The nonparaxial wave obtained by Seshadri
[Appl. Opt. 45, 5335
(2006)] is correct. The
difference in the input field distributions of the nonparaxial wave and the
corresponding paraxial beam is correct and is not caused by any error in the
treatment. As is to be expected, in the appropriate limit, the nonparaxial wave
reduces to the paraxial beam for including the secondary source plane and for .
© 2008 Optical Society of America
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