Abstract
We report on the implementation of degenerate Raman sideband cooling of K40 atoms. The scheme incorporates a three-dimensional (3D) optical lattice, which confines the atoms and drives the Raman transitions. The optical cooling cycle is closed by two optical pumping beams. The wavelength of the laser beams forming the lattice is close to the D2 atomic transition, while the optical pumping is operated near the D1 transition. With this cooling method, we achieve a temperature of ∼1μK of a cloud with ∼107 atoms. This corresponds to a phase space density of ≥10-3. Moreover, the fermionic ensemble is spin polarized to conditions which are favorable for subsequent evaporative cooling. We study the dependence of the cooling scheme on several parameters, including the applied magnetic field and the detuning, duration, and intensity profile of the optical pumping beams. Adding this optical cooling stage to current Fermi gas experiments can improve the final conditions and increase the data rate.
Original language | English |
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Article number | 063111 |
Journal | Physical Review A |
Volume | 106 |
Issue number | 6 |
DOIs | |
State | Published - Dec 2022 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics