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Topological charge measurement of vortex beams by phase-shifting digital hologram technology

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Abstract

We propose a direct measurement method that is applicable to both integral and fractional vortex beams. In this approach, the phase distribution of the vortex beam is visualized via the phase-shifting digital holography technique. The least square method is initiatively employed to improve the measurement precision. The maximal error of the experimental results is below 4.8%.

© 2018 Optical Society of America

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