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We point out that the expression of the cross-spectral density (CSD) of a partially coherent flat-topped beam (PCFB) given by Ge et al. [Appl. Opt. 43, 4732 (2004)] is incorrect. The results show that the factor derived based on Ge's expression leads to in some cases, which is physically unacceptable. A new expression of the CSD for a PCFB is given.
© 2006 Optical Society of America
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