increased if the gain of a free-electron laser (FEL) is on the order of unity and when the signal repeatedly passes through an optical cavity because of the nonlinear interaction between harmonics. The action of a FEL is studied for the case of a nonmonoenergetic electron beam.