Scan-less hyperspectral dual-comb single-pixel-imaging in both amplitude and phase

摘要

We have developed a hyperspectral imaging scheme that involves a combinationof dual-comb spectroscopy and Hadamard-transform-based single-pixel imaging.The scheme enables us to obtain 12,000 hyperspectral images of amplitude andphase at a spatial resolution of 46 um without mechanical scanning. Thespectral resolution is 20 MHz, as determined by the linewidth of a single combmode, and the spectral interval is 100 MHz over a spectral range of 1.2 THzcentred at 191.5 THz. As an initial demonstration of our scheme, we obtainedspectroscopic images of a standard test chart through an etalon plate. Thethickness of an absorptive chromium-coated layer on a float-glass substrate wasdetermined to be 70 nm from the hyperspectral phase images in the near-infraredwavelength region.