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Proceedings Paper

Broadband RF imaging ans spectrum analysis using spatial-spectral hole burning in an inhomogeneously broadened absorber
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Paper Abstract

Broadband RF imaging by spatial Fourier beam-forming suffers from beam-squint. The compensation of this frequency dependent beam-steering requires true-time-delay multiple beam-forming or frequency-channelized beam-forming, substantially increasing system complexity. Real-time imaging using a wide bandwidth antenna array with a large number of elements is inevitably corrupted by beam-squint and is well beyond the capability of current or projected digital approaches. In this paper, we introduce a novel microwave imaging technique by use of the spectral selectivity of inhomogeneously broadened absorber (IBA) materials, which have tens of GHz bandwidth and sub-MHz spectral resolution, allowing real-time, high resolution, beam-squint compensated, broadband RF imaging. Our imager uses a self-calibrated optical Fourier processor for beam-forming, which allows rapid imaging without massive parallel digitization or RF receivers, and generates a squinted broadband image. We correct for the beam squint by capturing independent images at each resolvable spectral frequency in a cryogenically-cooled IBA crystal and then using a chirped laser to sequentially read out each spectral image with a synchronously scanned zoom lens to compensate for the frequency dependent magnification of beam squint. Preliminary experimental results for a 1-D broadband microwave imager are presented.

Paper Details

Date Published: 3 October 2005
PDF: 10 pages
Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597122 (3 October 2005); doi: 10.1117/12.629528
Show Author Affiliations
Youzhi Li, Univ. of Colorado at Boulder (United States)
Benjamin Braker, Univ. of Colorado at Boulder (United States)
Friso Schlottau, Univ. of Colorado at Boulder (United States)
Donghua Gu, Univ. of Colorado at Boulder (United States)
Max Colice, Univ. of Colorado at Boulder (United States)
Kelvin H. Wagner, Univ. of Colorado at Boulder (United States)


Published in SPIE Proceedings Vol. 5971:
Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics
Roberto A. Morandotti; Harry E. Ruda; Jianping Yao, Editor(s)

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