Fig. 2: Spectral encoding of the dual-comb system and the mode-resolved spectrum from single-photon DC-GIS. | Nature Communications

Fig. 2: Spectral encoding of the dual-comb system and the mode-resolved spectrum from single-photon DC-GIS.

From: Single-photon dual-comb ghost imaging spectroscopy

Fig. 2

a Encoding matrix used for DC-GIS. b Dual-comb matrix after encoding by the matrix from a. c First dual-comb mode-resolved pattern. d Zoom-in the single comb with 12.5 kHz linewidth from c. e Fourteen dual-comb mode-resolved pattern; grey lines are “missing” teeth encoded with “0”. f Zoom-in spectrum of the comb encoded with “0” from e, the extinction ratio is better than −20 dB. g Photon-counting signal with a measurement duration of 1.92 seconds, and the counting time for each data point is 15 ms. h Mode-resolved spectrum reconstructed by ghost imaging based on the photon-counting signal from g; the blue line represents the simulated absorption lines from HITRAN database; the inset is the background spectrum without the sample. The optical frequency \({f}_{{{\rm{c}}}}\) is 196.484 THz in these figures.

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