Abstract
We propose an efficient method for characterizing the orbital angular momentum (OAM) of
an optical vortex with a large topological charge (TC) through distinguishing the interference
pattern of the non-uniformly-distributed multi-pinholes using fewer pinholes. This method overcomes
the limit on large TC detection by multi-point interferometer and can be used to probe optical
vortices with arbitrary sizes. In addition, it also has potential application in measuring light
beam with OAM from astronomical sources.
© 2012 Chinese Optics Letters
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