Investigation on the Cs 6S1=2 to 7D electric quadrupole transition via monochromatic two-photon process at 767 nm

Abstract

We experimentally demonstrate the cesium electric quadrupole transition from the 6S 1/2 ground state to the 7D 3/2,5/2 excited state through a virtual level by using a single laser at 767 nm. The excited state energy level population is characterized by varying the laser power, the temperature of the vapor, and the polarization combinations of the laser beams. The optimized experimental parameters are obtained for a high resolution transition interval identification. The magnetic dipole coupling constant A and electric quadrupole coupling constant B for the 7D 3/2,5/2 states are precisely determined by using the hyperfine levels intervals. The results, A = 7.39 (0.06) MHz, B = -0.19 (0.18) MHz for the 7D 3/2 state, and A = -1.79 (0.05) MHz, B =1.05 (0.29) MHz for the 7D 5/2 state, are in good agreement with the previous reported results. This work is beneficial for the determination of atomic structure information and parity non-conservation, which paves the way for the field of precision measurements and atomic physics.

Measuring the hyperfine splittings and deriving the hyperfine-interaction constants of Cesium 7D 5/2 excited state

“…According to the equations ( 4) and ( 5), the magneticdipole hyperfine-interaction constant A = -1.70(0.03) MHz and the electric-quadrupole hyperfine-interaction constant B = -0.77(0.58) MHz of the 7D 5/2 excited state can be calculated. The results are in good agreement with the previous reported results [27][28][29]34], as shown in Table 2. The experimental error mainly comes from the spectral resolution limitation caused by the wide linewidth of the obtained spectrum and the accuracy of the function generator, which driving the electro-optical phase modulator.…”

“…J. E. Stalnaker et al [28] measured the absolute transition frequency and the hyperfine-interaction constants of cesium 7D 5/2 states by using the frequency comb method in the two-photon excitation system. Recently, Sandan Wang [29] used a single laser with 767 nm to study the 6S 1/2 -7D 3/2,5/2 electric quadrupole transition in a thermal Cs vapor. The magnetic dipole coupling constant A and electric quadrupole coupling constant B for the 7D 3/2,5/2 states are precisely determined by using the hyperfine splitting intervals.…”