Systematic study of Optical Feshbach Resonances in an ideal gas

Abstract

Using a narrow intercombination line in alkaline earth atoms to mitigate large inelastic losses, we explore the Optical Feshbach Resonance (OFR) effect in an ultracold gas of bosonic ${}^{88}$Sr. A systematic measurement of three resonances allows precise determinations of the OFR strength and scaling law, in agreement with coupled-channels theory. Resonant enhancement of the complex scattering length leads to thermalization mediated by elastic and inelastic collisions in an otherwise ideal gas. OFR could be used to control atomic interactions with high spatial and temporal resolution.

Significant changes to text and figure presentation to improve clarity. Extended supplementary material. 4 pages, 4 figures; includes supplementary material 8 pages, 4 figures. Submitted to Physical Review Letters

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• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Tuning the scattering length with an optically induced Feshbach resonance
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• Controlling a magnetic Feshbach resonance with laser light
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• Narrow Line Photoassociation in an Optical Lattice
• Two-photon photoassociative spectroscopy of ultracold 88-Sr
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