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28 September 2013 Determination of angular momentum content in partially coherent beams through cross correlation measurements
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Abstract
A means to measure orbital angular momentum in a partially coherent beam is demonstrated by using a wavefront folding interferometer. This interferometer allows us to study the cross correlation function of a partially coherent vortex beam. It is shown that the cross correlation function possesses ring dislocations which are related to the topological charge of the partially coherent vortex, exhibiting a one to one correspondence between the number of rings and the value of the topological charge, thus providing a direct measure of the orbital angular momentum.
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Adad Yepiz Escalante, Benjamin Perez-Garcia, Raul I. Hernandez-Aranda, and Grover A. Swartzlander Jr. "Determination of angular momentum content in partially coherent beams through cross correlation measurements", Proc. SPIE 8843, Laser Beam Shaping XIV, 884302 (28 September 2013); https://doi.org/10.1117/12.2024683
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