Direct frequency-comb spectroscopy of 6s(2)S(1/2)-8s(2)S(1/2) transitions of atomic cesium

Abstract

Direct frequency-comb spectroscopy is used to probe the absolute frequencies of the 6s2S(1/2)-8s2S(1/2) two-photon transitions of atomic cesium in a hot vapor environment. By utilizing the coherent control method of temporally splitting the laser spectrum above and below the two-photon resonance frequency, Doppler-free absorption is built in two spatially distinct locations and imaged for high-precision spectroscopy. Theoretical analysis finds that these transition lines are measured with uncertainty below 5 x 10(-10), mainly contributed from laser-induced AC Stark shift.