Measurement of dynamic Stark polarizabilities by analyzing spectral lineshapes of forbidden transitions

TL;DR

This paper introduces a novel spectroscopic method to measure the dynamic polarizabilities of excited atomic states by analyzing spectral lineshapes influenced by standing wave fields and external static fields.

Contribution

The study presents the first measurement of the scalar and tensor polarizabilities of the 3D1 state in ytterbium using lineshape analysis, with a theoretical model fitting experimental data.

Findings

Measured polarizabilities with 13% uncertainty

Demonstrated the technique's applicability to similar atomic systems

First-time measurement of the 3D1 state's polarizabilities

Abstract

We present a measurement of the dynamic scalar and tensor polarizabilities of the excited state 3D1 in atomic ytterbium. The polarizabilities were measured by analyzing the spectral lineshape of the 408-nm 1S0->3D1 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 is due to uncertainty in the simulation and fitting procedure. The scalar and tensor polarizabilities of the state 3D1 were measured for the first time by comparing two different combinations of polarizabilities. We show that this technique can be applied to similar atomic systems.