Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line

TL;DR

This study measures the anisotropic dynamical polarizability of dysprosium atoms near 626 nm using modulation spectroscopy, providing precise data and demonstrating optical trapping, which enhances control over Dy atom manipulation.

Contribution

The paper introduces a method to accurately measure Dy's polarizability near a resonance, independent of field sign, and demonstrates optical trapping on the intercombination line.

Findings

Polarizability measurements agree with literature values.

Optical trapping on the intercombination line confirmed long lifetimes.

Method allows species-specific manipulation of Dy atoms.

Abstract

We report on measurements of the anisotropic dynamical polarizability of Dy near the 626-nm intercombination line, employing modulation spectroscopy in a one-dimensional optical lattice. To eliminate large systematic uncertainties resulting from the limited knowledge of the spatial intensity distribution, we use K as a reference species with accurately known polarizability. This method can be applied independently of the sign of the polarizability, i.e., for both attractive and repulsive optical fields on both sides of a resonance. By variation of the laser polarization we extract the scalar and the tensorial part. To characterize the strength of the transition, we also derive the natural linewidth. We find our result to be in excellent agreement with literature values, which provide a sensitive benchmark for the accuracy of our method. In addition we demonstrate optical dipole trapping on the intercombination line, confirming the expected long lifetimes and low heating rates. This provides an additional tool to tailor optical potentials for Dy atoms and for the species-specific manipulation of atoms in the Dy-K mixture.