Spatial correlations and photon counting

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Abstract
The effect of incomplete spatial coherence on photon correlation measurements is calculated in terms of the solutions to integral equations. The n time generating function is calculated with a new approach to the 'short counting time' approximation and the two-time generating function is calculated exactly for a Lorentz spectrum. The joint counting rates for a full digital correlator are obtained and approximate solutions to the 'clipped' correlator counting rate problem are indicated.