Measurements of complex OAM spectra. (IMAGE)

SPIE--International Society for Optics and Photonics

Measurements of complex OAM spectra.

Caption

Measurements of complex OAM spectra. Left: the measured intensity images of the signal and the interferogram; Right: the normalized amplitude and relative phase of the target and experimentally retrieved OAM spectrum. (a-d) Gaussian-shaped OAM spectra centered at 10-th order with versatile OAM mode spacings and relative phase relations. (a) In-phase OAM spectrum with a mode spacing of 1. (b) Linear-phase OAM spectrum with a phase slope of 2π/3 and a mode spacing of 1. (c) In-phase OAM spectrum with a mode spacing of 3. (d) OAM spectrum with periodic Talbot phase [0, 2π/3, 2π/3] and a mode spacing of 1. (e) Fractional OAM mode with a topological charge of 9.5. The retrieval accuracy is also indicated for each case.

Credit

Z. Lin, J. Hu, et al., doi 10.1117/1.AP.5.3.036006.

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