Aperture Shaping - A Technique For The Control Of The Spatial Distribution Of Diffracted Energy

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Abstract
The basic philosophy for the selection of aperture configurations, referred to as aperture shaping, for the azimuthal manipulation of the diffracted energy is formulated. Aperture shaping is implemented through the modification of the entrance aperture by the introduction of opaque obstructions of various forms. The basic "building blocks" for the construction of the aperture consist of triangles, rectangles, and annular rings. An analytical expression is derived for the point spread function with the limitations of Fraunhofer diffraction. Computer software has been developed and is operational for the detailed analysis of any aperture that may be so constructed. Three types of aperture configurations pertinent to the stray light rejection problem are examined. (1) An orthogonal supporting spider, (2) a venetian type baffle, and (3) a ring shaped baffle.

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