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13 Fresnel Diffraction - University of Arizona

structed irradiance. Thus, the irradiance produced by the first Fresnel zone is equal to 4 times the irradiance obtained with a clear aperture. As the equation shows, for odd numbers of Fresnel zones present i@ PD = 4ioo@ PD (6) For even numbers of Fresnel zones present the Fresnel zones cancel one another and the on-axis irradiance is zero.

  Irradiance, Diffraction, Fresnel, 13 fresnel diffraction