Abstract

A different kind of intensity correlation, denoted as polarization-based intensity correlation (PBIC), is proposed and demonstrated to investigate the correlation between different polarizations of a depolarized speckle pattern (DSP), which has non-uniform spatial polarization distribution. It is shown both theoretically and experimentally that the range of the PBIC for any polarization of the DSP depends on the spatial average intensity of the speckles corresponding to that particular polarization. The experimentally determined nature of the change of the range of the PBIC for different polarization components, due to the variation in the average intensity, is found to be matching well with the theoretical prediction. The existence of non-zero correlation between two orthogonally polarized speckle patterns, filtered from a partially DSP, is also observed. This study may be useful in exploiting the PBIC for different applications such as speckle cryptography.

© 2021 Optical Society of America

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