Journal
OPTICS LETTERS
Volume 28, Issue 23, Pages 2285-2287Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.28.002285
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We demonstrate an experimental scheme that allows the elucidation of the orbital angular momentum discrete spectrum of an arbitrary light signal. The orbital angular momentum spectrum is represented in a Laguerre-Gaussian mode base, and the spectral components are resolved in the frequency domain by exploiting the Doppler frequency shift that is imparted to rotating light beams. (C) 2003 Optical Society of America.
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