Evaporative cooling of cesium in a surface trap

M. Hammes, D. Rychtarik, V. Druzhinina, R. Grimm
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Abstract

Summary form only given. Optical dipole traps facilitate storage of atoms independent of their magnetic sub-state. Trapping at high densities is thus not limited by two-body collisions changing the spin state of the atom, which in the particular case of cesium have so far prevented the attainment of Bose-Einstein condensation in magnetic traps. For evaporative cooling of Cs we use the gravito-optical surface trap (GOST) which consists of a horizontal evanescent-wave (EW) atom mirror in combination with a blue-detuned hollow beam (HE) for transverse confinement. Starting conditions for evaporative cooling are prepared by optical cooling, based on inelastic reflections from the EW.
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表面捕集器中铯的蒸发冷却
只提供摘要形式。光学偶极子阱有助于独立于其磁亚态的原子的存储。因此,高密度的俘获不受改变原子自旋状态的两体碰撞的限制,在铯的特殊情况下,这种碰撞迄今为止阻碍了磁阱中玻色-爱因斯坦凝聚的实现。对于铯的蒸发冷却,我们使用了重力光学表面阱(GOST),它由一个水平倏逝波(EW)原子反射镜和一个蓝色失谐空心光束(HE)组成,用于横向约束。利用电子波的非弹性反射,通过光学冷却制备蒸发冷却的起始条件。
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