Hi,   
      
   I try to filter out the laser beam through a spatial filter. I made a few   
   attempts. Every time I obtained a picture resembling Airy disk.   
   I have question connected with the output picture from the filter.   
   What picture should I get exactly at the output ?   
   Airego disk or image resembling the clean gaussian beam (without external   
   satellites)?   
   In my opinion satellites are always then when there is a diffraction.   
   Because the input beam always (theoretically) extends to the infinity, at the   
   output I will have always diffraction pattern (with satelites).   
   The satellites will have a different intensity, depending on the chosen filter   
   parameters.   
      
   Is this correct reasoning?   
   Thanks in advance,   
   Andriej   
      
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