Zero-velocity atom interferometry using a retroreflected frequency chirped laser

Abstract

Atom interferometry using stimulated Raman transitions in a retroreflected configuration is the first choice in high precision measurements because it provides low phase noise, high quality Raman wavefront and simple experimental setup. However, it cannot be used for atoms at zero velocity because two pairs of Raman lasers are simultaneously resonant. Here we report a method which allows to lift this degeneracy by using a frequency chirp on the Raman lasers. Using this technique, we realize a Mach-Zehnder atom interferometer hybridized with a force balanced accelerometer which provides horizontal acceleration measurements with a short-term sensitivity of $3.2\times 10^{-5}$ m.s${}^{-2}$/$\sqrt{Hz}$. We check at the level of precision of our experiment the absence of bias induced by this method. This technique could be used for multiaxis inertial sensors, tiltmeters or atom interferometry in a microgravity environment.

arXiv comment7 pages, 9 figures

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• Bragg-diffraction-induced imperfections of the signal in retroreflective atom interferometers
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• Spinor matterwave control with nanosecond spin-dependent kicks
• Emulating an Atomic Gyroscope with Multiple Accelerometers