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Photon-counting speckle imaging: the photon-counting hole in triple correlation

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Abstract

Triple-correlation analysis of astronomical speckle interferograms can overcome the image degradation caused by a turbulent atmosphere. The speckle interferograms of faint astronomical objects consist of only a few photoevents. The low time resolution of some types of detector explains why only one photoevent per pixel can be detected, even if two or more photoevents are arriving at the same pixel. These missing close photoevents in the speckle interferograms cause the photon-counting hole in the average autocorrelation and triple correlation. This defect must be removed for high-resolution imaging. We describe the theory of the photon-counting hole in triple-correlation imaging and show computer experiments demonstrating the feasibility of photon-counting hole compensation.

© 1993 Optical Society of America

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