Measurement of hyperfine coupling constants of the5d2Djlevels in Cs using polarization quantum-beat spectroscopy

Abstract

A precise measurement of the $5d{}^2{D}_j$ $(j=\frac{3}{2},\frac{5}{2})$ hyperfine structure in atomic Cs is reported. A pump and delayed-probe method based on quantum-beat spectroscopy has been used, whereby the linear polarization degree of the probe signal is determined as a function of probe delay. From the measured polarization beat frequencies for delays up to about 180 ns, the magnetic-dipole and electric-quadrupole coupling constants $A$ and $B$ for the two levels are obtained: $A=-21.24\left(5\right)\mathrm{}\mathrm{MHz}$ and $B=0.2\mathrm{}\left(5\right)\mathrm{}\mathrm{MHz}$ for the $5d{}^2{D}_{5/2}$ level and $A=48.78\mathrm{}\left(7\right)\mathrm{}\mathrm{MHz}$ and $B=0.1\mathrm{}\left(7\right)\mathrm{}\mathrm{MHz}$ for the $5d{}^2{D}_{3/2}$ level.