Doppler-free three-photon spectroscopy on narrow-line optical transitions

Guglielmo Panelli, Shaun C. Burd, Erik J. Porter +1

We demonstrate coherent Doppler-free three-photon excitation of the ${}^1{S}_0$$\leftrightarrow$${}^3{P}_0$ optical clock transition and the ${}^1{S}_0$$\leftrightarrow$${}^3{P}_1$…