Figure 3. Vacuum chambers and main laser beams. A beam of pre-cooled atoms, initially released from the two isotopes reservoirs (light blue), is pushed from the 2D+-MOT to the main science chamber via a differential pumping stage. A MOT is loaded right above the center of the atom chip and the atoms are pre-evaporated, after being loaded in the chip trap, using the chip RF antenna. The dipole lasers are depicted by the crossed red beams which trap the atoms at the chip vicinity to finalize the evaporation process. Once the two BECs are obtained, the interferometry pulses are applied by a couple of Raman beams (large light blue beam) along the sensitive axis.