Abstract

The far-field properties of a plane source with a constant phase distribution are presented. It is found, for the first time to our knowledge, that for any plane source the theoretical upper limit of the far-field divergence angle is shown to be 65.5°. This result is different from what previous propagation and diffraction theories predicted, and when the size of the source approaches zero, the far-field behavior of the plane source is also different from a spherical wave in half-space.

© 1996 Optical Society of America

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