Extended Data Fig. 8: Photon-counting dual-comb transmittance and phase spectra in the region the 5S1/2-5P3/2 of Rubidium.
From: Near-ultraviolet photon-counting dual-comb spectroscopy
The spectrum is sampled by the individual comb lines at a resolution of 100 MHz. The spectrum is measured at an average power of 3 × 10−12 W and the signal-to-noise ratio is limited by the quantum noise. For each isotope (85Rb or 87Rb), the resolved hyperfine splitting of the ground state 5S1/2 leads to two transitions per isotope.
