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Measuring high-order optical orbital angular momentum with a hyperbolic gradually changing period pure-phase grating

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Abstract

We present a method to measure the high-order orbital angular momentum (OAM) state of a light beam with a static hyperbolic gradually changing period pure-phase grating (HGCP-PPG). From the number and orientation of the fringes of the Hermite–Gaussian-like diffraction intensity pattern, the OAM state of the incident Laguerre–Gaussian beam can be measured. Experimental detection of the OAM state up to ±100-order has been achieved. This method is highly efficient and robust because the HGCP-PPG is adaptive to high-order OAM beam and tolerant of the misalignment of the incident OAM beam.

© 2018 Optical Society of America

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