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Piégeage magnétique d’atomes ultrafroids
Chargement du mirror-MOT
Atoms from the low velocity beam are recaptured in a mirror-MOT in front of the chip reflecting surface. Two counter-propagating laser beams are forming a 45 deg angle with the chip surface in the $yz$ plane and two others are propagating in opposite directions along the x axis. All beams, brought to the experiment by polarization-maintaining fibers, have a 5 mm waist and a power of 8.5 mW. A fiber-coupled repumping beam (600 μW) is also sent along the x direction.
The necessary (...)
Du mirror-MOT au piégeage magnétique
Transfer to an on-chip mirror-MOT
The initial mirror-MOT loading lasts 5 s. The 2D-MOT lasers are switched off 100 ms before the end of the loading, allowing the slowest atoms to reach the mirror-MOT. The trapped atoms are then transferred in 20 ms into the on-chip mirror MOT, whose magnetic field is produced by the U-wire and the uniform bias (the laser parameters are left unchanged). We decrease the current in the quadrupole coil $I_Q$ linearly from 1.77 A down to 0 A, increase (...)
