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Exploring Fresnel holography for optically guided atom interferomety with Bose-Einstein condensates

Victoria Henderson

Published Jan 1, 2018• 0 citations
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We report the achievement of an optically guided and quasi-monomode atom laser, in all spin projection states ( m F =-1, 0 and +1) of F =1 in rubidium 87. The atom laser source is a Bose-Einstein condensate (BEC) in a crossed dipole trap, purified to any one spin projection state by a spin-distillation process applied during the evaporation to BEC. The atom laser is outcoupled by an inhomogenous magnetic field, applied along the waveguide axis. The mean excitation number in the transverse modes is ⟨ n ⟩=0.65±0.05 for m F =0 and ⟨ n ⟩=0.8±0.3 for the low-field seeker m F =-1. Using a simple thermodynamical model, we infer from our data the population in each excited mode.
We present a guided atom laser. A Bose-Einstein condensate (BEC) is created in a crossed hybrid magnetic and an elongated optical trap, which acts as a matterwave guide. Atoms are extracted from the BEC by radio frequency (rf) outcoupling and then guided in the horizontal optical matterwave guide. This method allows to control the acceleration of the beam and to achieve large de Broglie wavelength. We also measure the longitudinal energy of the guided atom laser using atom optical elements based on a blue light barrier.