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10 January 2012, Volume 51, Issue 2, pp. 133-289
Slightly-off-axis dual-wavelength holograms with orthogonal spatial frequencies of a vortex phase plate. The spectral zero-order term is eliminated by the separated two-color holograms. The axial unambiguous measurement range is extended by synthesizing a beat wavelength. For details see the paper by Min et al., pp. 191-196.
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