We describe an easily implementable method for non-destructive measurements of ultracold atomic clouds based on dark field imaging of spatially resolved Faraday rotation. The signal-to-noise ratio is analyzed theoretically and, in the absence of experimental imperfections, the sensitivity limit is found to be identical to other conventional dispersive imaging techniques. The dependence on laser detuning, atomic density, and temperature is characterized in a detailed comparison with theory. Due to low destructiveness, spatially resolved images of the same cloud can be acquired up to 2000 times. The technique is applied to avoid the effect of shot-to-shot fluctuations in atom number calibration, to demonstrate single-run vector magnetic field imaging and single-run spatial imaging of the system's dynamic behavior. This demonstrates that the method is a useful tool for the characterization of static and dynamically changing properties of ultracold atomic clouds.
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August 2013
Research Article|
August 21 2013
Non-destructive Faraday imaging of dynamically controlled ultracold atoms
Miroslav Gajdacz;
Miroslav Gajdacz
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Poul L. Pedersen;
Poul L. Pedersen
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Troels Mørch;
Troels Mørch
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Andrew J. Hilliard;
Andrew J. Hilliard
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Jan Arlt;
Jan Arlt
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Jacob F. Sherson
Jacob F. Sherson
a)
Danish National Research Foundation Center for Quantum Optics, Institut for Fysik og Astronomi,
Aarhus Universitet
, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Rev. Sci. Instrum. 84, 083105 (2013)
Article history
Received:
June 17 2013
Accepted:
August 01 2013
Citation
Miroslav Gajdacz, Poul L. Pedersen, Troels Mørch, Andrew J. Hilliard, Jan Arlt, Jacob F. Sherson; Non-destructive Faraday imaging of dynamically controlled ultracold atoms. Rev. Sci. Instrum. 1 August 2013; 84 (8): 083105. https://doi.org/10.1063/1.4818913
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