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arXiv:1609.02111 · Optics Express

Anisotropic dependence of tune-out wavelength near Dy 741-nm transition

Wil Kao, Yijun Tang, Nathaniel Burdick, Benjamin Lev

Published Feb 8, 2017• 39 citations
arXivHTMLPDF

Abstract

Dy measurement by the known isotope shifts.
DOI
10.1364/oe.25.003411

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We study the decay of a dense, ultracold sample of weakly bound DyK dimers stored in an optical dipole trap. Our bosonic dimers are composed of the fermionic isotopes Dy 161 and K 40 , which is of particular interest for experiments related to pairing and superfluidity in fermionic systems with mass imbalance. We have realized dipole traps with near-infrared laser light in four different wavelength regions between 1050 and 2002 nm . We have identified trap-light-induced processes as the overall dominant source of losses, except for wavelengths around 2000 nm , where light-induced losses appeared to be much weaker. In a trap near 1550 nm , we found a plateau of minimal light-induced losses, and by carefully tuning the wavelength we reached conditions where losses from inelastic collisions between the trapped dimers became observable. For very weakly bound dimers close to the center of a magnetically tuned Feshbach resonance, we demonstrate the Pauli suppression of collisional losses by about an order of magnitude.
Open-shell lanthanide atoms, and dysprosium in particular, combine a large ground-state angular momentum with dense electronic spectra, making their dynamical polarizability strongly dependent on wavelength and internal state, and therefore challenging to calculate and characterize experimentally. This issue has become especially relevant with the recent development of single-atom trapping of dysprosium in optical-tweezer arrays, where precise knowledge of the polarizability is needed to design optimized trapping architectures. Here, we exploit the strong spin-dependent light shift near the J′=J−1J'=J-1J′=J−1 intercombination line at 530.306 nm to determine the background scalar and vector polarizabilities of 162^{162}162Dy 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.