In this paper, we report an experiment, which demonstrates computation of topological charges of two optical vortices via a nondegenerate four-wave-mixing process. We show that the output signal photon carries orbital angular momentum which equals to the subtraction of the orbital angular momenta of the probe light photon and the backward pump light photon. The ⁸⁵Rb atoms are used as the nonlinear medium, which transfers the orbital angular momenta of lights.
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Jiang et al. (2006) studied this question.
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