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Proceedings Article

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

[+] Author Affiliations
Youzhi Li, Benjamin Braker, Friso Schlottau, Donghua Gu, Max Colice, Kelvin H. Wagner

Univ. of Colorado at Boulder

Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597122 (October 03, 2005); doi:10.1117/12.629528
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From Conference Volume 5971

  • Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics
  • Roberto A. Morandotti; Harry E. Ruda; Jianping Yao
  • Toronto, Canada | September 12, 2005

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.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Youzhi Li ; Benjamin Braker ; Friso Schlottau ; Donghua Gu ; Max Colice, et al.
"Broadband RF imaging and spectrum analysis using spatial-spectral hole-burning in an inhomogeneously broadened absorber", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597122 (October 03, 2005); doi:10.1117/12.629528; http://dx.doi.org/10.1117/12.629528


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