arXiv:2405.18109

Differential polarizability at 1064 nm of the strontium intercombination transition

Romaric Journet, F. Faisant, Sanghyeop Lee, Marc Cheneau

Published May 28, 2024• 0 citations

Abstract

We measure the scalar, vector and tensor components of the differential dynamic polarizability of the strontium intercombination transition at 1064 nm. We compare the experimental values with the theoretical prediction based on the most recently published spectroscopic data, and find a very good agreement. We also identify a close-to-circular `magic' polarization where the differential polarizability strictly vanishes, and precisely determine its ellipticity. Our work opens new perspectives for laser cooling optically trapped strontium atoms, and provides a new benchmark for atomic models in the near infrared spectral range.

DOI: 10.48550/arxiv.2405.18109

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arXiv:2405.18109

Differential polarizability at 1064 nm of the strontium intercombination transition

Romaric Journet, F. Faisant, Sanghyeop Lee, Marc Cheneau

Published May 28, 2024• 0 citations

arXiv HTML PDF

Abstract

DOI: 10.48550/arxiv.2405.18109

Related papers

Differential polarizability of the strontium intercombination transition at 1064.7 nm

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Physical Review ASep 23, 20241 citation

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arXiv:2011.06759Physical Review ADec 2, 20209 citations

^{88}\mathrm{Sr}

. Experimentally, we find 473.371(6) nm for $\mathrm{\ensuremath{\Delta}}m=0$ ($\ensuremath{\pi}$ transition) and 473.117(15) nm for $\mathrm{\ensuremath{\Delta}}m=\ensuremath{-}1$ (${\ensuremath{\sigma}}^{\ensuremath{-}}$ transition). Theoretical calculations yield 473.375(22) and 473.145(20) nm, respectively. Determining magic wavelengths nearby the dominant 461-nm probe transition of

^{88}\mathrm{Sr}

holds promise for state insensitive interfacing of strontium atoms and nanophotonic devices with a narrow band of operating wavelengths. Furthermore, the

^{3}{P}_{1}

polarizability is dominated by the contributions to the

5{p}^{2}\phantom{\rule{0.16em}{0ex}}^{3}P

levels, and excellent agreement of theory and experiment validates both theoretical values of these matrix elements and estimates of their uncertainties.

We characterize the anisotropic differential ac-Stark shift for the Dy

626\phantom{\rule{3.33333pt}{0ex}}\mathrm{nm}

intercombination transition, induced in a far-detuned

1070\phantom{\rule{3.33333pt}{0ex}}\mathrm{nm}

optical dipole trap, and observe the existence of a ``magic polarization'' for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, ${\ensuremath{\alpha}}_{E}^{\text{s}}=188(12){\ensuremath{\alpha}}_{\text{0}}$ and ${\ensuremath{\alpha}}_{E}^{\text{t}}=34(12){\ensuremath{\alpha}}_{\text{0}}$, respectively, where ${\ensuremath{\alpha}}_{\text{0}}$ is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasipure Bose-Einstein condensate of

^{162}\mathrm{Dy}

with $3\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms.

J'=J-1

intercombination line at 530.306 nm to determine the background scalar and vector polarizabilities of

^{162}

Dy in its ground state near this wavelength. Our measurements quantitatively agree with atomic-structure calculations and provide new insight into the contributions of nearby transitions in a spectral region relevant to emerging dysprosium tweezer platforms.

+

all-order method. The measurement is done with laser spectroscopy on cold atoms in an optical dipole trap. The magic wavelengths are determined to be 1035.68(4) nm for the $\ensuremath{\pi}$ transition $(\mathrm{\ensuremath{\Delta}}m=0)$ and 1036.12(3) nm for the $\ensuremath{\sigma}$ transitions $(|\mathrm{\ensuremath{\Delta}}m|=1)$ in agreement with the calculated values. Laser cooling on the narrow intercombination transition could achieve better results for atoms in an optical dipole trap when the trap wavelength is tuned to near the magic wavelength.