Non-destructive shadowgraph imaging of ultra-cold atoms

Wigley, P. B.; Everitt, P. J.; Hardman, Kyle; Hush, Michael; Wei, Chunhua; Sooriyabandara, M. A.; Manju, P.; Close, John; Robins, Nicholas; Kuhn, Carlos C. N.

doi:10.1364/ol.41.004795

Cited by 33 publications

(37 citation statements)

References 34 publications

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“…Firstly, a horizontal absorption beam allows the cloud to be imaged after 20ms of ballistic expansion (a s = 0) in free space to calibrate absolute atom number. A second vertical, far-detuned imaging beam utilizes nondestructive shadowgraph imaging to take in situ images of the condensate [12]. Up to 100 images can be taken in a single run as little as 0.4ms apart with no measurable change in atom number.…”

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confidence: 99%

Observation of a modulational instability in Bose-Einstein condensates

et al. 2017

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We observe the breakup dynamics of an elongated cloud of condensed 85 Rb atoms placed in an optical waveguide. The number of localized spatial components observed in the breakup is compared with the number of solitons predicted by a plane-wave stability analysis of the nonpolynomial nonlinear Schrödinger equation, an effective one-dimensional approximation of the Gross-Pitaevskii equation for cigar-shaped condensates. It is shown that the numbers predicted from the fastest growing sidebands are consistent with the experimental data, suggesting that modulational instability is the key underlying physical mechanism driving the breakup.

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confidence: 99%

Observation of a modulational instability in Bose-Einstein condensates

et al. 2017

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“…However, during the process the atoms are released from the confining potential and undergo a strong resonant interaction with the probe laser light, which heats up and destroys the sample. This allows for acquisition of just one data point per experimental run, and has motivated the development of probing methods using off-resonant light to reduce the spontaneous scattering of photons away from the probe beam, such as dispersive dark-ground imaging [5], phase contrast imaging [6,7], and Faraday imaging [8][9][10].…”

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confidence: 99%

Dispersive optical detection of magnetic Feshbach resonances in ultracold gases

et al. 2017

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Magnetically tunable Feshbach resonances in ultracold atomic systems are chiefly identified and characterized through time-consuming atom loss spectroscopy. We describe an off-resonant dispersive optical probing technique to rapidly locate Feshbach resonances and demonstrate the method by locating four resonances of 87Rb, between the |F = 1,mF = 1〉 and |F = 2,mF = 0〉 states. Despite the loss features being ≲0.1 G wide, we require only 21 experimental runs to explore a magnetic field range >18 G, where 1G = 10−4 T. The resonances consist of two known s-wave features in the vicinity of 9 G and 18 G and two previously unreported p-wave features near 5G and 10 G. We further utilize the dispersive approach to directly characterize the two-body loss dynamics for each Feshbach resonance.

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“…The theoretical system is modelled according to experimentally-realizable parameters [30][31][32], briefly described below. A BEC of 10 5 85 Rb atoms is initially prepared in a cylindrically-symmetric harmonic trapping potential with radial and axial trapping frequencies ω ⊥ = 2π × 70 Hz and ω z = 2π × 10 Hz, respectively.…”

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confidence: 99%

Quantum tunneling dynamics of an interacting Bose-Einstein condensate through a Gaussian barrier

et al. 2018

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The transmission of an interacting Bose-Einstein condensate incident on a repulsive Gaussian barrier is investigated through numerical simulation. The dynamics associated with interatomic interactions are studied across a broad parameter range not previously explored. Effective 1D Gross-Pitaevskii equation (GPE) simulations are compared to classical Boltzmann-Vlasov equation (BVE) simulations in order to isolate purely coherent matterwave effects. Quantum tunneling is then defined as the portion of the GPE transmission not described by the classical BVE. An exponential dependence of transmission on barrier height is observed in the classical simulation, suggesting that observing such an exponential dependence is not a sufficient condition for quantum tunneling. Furthermore, the transmission is found to be predominately described by classical effects, although interatomic interactions are shown to modify the magnitude of the quantum tunneling. Interactions are also seen to affect the amount of classical transmission, producing transmission in regions where the non-interacting equivalent has none. This theoretical investigation clarifies the contribution quantum tunneling makes to overall transmission in many-particle interacting systems, potentially informing future tunneling experiments with ultracold atoms. arXiv:1808.07196v2 [quant-ph]

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Non-destructive shadowgraph imaging of ultra-cold atoms

Cited by 33 publications

References 34 publications

Observation of a modulational instability in Bose-Einstein condensates

Observation of a modulational instability in Bose-Einstein condensates

Dispersive optical detection of magnetic Feshbach resonances in ultracold gases

Quantum tunneling dynamics of an interacting Bose-Einstein condensate through a Gaussian barrier

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