Abstract

We study telecom-wavelength spectra of a Rydberg state in an atomic vapor with a three-photon excitation scheme. Two lasers of 780 nm and 776 nm are used to pump rubidium-85 atoms in a vapor cell to the 5D_5/2 state, from which a probe beam of 1292 nm in the O-band telecommunication wavelength drives a transition to the 21F_7/2 Rydberg state. We investigate the probe spectra over the power of pump lasers. The simulation based on a 4-level theoretical model captures the main features of the experimental results. This spectroscopic study paves the way for future experiments of making a direct link between fiber optics and radio transmission via Rydberg atoms.

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