Double diffraction in an atomic gravimeter

Abstract

We demonstrate the realization of a new scheme for cold atom gravimetry based on the use of double diffraction beamsplitters recently demonstrated in \cite{Leveque}, where the use of two retro-reflected Raman beams allows symmetric diffraction in $\pm \hslash k_{eff}$ momenta. Though in principle restricted to the case of zero Doppler shift, for which the two pairs of Raman beams are simultaneously resonant, we demonstrate that such diffraction pulses can remain efficient on atoms with non zero velocity, such as in a gravimeter, when modulating the frequency of one of the two Raman laser sources. We use such pulses to realize an interferometer insensitive to laser phase noise and some of the dominant systematics. This reduces the technical requirements and would allow the realization of a simple atomic gravimeter. We demonstrate a sensitivity of $1.2\times 10^{-7}g$ per shot.

References in corpus (7)

• Matter-wave interferometry in a double well on an atom chip
• Atom Interferometry with up to 24-Photon-Momentum-Transfer Beam Splitters
• Limits to the sensitivity of a low noise compact atomic gravimeter
• Large Momentum Beamsplitter using Bloch Oscillations
• Atom interferometers with scalable enclosed area
• Enhancing the area of a Raman atom interferometer using a versatile double-diffraction technique
• Wide bandwidth phase-locked diode laser with an intra-cavity electro-optic modulator

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