Electric field induced hyperfine level-crossings in (nD)Cs at two-step laser excitation: experiment and theory
Abstract
The pure electric field level-crossing of mF Zeeman sublevels of hyperfine F levels at two-step laser excitation was described theoretically and studied experimentally for the nD3/2 states in Cs with n = 7,9, and 10, by applying a diode laser in the first 6S1/2 to 6P3/2 step and a diode or dye laser for the second 6P3/2 to nD3/2 step. Level-crossing resonance signals were observed in the nD3/2 to 6P1/2 fluorescence. A theoretical model was developed to describe quantitatively the resonance signals by correlation analysis of the optical Bloch equations in the case when an atom simultaneously interacts with two laser fields in the presence of an external dc electric field. The simulations described well the experimental signals. The tensor polarizabilities (in Bohr radii cubed) were determined to be 7.45(20) x 104 for the 7D3/2 state and 1.183(35) x 106 for the 9D3/2 state; a well established tensor polarizability value for 10D3/2 was used to calibrate the electric field. The tensor polarizability value for the 7D3/2 state differed by ca. 15% from the existing experimentally measured value.
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