The Sagnac effect, manifest in the phase shift of a rotating interferometer proportional to its physical area and to the rotation rate of the frame, plays a crucial role in modern physics being generalized to any kind of interferometer. However, as compared to light, the accurate experimental validation of the Sagnac effect for matter-waves remains challenging. We report the accurate measurement of the Sagnac phase shift, induced by the Earth’s rotation, using a large-area cold atom interferometer. We probe the atomic Sagnac phase shift along the two orthogonal horizontal axes in various orientation of the sensor with respect to geographic north and obtain an agreement with the theoretical prediction at the 20 ppm level, improving by twenty five-fold over the previous achievements for matter waves. Our results underline the universality of the Sagnac effect and open new horizons for testing other fundamental theories, as well as for a number of technological applications in seismology, geodesy and inertial navigation systems.
This presentation will review some of the latest state-of-the-art developments in cold-atom inertial sensors developped at the SYRTE laboratory in Paris.
Sergei Zibrov, Leonid Sidorenkov, Peter Siushev, Vitaliy Vasil'ev, Vladimir Velichansky, Denis Brazhnikov, Alexey Taichenachev, Anatoliy Tumaikin, Valeriy Yudin
The resonance of saturated absorption in counterpropagating light fields is experimentally and theoretically studied. We
focus on a case of parallel and linearly polarized waves, driving an open dipole transition in rubidium vapor. A new
Doppler-free resonance within the saturated-absorption dip is revealed. The phenomenon can be gained only in
absorption of strong wave in presence of weak one. The effect can not be explained basing on the previously known
reasons. The results obtained can be found useful in metrology for the frequency and time standards.
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