title: Speckle contrast for superposed speckle patterns created by rotating the orientation of laser polarization.
abstract: For a rough diffuser that fully depolarizes a linearly polarized laser, the speckle contrast of a fully developed speckle image can be reduced from 1 to 0.5 by polarization diversity. This reduction is achieved by rotating an x-polarized laser to the y-polarized orientation to form four independent speckle patterns with equal intensities during the detector exposure time. For the case of arbitrary rotation of the polarization, we derived a generalized speckle contrast formula for the superposed speckle patterns. This formula completes the theory of speckle contrast for the sum of correlated speckle intensities as it relates to polarization diversity.
authors.affiliation: Department of Micro and Nano Systems Technology, Vestfold University College, Borre, Norway.
authors.forename: Zhaomin
authors.initials: Z
authors.lastname: Tong
authors.forename: Xuyuan
authors.initials: X
authors.lastname: Chen