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Bulletin of the American Physical Society

Photoassociation Rate of a $^{7}$Li Bose-Einstein Condensate near a Feshbach Resonance

Mark D. Junker, D. Dries, Y.P. Chen, C. Welford, J. M. Hitchcock, Randall G. Hulet

Published Jun 7, 2007• 0 citations
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Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance

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We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold 7Li. The photoassociation-induced loss-rate coefficient K_{p} depends strongly on magnetic field, varying by more than a factor of 10;{4} for fields near the FR. At sufficiently high laser intensities, K_{p} for a thermal gas decreases with increasing intensity, while saturation is observed for the first time in a Bose-Einstein condensate. The frequency shift is also strongly field dependent and exhibits an anomalous blueshift for fields just below the FR.

arXiv:0803.1167•Physical Review Letters•Aug 8, 2008•90 citations
Photoassociation Rate of a 7^{7}7Li Bose-Einstein Condensate near a Feshbach Resonance
We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold 7Li. The photoassociation-induced loss-rate coefficient K_{p} depends strongly on magnetic field, varying by more than a factor of 10;{4} for fields near the FR. At sufficiently high laser intensities, K_{p} for a thermal gas decreases with increasing intensity, while saturation is observed for the first time in a Bose-Einstein condensate. The frequency shift is also strongly field dependent and exhibits an anomalous blueshift for fields just below the FR.