Off-resonant Raman transitions impact in an atom interferometer
  We study the influence of off-resonant two photon transitions on high precision measurements with atom interferometers based on stimulated Raman transitions. These resonances induce a two photon light shift on the resonant Raman condition. The impact of this effect is investigated in two highly sensitive experiments: a gravimeter and a gyroscope-accelerometer. We show that it can lead to significant systematic phase shifts, which have to be taken into account in order to achieve best performances in term of accuracy and stability. 
A. Gauguet (SYRTE), Tanja Mehlst\"aubler (SYRTE), Thomas L\'ev\`eque   (SYRTE), J. Le Gou\"et (SYRTE), Oualid Chaibi (SYRTE)...