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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Cold atom sagnac interferometer (CASI)

Sven Abend, Peter Berg, Michael Gilowski, C. Schubert, Gunnar Tackmann, Wolfgang A. Ertmer, Ernst Maria Rasel

Published May 1, 2011• 0 citations
Publisher

Abstract

In the paper the authors present an atomic gyroscope for the precise measurement of rotations based on optical Raman transitions for the coherent beam splitting process. Two interferometers with overlapping counter propagating atomic trajectories are used to distinguish between rotation and acceleration. Furthermore, we report on the present status of the apparatus including the analysis of systematic effects, which lead to the current limitation of the sensor. Finally, future improvements based on the provided analysis of the sensor will be discussed.

DOI
10.1109/cleoe.2011.5942975

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In the paper the authors present an atomic gyroscope for the precise measurement of rotations based on optical Raman transitions for the coherent beam splitting process. Two interferometers with overlapping counter propagating atomic trajectories are used to distinguish between rotation and acceleration. Furthermore, we report on the present status of the apparatus including the analysis of systematic effects, which lead to the current limitation of the sensor. Finally, future improvements based on the provided analysis of the sensor will be discussed.
Summary form only given. Matter wave interferometers have become very promising tools in fundamental physics and metrology. The sensitivities obtained with such atomic quantum sensors compete with classical state-of-the-art devices for acceleration and rotation measurements. Currently, we are setting up a new cold atom Sagnac interferometer (CASI) to realize high precision measurements of rotations with a compact and flexible setup. Using cold atoms the experiment aims to achieve sensitivities down to 2/spl times/10/sup -9/ rad/s/Hz for a compact interferometer as short as 15 cm. Rotations and accelerations will be discriminated by synchronous operation of two counterpropagating ensembles of ultra-cold atoms. We will give an overview about the concept and the parameters of our future interferometer. The results of the characterization of our 2D-MOT, which serves as a brilliant source for our cold atom interferometer, will be presented. The compact design of the sensor will be transportable. Thus, it will permit the comparison with other gyroscopes. CASI will be a first step towards a cold atom space experiment of the second generation.
We report improvements to our atom-interferometer based Sagnac gyroscope which uses stimulated Raman transitions to manipulate atomic wavepackets of cesium atoms. Using counter-propagating high-flux atomic beams, we form two interferometers with opposite Sagnac phase shifts that share key components such as Raman atomic state manipulation beams. Subtracting the two interferometer signals allows the common-mode rejection of spurious noise sources and various systematic effects. Preliminary results indicate a short term sensitivity of 3 X 10-9 (rad/s) (root) Hz.
We reports improvements to our Sagnac effect matter-wave interferometer gyroscope. This device now has a short-term rotation-rate sensitivity of 6 × 10 -10 rad s -1 over 1 s of integration, which is the best publicly reported value to date. Stimulated Raman transitions are used to coherently manipulate atoms from counterpropagating thermal beams, forming two interferometers with opposite rotation phase shifts, allowing rotation to be distinguished from acceleration and laser arbitrary phase. Furthermore, electronically compensating the rotation-induced Doppler shifts of the Raman lasers allows operation at an effective zero rotation rate, improving sensitivity and facilitating sensitive lock-in detection readout techniques. Long-term stability is promising but not yet fully characterized. Potential applications include inertial navigation, geophysical studies and tests of general relativity.