(1983). Effect of Interatomic Interactions on Resonance Fluorescence of Two Atoms Coherently Driven by a Strong Resonant Laser Field. Optica Acta: International Journal of Optics: Vol. 30, No. 6, pp. 713-731.
In this Comment we study the resonance fluorescence of a system of two atoms separated by an arbitrary distance R in an on-resonance laser field. The steady-state spectrum is calculated in the strong-field limit both for negligible and for non-negligible dipole-dipole interaction. The singlet state of the system is included throughout, even for small interatomic separations. We show that the so-called "scaling factor," or the enhancement of the integrated fluorescence by N atoms (above the expected factor of N), predicted in the literature by many authors, does not, in fact, exist.
Resonance-fluorescence power spectrum of two-level atoms driven by a strong monochromatic laser field is discussed, taking into account effects due to the dipole-dipole interaction between the atoms. For two atoms confined to a region smaller than the wavelength of the driving field, we predict significant deviations of the power spectrum from the single-atom case. The two-atom spectrum is nonsymmetric, the wing peaks are shifted from their Rabi-frequency positions, and additional maxima may appear.