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Ghost imaging in the spectral domain (Conference Presentation)
Author(s): Goëry Genty; Caroline Amiot; Piotr Ryczkowski; Ari T. Friberg; John M. Dudley
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Paper Abstract

Ghost imaging is an unconventional imaging technique that generates high resolution images by correlating the intensity of two light beams, neither of which independently contains useful information about the shape of the object. It has been shown that ghost imaging has great potential to provide robust imaging solutions in the presence of environmental perturbations. Originally demonstrated in the spatial domain with entangled photons, ghost imaging has been subsequently extended to the use of classical incoherent light sources. Significantly, the fundamental principle of ghost imaging is not restricted to producing spatial images, and in a recent time-domain application, measurement of ultrafast signals on picosecond timescales was reported. Here, exploiting recent progress in ultrafast real-time measurement techniques, we perform the first demonstration of ghost imaging in the spectral domain. Specifically, we show that, by correlating the spectral fluctuations of an incoherent supercontinuum light source measured in real-time using the dispersive Fourier transform with the total (integrated) signal detected after an object, one can obtain the spectral signature of this object. As a particular application, we report on the spectroscopic measurements of methane absorption lines in the near-infrared over a 50 nm bandwidth and with sub-nm resolution. The method is broadband, scan-free, has rapid acquisition time, and requires neither a high-power source nor particularly sensitive detectors. The results are in excellent agreement with independent direct measurements and offer novel perspectives for remote sensing in low light conditions, or in spectral regions where sensitive detectors are lacking.

Paper Details

Date Published: 4 March 2019
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Proc. SPIE 10903, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV, 109030C (4 March 2019); doi: 10.1117/12.2507972
Show Author Affiliations
Goëry Genty, Tampere Univ. of Technology (Finland)
Caroline Amiot, Tampere Univ. of Technology (Finland)
Piotr Ryczkowski, Tampere Univ. of Technology (Finland)
Ari T. Friberg, Univ. of Eastern Finland (France)
John M. Dudley, Univ. Bourgogne Franche-Comté (France)


Published in SPIE Proceedings Vol. 10903:
Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV
Daniel R. Solli; Georg Herink; Serge Bielawski, Editor(s)

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