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Abstract
We consider resonance properties of an assembly of N two-level atoms interacting with an intense photon beam. The atoms are assumed to be noninteracting with each other except via the action of the electromagnetic field. Using the phase representation of the radiation field and the boson description of the atom system we calculate the one-photon resonance frequency for two kinds of the system: a beam of atoms moving with uniform velocity and a Boltzmann atom gas. The resonance frequency shift is found to be dependent on the total number of atoms and the initial preparation of the atom system. Numerical results show that the collective shift is of the same magnitude as the Bloch-Siegert one.
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