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15 October 2004 Squint compensation for a broadband RF array spectral imager using spatial spectral holography
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Abstract
We present a proof-of-concept optical experiment that demonstrates the ability to record squinted broadband RF images formed by a Fourier beamforming phased-array antenna and subsequent squint correction using spatial spectral holography. A cryogenically cooled inhomogeneously broadened absorber (Tm3+:YAG) acts as a spectrally selective holographic medium which records the squinted RF image, covering a wide RF bandwidth (approaching 20 GHz) with resolution of approximately 1 MHz. Subsequently, a frequency-swept laser can read out the squinted image while a magnification-compensating motorized zoom lens synchronously corrects the magnification due to beam squint. Time-integration the image on a CCD detector array produces a squint-compensated broadband RF image, while detection with a MHz bandwidth detector can produce spectral estimates for all sources recorded with this imaging system.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Friso Schlottau, Benjamin Braker, and Kelvin Wagner "Squint compensation for a broadband RF array spectral imager using spatial spectral holography", Proc. SPIE 5546, Imaging Spectrometry X, (15 October 2004); https://doi.org/10.1117/12.559689
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