Production of 87Rb Bose-Einstein condensates in a hybrid trap

• Published in: 中国物理B：英文版 2013 (5), p.417-420
• Main Author: 段亚凡 姜伯楠 孙剑芳 刘亢亢 徐震 王育竹
• Format: Article
• Language: English
• Subjects: 光学陷阱; 凝聚体; 无线电频率; 混合动力车; 爱因斯坦凝聚; 玻色; 生产; 蒸发冷却
• ISSN: 1674-1056; 2058-3834

We report a rapid evaporative cooling method using a hybrid trap which is composed of a quadrupole magnetic trap and a one-beam optical dipole trap. It contains two kinds of evaporative coolings to reach the quantum degeneracy： initial radio-frequency （RF） enforced evaporative cooling in the quadrupole magnetic trap and further runaway evaporative cooling in the optical dipole trap. The hybrid trap does not require a very high power laser such as that in the traditional pure optical trap, but still has a deep trap depth and a large trap volume, and has better optical access than the normal magnetic trap like the quadrupole-Ioffe-configuration （QUIC） cloverleaf trap. A high trap frequency can be easily realized in the hybrid trap to enhance the elastic collision rate and shorten the evaporative cooling time. In our experiment, pure Bose-Einstein condensates （BECs） with about 1 x 105 atoms can be realized in 6 s evaporative cooling in the optical dipole trap.