The results of previous work on the theory of holography with partially coherent light are applied to the measurement of spatial coherence by means of Fourier-transform holograms. It is shown that if a Fourier-transform hologram is made using a coherent reference beam, the amplitude at any point in the reconstructed image will be multiplied by the magnitude of the normalized degree of coherence between the reference beam and the light from the corresponding point on the object. Thus, the reconstructed image can be used to measure coherence. An example of such a measurement is discussed in detail. The usefulness of the partial-coherence approach in interpreting several known holographic phenomena is mentioned.
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