 
Summary: Electric field induced hyperfine levelcrossings in (nD)Cs at
twostep laser excitation: Experiment and theory
M. Auzinsh *, K. Blushs, R. Ferber, F. Gahbauer, A. Jarmola, M. Tamanis
Department of Physics, University of Latvia, 19 Rainis Boulevard, LV1586 Riga, Latvia
Received 31 October 2005; accepted 13 January 2006
Abstract
The pure electric field levelcrossing of mF Zeeman sublevels of hyperfine F levels at twostep laser excitation is 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 ! 6P3/2 step and a
diode or dye laser for the second 6P3/2 ! nD3/2 step. Levelcrossing resonance signals are observed in the nD3/2 ! 6P1/2 fluorescence. A
theoretical model is presented 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 describe
well the experimental signals. The tensor polarizabilities a2 (in a3
0) are determined to be 7.45(20) · 104
for the 7D3/2 state and
1.183(35) · 106
for the 9D3/2 state; the electric field calibration is based on measurements of the 10D3/2 state, for which a2 is well estab
lished. The a2 value for the 7D3/2 state differs by ca. 15% from the existing experimentally measured value.
Ó 2006 Elsevier B.V. All rights reserved.
Keywords: Levelcrossing spectroscopy; Hyperfine manifold; Cesium; Twostep laser excitation; Polarizability
1. Introduction
