Abstract
Abstract The power and wavelength of the output radiation and the final energy distribution of the electron beam of a free-electron-laser oscillator are calculated at the steady-state condition in which the gain per pass is set to be equal to the round-trip loss inside the cavity. The effect of the constant axial magnetic field on the output wavelength is also discussed, which suggests a practical way to achieve a fine tuning of the output frequency of a free-electron-laser oscillator. The Stanford experimental measurements of a free-electron oscillator at the steady state are used to test the theory and show good agreement.
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