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. 2022 Apr 14;13(4):614. doi: 10.3390/mi13040614

Figure 3.

Figure 3

Setup of a comb based FTS. (a) A frequency comb with a repetition rate frep interrogates a sample contained in an absorption cell, an enhancement cavity can be used to increase the effective absorption length. The light enters a Michelson interferometer where a measurement arm is translated over a scanning range Δmax to produce and interferogram, (b), that consists of several bursts spaced by c/frep. The Fourier transform of the interferogram yields the absorption spectra of the sample under test.

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