Abstract

I present an optical system for the polar formatting of data in a spotlight-mode synthetic aperture radar. This system is implemented with only one diffractive optical element (DOE). Previously such a DOE could not be produced because the phase of the required transmission function of the DOE does not obey the continuity condition, which is a prerequisite for the conventional implementation of such optical transforms. Here I show how a DOE can be produced to perform the complete polar-formatting transform by incorporating branch-point phase singularities in the transmission function of the DOE. The computation of the transmission function is shown, and numerically computed diffraction patterns obtained from this DOE are also shown.

© 1995 Optical Society of America

Holographic polar formatting and realtime optical processing of synthetic aperture radar data

Jack N. Cederquist, Michael T. Eismann, and Anthony M. Tai
Appl. Opt. 28(19) 4182-4189 (1989)

Branch-point diffractive optics

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Diffractive optical Hough transform implemented with phase singularities

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