Sensitive gravity-gradiometry with atom interferometry: progress towards an improved determination of the gravitational constant
arXiv:1002.3549 · doi:10.1088/1367-2630/12/9/095009
Abstract
We here present a high sensitivity gravity-gradiometer based on atom interferometry. In our apparatus, two clouds of laser-cooled rubidium atoms are launched in fountain configuration and interrogated by a Raman interferometry sequence to probe the gradient of gravity field. We recently implemented a high-flux atomic source and a newly designed Raman lasers system in the instrument set-up. We discuss the applications towards a precise determination of the Newtonian gravitational constant G. The long-term stability of the instrument and the signal-to-noise ratio demonstrated here open interesting perspectives for pushing the measurement precision below the 100 ppm level.
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- Sensitivity limits of a Raman atom interferometer as a gravity gradiometer
- Measurement of the Gravity-Field Curvature by Atom Interferometry
- Testing gravity with cold atom interferometry: Results and prospects
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- Single-beam Zeeman slower and magneto-optical trap using a nanofabricated grating
- Application of optical single-sideband laser in Raman atom interferometry
- Mapping the absolute magnetic field and evaluating the quadratic Zeeman effect induced systematic error in an atom interferometer gravimeter
- Extracting the differential phase in dual atom interferometers by modulating magnetic fields
- Scheme for suppressing atom expansion induced contrast loss in atom interferometers
- Measurement of the Speed of Gravity
- Gravitational sensing with weak value based optical sensors
- Tools for designing atom interferometers in a microgravity environment