Coherent electromagnetic field imaging through Fourier transform heterodyne Page: 4 of 25
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COHERENT ELECTROMAGNETIC FIELD IMAGING
THROUGH FOURIER TRANSFORM HETERODYNE
Bradly J. Cooke, Amy E. Galbraitht, Bryan E. Laubscher, Nicholas L. Olivas, Roy M. Goeller,
Andrew C. Grublerl, Maureen Cafferty, and Scott D. Briles
Los Alamos National Laboratdry
P.O. Box 1663, MS-D448
Los Alamos, NM 87545
Abstract: We present a detection process capable of directly imaging the transverse
amplitude, phase, and if desired, Doppler shift of coherent electromagnetic fields. Based on
coherent detection principles governing conventional heterodyned RADAR/LIDAR systems,
Fourier Transform Heterodyne (FTH) incorporates transverse spatial encoding of the local
oscillator for image capture. Appropriate selection of spatial encoding functions, or basis set,
allows image retrieval by way of classic Fourier manipulations. Of practical interest:
(i) imaging is accomplished on a single element detector requiring no additional scanning or
moving components, and (ii) a wide variety of appropriate spatial encoding functions exist that
may be adaptively configured in real-time for applications requiring optimal detection. In this
paper, we introduce the underlying principles governing FTH imaging, followed by
demonstration of concept via a simple experimental setup based on a HeNe laser and a 69
element spatial phase modulator.
Key words: coherent electromagnetic field imaging, imaging RADAR/LIDAR, adaptive imaging
The ability to image both amplitude and phase of mm-RF through optical coherent
electromagnetic fields enables interesting adaptations of current RADAR/LIDAR and
communications technology & applications. Field imaging permits the correction of phase-front
distortion imposed by target, atmosphere, and receiver optics. A coherent receiver capable of
adaptively tracking and correcting atmospheric induced phase-front error allows the realization of
large aperture, long-range communication systems.' Real-time adaptive processing algorithms,
prompted by direct transverse field encoding, might be put to use in the realization of novel
RADAR/LIDAR systems queuing on a specific target(s) shape, size, velocity and trajectory.
t Electrical and Computer Engineering Department, University of Arizona
I United States Naval Academy, P.O. Box 12939, Annapolis, MD 21412
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Cooke, B. J.; Laubscher, B. E.; Olivas, N. L.; Goeller, R. M.; Cafferty, M.; Briles, S. D. et al. Coherent electromagnetic field imaging through Fourier transform heterodyne, report, December 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc674534/m1/4/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.