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The analytical solution for the spectrum of resonance fluorescence from a collective system of two atoms is presented. It is shown that the spectrum is a decreasing function of frequency in the neighborhood co -coL --+20 (0 is the Rabi frequency) for moderately large 0 and exhibits resonant structure only for extremely large 0-100@. For moderately large 0 the resonant contributions at co -coL = +20 are destroyed by the nonresonant contributions; hence the additional structures at +20 can be resolved only by filtering the nonresonant contributions.Recently the structure of the spectrum of resonance fluorescence of a cooperative system of atoms has been studied in detail' ' and several different authors have reached different conclu-

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