Intensity correlation of the resonance fluorescence radiation from an atom driven by a laser pump with amplitude and phase fluctuations

The influence of the phase and amplitude fluctuations of a relatively weak laser pump on the intensity correlations of the resonance fluorescence light from a single atom is studied. It is found that the contributions due to a non-Markovian dephasing of the laser light can be neglected in many cases. The amplitude fluctuations and the attendant non-factorizability of the intensity correlation function are shown to lead to a stronger correlation of the intensities of the resonance fluorescence light considered.