. . . . . Spectroscopy . Research update . Ultraviolet dual-comb spectroscopy system counts single photons . 13 Mar 2024 How it works: the top frequency comb is passed through a sample of interest and then into a beamsplitter. The bottom frequency comb operates at a slightly different pulse repetition frequency and is combined with the top comb in the beamsplitter. Photons in the combined beam are counted by a detector. (Court...