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The use of Raman laser generated by modulation for light-pulse atominterferometer allows to have a laser system more compact and robust. However,the additional laser frequencies generated can perturb the atom interferometer.In this article, we present a precise calculation of the phase shift induced bythe additional laser frequencies. The model is validated by comparison withexperimental measurements on an atom gravimeter. The uncertainty of the phaseshift determination limits the accuracy of our compact gravimeter at 8.10^-8m/s^2. We show that it is possible to reduce considerably this inaccuracy witha better control of experimental parameters or with particular interferometerconfigurations.

Phase shift in an atom interferometer induced by the additional laser lines of a Raman laser generated by modulation