A method for rapid data acquisition in photon correlation experiments for time-dependent systems

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Abstract
It has been observed that it is possible to acquire significant correlation functions remarkably rapidly for large incident light intensities using heterodyne detection. This is shown to arise from baseline offset in the photomultiplier amplifier at high rates of photodetections. The first- and second-order statistical descriptions of the detector output pulses in this regime are unchanged from those for single-photon counting. In particular, correlation functions measured in the two regimes are indistinguishable. Potential advantages of such rapid acquisition are outlined.

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