Dual-comb spectroscopy

The dual-comb approach (also called multiheterodyne approach) that is used in dual-comb spectroscopy1,2 allows for fast and precise scans over a broad frequency (or wavelength) range without any moving parts. While this technique can of course be used for spectroscopy3–5 it has by now found many more applications where it can replace scanning lasers and conventional broad-band light sources and optics. Examples are distance measurements (lidar)6 and rapid spatial scanning for imaging7,19. Here we will look into a few aspects of dual-comb schemes and why Kerr frequency combs are a very suitable light source.

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