Ultraviolet photon-counting dual-comb spectrometer (IMAGE)
Caption
An ultraviolet photon-counting dual-comb spectrometer. Two ultraviolet frequency combs of slightly different pulse repetition frequencies are generated at very low light levels by nonlinear frequency conversion of near-infrared combs. One ultraviolet comb passes through a sample. The two feeble combs are then superimposed with a beam splitter and detected by a photon-counting detector. At power levels more than one million times weaker than usually employed, the statistics of the detected photons carries the information about the sample with its possibly highly complex optical spectrum. (reproduced from https://doi.org/10.1038/s41586-024-07094-9)
Credit
Nathalie Picqué / Nature
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