From: rrllff@yahoo.com   
      
   On Wednesday, November 27, 2013 8:54:35 AM UTC-5, Gash M wrote:   
   > Hi all,   
   >    
   > I would like to write a routine (either in c or matlab) which can be used to   
   collapse a given conic or aspheric surface to Fresnel zones, which is   
   basically designing a Fresnel lens from a given lens entity(surface). Fresnel   
   Lens(FL) which has    
   prismatic facets is easy to implement.But in this case the facets have to be   
   conic(aspheric) and different ways of realizing the FL is possible like fixed   
   sag per zone and fixed zone spacing.That is the general goal. My problem is   
   breaking down this    
   problem into smaller pieces to make it easy for coding. Therefore, my question   
   is : what are the basic blocks that my code needs to have to construct a FL   
   from a given surface? A sample code would be appreciated.   
   >    
   > Thanks,   
   >    
   > Gash   
      
   I hope you do realize that collapsing a curved   
   surface to a flat Fresnel will result in different   
   aberrations.   
      
   http://www.richardfisher.com   
      
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