Hyperspectral image based on dual-frequency comb

A method for generating an illumination dual-comb signal that provides a train of interferograms readable by a regular video-rate camera comprising N pixels and having a sampling frequency of V Hz to extract hyperspectral information, the method comprising:

• providing a monochromatic signal;
• splitting the monochromatic signal in two split monochromatic signals;
• independently frequency shifting each of the two split monochromatic signals with an offset frequency below
• V
• 2
• ⁢
• Hz
• ;
• generating two frequency combs having a difference in repetition frequencies below
• V
• 2
• ⁢
• Hz
• by independent nonlinear modulation of the two split monochromatic signals;
• combining the two generated frequency comb signals to generate the illumination dual-comb signal;
• illuminating a target with the illumination dual-comb signal;
• employing a video-rate camera to read a train of interferograms based on one or both of a reflected and a transmitted signal of the illumination dual-comb signal at a frequency below
• V
• 2
• Hz;
• and
• performing Fourier transformation of the train of interferograms detected by each pixel from the N pixels to extract the hyperspectral information.