Photon-counting dual-comb spectrometer (IMAGE)
Caption
Two mode-locked femtosecond laser beams of slightly different pulse repetition frequencies are superimposed with a beam splitter. One output is highly attenuated before passing through a sample and reaching a photon-counting detector. At power levels one billion times weaker than usually employed, the statistics of the detected photons carries the information about the sample with its possibly highly complex optical spectrum.
Credit
Nathalie Picqué
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