From: je2ccc@gmail.com   
      
   I understand what you mean. But the quasi-monochromatic optic fields   
   can be achieved. So it has a realistic meaning in such occasions.   
      
   On Mon, 11 Nov 2013 11:25:19 -0500, Phil Hobbs   
    wrote:   
   >Haven't read the paper, but the thin-object approximation is unphysical   
   >anyway.  We want the phase and amplitude to be a function only of   
   >position...   
      
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