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Bandi Nagabhushan, Thejesh

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Bandi Nagabhushan, Thejesh
Affiliation principale
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Ancien.ne collaborateur.trice
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https://libra.unine.ch/handle/123456789/484

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  • Publication
    Accès libre
    Imaging microwave and DC magnetic fields in a vapor-cell Rb atomic clock
    (2015-11-6)
    Affolderbach, Christoph 
    ;
    Du, Guan-Xiang
    ;
    Bandi Nagabhushan, Thejesh 
    ;
    Horsley, Andrew
    ;
    Treutlein, Philipp
    ;
    Mileti, Gaetano 
    We report on the experimental measurement of the dc and microwave magnetic field distributions inside a recently developed compact magnetron-type microwave cavity mounted inside the physics package of a high-performance vapor-cell atomic frequency standard. Images of the microwave field distribution with sub-100-μm lateral spatial resolution are obtained by pulsed optical-microwave Rabi measurements, using the Rb atoms inside the cell as field probes and detecting with a CCD camera. Asymmetries observed in the microwave field images can be attributed to the precise practical realization of the cavity and the Rb vapor cell. Similar spatially resolved images of the dc magnetic field distribution are obtained by Ramsey-type measurements. The T2 relaxation time in the Rb vapor cell is found to be position dependent and correlates with the gradient of the dc magnetic field. The presented method is highly useful for experimental in situ characterization of dc magnetic fields and resonant microwave structures, for atomic clocks or other atom-based sensors and instrumentation.
  • Publication
    Métadonnées seulement
    High performance vapour-cell frequency standards
    (: Journal of Physics: Conference Series 723, 2015-10-27)
    Gharavipour, Mohammadreza 
    ;
    Affolderbach, Christoph 
    ;
    Kang, Songbai 
    ;
    Bandi Nagabhushan, Thejesh 
    ;
    Gruet, Florian 
    ;
    Pellaton, Matthieu 
    ;
    Mileti, Gaetano 
    We report our investigations on a compact high-performance rubidium (Rb) vapour-cell clock based on microwave-optical double-resonance (DR). These studies are done in both DR continuous-wave (CW) and Ramsey schemes using the same Physics Package (PP), with the same Rb vapour cell and a magnetron-type cavity with only 45 cm3 external volume. In the CW-DR scheme, we demonstrate a DR signal with a contrast of 26% and a linewidth of 334 Hz; in Ramsey-DR mode Ramsey signals with higher contrast up to 35% and a linewidth of 160 Hz have been demonstrated. Short-term stabilities of 1.4×10^-13 τ^-1/2 and 2.4×10^-13 τ^-1/2 are measured for CW-DR and Ramsey-DR schemes, respectively. In the Ramsey-DR operation, thanks to the separation of light and microwave interactions in time, the light-shift effect has been suppressed which allows improving the long-term clock stability as compared to CW-DR operation. Implementations in miniature atomic clocks are considered.