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Measuring OAM states of light beams with gradually-changing-period gratings

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Abstract

A method to measure orbital angular momentum (OAM) states of light beams by using gradually-changing-period gratings is reported. Two kinds of gradually-changing-period gratings were used for the measurement of OAM states. The OAM states of the incident beam can be measured easily from the Hermite–Gaussian-like diffraction patterns. The simulation results agree well with the experiments.

© 2015 Optical Society of America

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