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Far-Field Diffraction by Various Sector Apertures

Equations are derived for computing the form of the aberration-free far-field diffraction patterns by various sector apertures. These equations have been used to compute the log-irradiance distribution in the focal plane and the three-dimensional irradiance distribution in meridional planes of a far-field diffraction pattern. The results are discussed and shown graphically. Some experiments were conducted to verify the results of irradiance distribution in the focal plane.