Abstract
In isotropic random optical waves, each dark area may contain optical vortices or phase singularities. In this paper, we experimentally generate a speckle pattern and observe its transition along the propagation direction. Experimental results show that the vortex density changes along the propagation direction when the continuous phase part of the speckle field is removed with a spatial light modulator. The contrast ratio of the spackle field also changes due to the transition of the field. Such a transition can be interpreted to a certain extent by the self-annihilation of vortex dipoles due to the least-squares phase removal.
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