Reconstruction of longitudinal distributed incoherent sources
Abstract:
We describe measurement of the degree of coherence induced by a random light source distributed along the longitudinal z axis. If this degree of coherence is measured only between all the in-plane pairs of points placed along the radial lines it is proportional to the Fourier transform of the source’s three-dimensional intensity distribution as seen from the paraxial far zone. A reconstruction of the source shape from the measured degree of coherence is also demonstrated. © 1996 Optical Society of America Imaging by a very long-baseline interferometer1 can be explained by the relation between the far-field degree of coherence and the intensity distribution of the imaged object as formulated by the Van Cittert– Zernike theorem. Explicitly, it is manifested in this theorem that the two-point degree of coherence in the far field of a quasi-monochromatic, spatially incoherent light source is proportional to the Fourier transform of the source’s planar intensity distribution. This longterm theory was updated recently because new results
Citations
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