Geometrical-transformation approach to optical two-dimensional beam shaping: comment.
I show that the research reported by Arieli et al. [Appl. Opt. 36, 9129 (1997)] has two serious mistakes: One is that an important factor is lost in the formula used in that study to determine the x-direction coordinate transformation; the other is the conclusion that the geometrical-transformation approach given by Arieli et al. can provide a smooth phase distribution. A potential research direction for obtaining a smooth phase distribution for a generic two-dimensional beam-shaping problem is stated.
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