Abstract

The common plane-wave model predicts that distortions will occur in the asymptotic field when the plane-wave spectrum is band limited. These distortions result in anomalous intensity modulations in both the on-axis and off-axis regions. In the on-axis region, the predicted anomalies are negligible if and only if the product between the source diameter and the upper band limit of planar frequencies is large against one or if the upper band limit of planar frequencies is greater than the reciprocal wavelength. In the off-axis region, the predicted anomalies have a significant magnitude if and only if the product between source diameter and upper band limit of planar frequencies is of the order of one or less or if the upper band limit of planar frequencies is less than or equal to the reciprocal wavelength.

© 1982 Optical Society of America

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