FresnelNumber:

Path: Imaging/Optics

% Compute the Fresnel Number.
 This represents the number of Fresnel's half wave zones in the pupil.

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   Form:
   N = FresnelNumber( a, lambda, R )
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   Inputs
   ------
   a           (1,1)   Aperture (mm)
   lambda      (1,1)   Wavelength (nm) 
   R           (1,1)   Distance from aperture to Gaussian image plane (mm)

   -------
   Outputs
   -------
   N           (1,1)   Fresnel Number

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   Reference:  Virendra N. Mahajan, "Beam Focusing and Depth of Focus,"
               The Aerospace Corporation.
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