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The coherence area is measured in a simple Young's experiment using parametric downconversion light produced in a nonlinear crystal (LiIO(3)) pumped by a continuous argon-ion laser. The normalized mutual intensity or degree of coherence is obtained from the intensity distribution interference patterns and compared with a standard theory in which the light source behaves as a surface with infinitesimal uncorrelated emitters.
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Ribeiro et al. (1994) studied this question.
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