Rapid production of a 85Rb Bose-Einstein condensate in a double compressible optical dipole trap
Rapid production of a 85Rb Bose-Einstein condensate in a double compressible optical dipole trap
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在双可压缩光学偶极子陷阱中快速产生 85Rb 玻色-爱因斯坦凝聚态
DOI：
10.1103/physreva.102.023316
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发表时间：
2020
影响因子：
2.9
通讯作者：
and Toshiya Kinoshita
中科院分区：
文献类型：
--
作者：
Haruka Otoishi;Shu Nagata;Takumi Yukawa;Kazuya Yamashita;and Toshiya Kinoshita
我们发展了一种全光学方法来快速产生大的玻色-爱因斯坦凝聚体。由于其碰撞性质，它被认为是一种很难冷却到量子简并的物质。我们解决了这些内在的困难相结合的偏振梯度冷却的三维光学晶格和可压缩的双交叉偶极陷阱（DCDT）。这种晶格冷却绕过了低再热率，并将多个相空间密度大于的原子装入扩大的DCDT中。尺寸可调的DCDT中的后续压缩和蒸发可以最大限度地提高冷却效率，同时减少不必要的非弹性损失。我们固定的偏置磁场为161 G的波散射长度是积极的和大的。在平均密度为时，强迫蒸发对非弹性碰撞起很好的作用。在3.2秒的蒸发时间内产生了几乎纯的原子凝聚物。
We develop an all-optical method to rapidly produce a largeBose-Einstein condensate.has a reputation as a difficult species to cool to quantum degeneracy due to its collisional properties. We solve these intrinsic difficulties by a combination of polarization gradient cooling in a 3D optical lattice and a compressible double-crossed dipole trap (DCDT). This lattice cooling circumvents the low rethermalization rate and loads more thanatoms with a phase-space density larger thaninto the enlarged DCDT. The subsequent compressions and evaporations in the size-adjustable DCDT can maximize the cooling efficiency while reducing unnecessary inelastic losses. We fix the bias magnetic field to 161 G where the-wave scattering length is positive and large. The forced evaporations function well against inelastic collisions at an average density of. A nearly pure condensate ofatoms is produced in 3.2 s of evaporation time.