Abstract
The problem of the intrinsic linewidth of a free-electron laser is analyzed. As opposed to the traditional Schawlow-Townes linewidth in atomic lasers, which is a quantum-mechanical result, the free-electron-laser linewidth is classical, that is, independent of \ensuremath{\Elzxh}. The theory of the ultimate linewidth of a free-electron laser is developed here, using the master Fokker-Planck approach with the advantage, over previous work, that it does not make use of any ansatz.
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