A simple, narrow, and robust atomic frequency reference at 993 nm exploiting the rubidium (Rb) $5S_{1/2}$ to $6S_{1/2}$ transition using one-color two-photon excitation

Thomas Nieddu, Tridib Ray, Krishnapriya S. Rajasree +2

We experimentally demonstrate a one-color two-photon transition from the $5S_{1/2}$ ground state to the $6S_{1/2}$ excited state in rubidium (Rb) vapor using a co…