Han DJ, Wolf S, Oliver S, McCormick C, DePue MT, Weiss DS
Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA.
Phys Rev Lett. 2000 Jul 24;85(4):724-7. doi: 10.1103/PhysRevLett.85.724.
We laser cool 5x10(7) Cs atoms to a spin-polarized phase space density of 1/30, the highest ever obtained by laser cooling. It is achieved by compression and polarization gradient cooling in a 3D far-off-resonant optical lattice, followed by 3D Raman sideband cooling optimized at a density of 1.5x10(12) atoms/cm(3), and adiabatic release. In the lattice, 23% of the sites are occupied, 95% of the atoms are in the lowest energy magnetic sublevel, and 37% are in the lowest 3D vibrational state.
我们将5×10⁷个铯原子激光冷却至自旋极化相空间密度为1/30，这是通过激光冷却获得的有史以来最高的值。这是通过在三维远失谐光学晶格中进行压缩和极化梯度冷却，然后在密度为1.5×10¹²原子/立方厘米时对三维拉曼边带冷却进行优化，以及绝热释放来实现的。在晶格中，23%的格点被占据，95%的原子处于最低能量磁子能级，37%处于最低的三维振动状态。
