Measurement of dynamic Stark polarizabilities by analyzing spectral line shapes of forbidden transitions

Abstract

We present a measurement of the dynamic scalar and tensor polarizabilities of the excited state |5d6s 3 D 1 in atomic ytterbium. The polarizabilities were measured by analyzing the spectral lineshape of the 408-nm 6s 2 1 S 0 → 5d6s 3 D 1 transition driven by a standing wave of resonant light in the presence of static electric and magnetic fields. Due to the interaction of atoms with the standing wave, the lineshape has a characteristic polarizability-dependent distortion. A theoretical model was used to simulate the lineshape and determine a combination of the polarizabilities of the ground and excited states by fitting the model to experimental data. This combination was measured with a 13% uncertainty, only 3% of which was due to uncertainty in the simulation and fitting procedure. By comparing two different combinations of polarizabilities, the scalar and tensor polarizabilities of the state |5d6s 3 D 1 were measured to be α 0 ( 3 D 1 ) = 0.009(21) Hz(V/cm) −2 and α 2 ( 3 D 1 ) = −0.103(26) Hz(V/cm) −2 , respectively. We show that this technique can be applied to similar atomic systems.

Towards improved measurements of parity violation in atomic ytterbium

“…The 80 G magnetic field applied to the atoms splits the transition into its three Zeeman components. The observed lineshape asymmetry arises in the presence of the intense standing-wave field of the PBC, due to the off-resonance ac-Stark shift [18,19].…”

“…The finesse of the PBC was measured to be ≈500. Since at the high intra-cavity power level required for the PV experiments there is a distortion in the lineshape of the 408 nm transition (occurring due to the effects of an off-resonant ac-Stark shift, and studied extensively in [18,19]), the choice of r.o.c. for the PBC mirrors was a compromise between the need for a cavity waist which is as large as possible and ease of alignment for the light coupled to the TEM 00 mode of the PBC.…”

Dynamic dipole polarizability of Li+ embedded in plasmas

“…Recently, Kar and co-workers have reported the dynamic dipole polarizabilities of He, H − , Ps − in weakly coupled plasma environments [10,20]. Experimental information on the dynamic polarizability of atomic system in vacuum is also available in the literature [21].…”

Investigation of ac Stark shifts in excited states of dysprosium relevant to testing fundamental symmetries

“…contains the dependence of the resonant differential polarizability on the electric field frequency, ν [29,31,32]. The quantity Γ BA /(2π) is determined by the radiative lifetimes of states A and B as well as transit effects; in our setup it is empirically determined to be ≈ 45 kHz.…”

“…Note that a bold α will refer to polarizabilities and should not be confused with the fundamental constant α. The polarizability of an atomic state |m can be written in the form [28][29][30] …”