All-optical production of {sup 7}Li Bose-Einstein condensation using Feshbach resonances
All-optical production of {sup 7}Li Bose-Einstein condensation using Feshbach resonances
复制标题
使用 Feshbach 共振全光学产生 {sup 7}Li Bose-Einstein 凝聚
DOI：
10.1103/physreva.77.023604
复制
发表时间：
2007
影响因子：
2.9
通讯作者：
L. Khaykovich
中科院分区：
文献类型：
--
作者：
N. Gross;L. Khaykovich
我们展示了一种全光学的方法，使{sup 7}锂凝聚使用的散射长度在附近的Feshbach共振的可调谐性。我们报告了两个Feshbach共振的观察，|F=1，m{sub F}=0>状态。在831{+-}4 G（884{sub-13}{sup +4} G）处检测到7 G（34 G）宽度的窄（宽）共振。在836{+-} 4G处发现共振之间的散射长度零交叉的位置。宽共振被证明是有利的失控蒸发，我们在交叉光束的光学偶极阱中执行。直接从磁光阱的相空间密度出发，我们观察到一个玻色-爱因斯坦凝聚阈值在不到3秒的强制蒸发。
We show an all-optical method of making {sup 7}Li condensates using the tunability of the scattering length in the proximity of a Feshbach resonance. We report the observation of two Feshbach resonances on the |F=1,m{sub F}=0> state. A narrow (broad) resonance of 7 G (34 G) width is detected at 831{+-}4 G (884{sub -13}{sup +4} G). The position of the scattering length zero crossing between the resonances is found at 836{+-}4 G. The broad resonance is shown to be favorable for runaway evaporation which we perform in a crossed-beam optical-dipole trap. Starting directly from the phase-space density of a magneto-optical trap we observe a Bose-Einstein condensation threshold in less than 3 s of forced evaporation.