All-optical production of 7Li Bose-Einstein condensation using Feshbach resonances

Abstract

We show an all-optical method of making 7Li condensate using tunability of the scattering length in the proximity of a Feshbach resonance. We report the observation of two new Feshbach resonances on |F = 1;mF = 0> state. The narrow (broad) resonance of 7 G (34 G) width is detected at 831 +- 4 G (884 +4 -13 G). Position of the scattering length zero crossing between the resonances is found at 836 +- 4 G. The broad resonance is shown to be favorable for run away evaporation which we perform in a crossed-beam optical dipole trap. Starting directly form the phase space density of a magneto-optical trap we observe a Bose-Einstein condensation threshold in less than 3 s of forced evaporation.

5 pages, 5 figures

References in corpus (3)

• Feshbach resonances in ultracold K(39)
• All-optical generation and photoassociative probing of sodium Bose-Einstein condensates
• Molecular Bose-Einstein condensation in a versatile low power crossed dipole trap

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• Bound-state spectrum of an impurity in a quantum vortex
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• Hydrodynamic signatures and spectral properties of the quantum vortex
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