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We present a precision gravimeter based on coherent Bragg diffraction offreely falling cold atoms. Traditionally, atomic gravimeters have usedstimulated Raman transitions to separate clouds in momentum space by drivingtransitions between two internal atomic states. Bragg interferometers utilizeonly a single internal state, and can therefore be less susceptible toenvironmental perturbations. Here we show that atoms extracted from amagneto-optical trap using an accelerating optical lattice are a suitablesource for a Bragg atom interferometer, allowing efficient beamsplitting andsubsequent separation of momentum states for detection. Despite the inherentlymulti-state nature of atom diffraction, we are able to build a Mach-Zehnderinterferometer using Bragg scattering which achieves a sensitivity to thegravitational acceleration of $\Delta g/g = 2.7\times10^{-9}$ with anintegration time of 1000s. The device can also be converted to a gravitygradiometer by a simple modification of the light pulse sequence.

Precision atomic gravimeter based on Bragg diffraction