Abstract

We report Doppler-free spectroscopy of neutral europium carried out using the saturation absorption technique. In the present experiment, Eu/Ne hollow cathode discharge is used as an atomic vapor source of europium. The Eu transition 4f76s2(S87/2°)4f76s6p(P89/2) at 601.815 nm and 4f75d6s(aD1013/2°)4f75d6p(zD811/2) at 580.027 nm are investigated. The frequency separation between the adjacent hyperfine transitions as well as hyperfine structure (HFS) constants are calculated from the obtained experimental spectra. The HFS constant obtained for the state 4f76s6p(P89/2) are A151=664.8MHz; B151=293.5MHz, and for state 4f75d6p(zD811/2), the values are A151=7.6MHz; B151=60MHz. These obtained values are in good agreement with the results reported in the literature using laser induced atomic beam fluorescence technique.

© 2017 Optical Society of America

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