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10 April 1995Circular gratings encoding phase daisy variations
We present a circular grating that encodes phase variations in the form of a daisy flower, or a pie, with several slices, or petals, with equal central angle and every other slice having a delay of (lambda) /2. We suggest the use of this type of grating for optical alignment.
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Jorge Ojeda-Castaneda, Jose R. Flores, Juan Gutierrez Ibarra, "Circular gratings encoding phase daisy variations," Proc. SPIE 2398, Circular-Grating Light-Emitting Sources, (10 April 1995); https://doi.org/10.1117/12.206340