3bec1437   
   db156e84   
   From: siegman@stanford.edu   
      
   In article   
   <4ec8a9fe-7d60-458a-b25f-c136fb89be59@l30g2000vbn.googlegroups.com>,   
    alex  wrote:   
      
   > Am I correct in thinking that the far field intensity pattern is just   
   > the Fourier Transform of the intensity pattern at the source?  I have   
      
   No.  The far-field _E field_ pattern (amplitude and phase of the   
   far-field E field value) is the Fourier Transform of the near-field _E   
   field_ pattern (amplitude and phase of the near-field E field value) at   
   the source.   
      
   Then you square these to get instantaneous intensities at these two   
   planes.   
      
   Or better, work in "phasor" format (write E cos phi and E sin phi as   
   Ephasor exp(j phi) or -j Ephasor exp(j phi) respectively) and calculate   
   Ephasor * EphasorStar to get time averaged intensities.   
      
   Read up on "phasor analysis in Wikipedia or some online handbook.   
      
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