Laser cooling of strontium atoms toward quantum degeneracy
Laser cooling of strontium atoms toward quantum degeneracy
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激光冷却锶原子以实现量子简并
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Kuwata
中科院分区：
文献类型：
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作者：
H. Katori;T. Ido;Y. Isoya;M. Kuwata
报道了近量子简并态锶原子的窄谱线激光冷却和囚禁。在689 nm的自旋禁戒跃迁1S0−3P1上使用磁光阱（MOT），我们用激光将原子样品冷却到光子反冲温度为400 nK，相空间密度为10−2。然后，原子被压缩到一种新型的远场共振光学偶极阱中，该阱被设计为允许同时多普勒冷却，导致相空间密度为量子简并所需的10%。结果表明，该值最终是有限的光辅助碰撞发生在光学冷却。为了减少这些非弹性损失，我们采用蒸发冷却，并证明了一个创建的二维原子gas.We报告的窄线激光冷却和量子简并附近的锶原子捕获。在689 nm的自旋禁戒跃迁1S0−3P1上使用磁光阱（MOT），我们用激光将原子样品冷却到光子反冲温度为400 nK，相空间密度为10−2。然后，原子被压缩到一种新型的远场共振光学偶极阱中，该阱被设计为允许同时多普勒冷却，导致相空间密度为量子简并所需的10%。结果表明，该值最终是有限的光辅助碰撞发生在光学冷却。为了减少这些非弹性损失，我们应用了蒸发冷却，并演示了二维原子气体的创建。
We report on a narrow-line laser cooling and trapping of strontium atoms near quantum degeneracy. Employing a magneto-optical trap (MOT) on the spin-forbidden transition 1S0−3P1 at 689 nm, we have laser-cooled an atomic sample down to the photon recoil temperature of 400 nK with a phase space density of 10−2. The atoms were then compressed into a new type of far-off resonance optical dipole trap that was designed to allow simultaneous Doppler cooling, resulting in a phase space density of 10% to that required for quantum degeneracy. It is shown that this value is finally limited by light-assisted collisions occurring in the optical cooling. To reduce these inelastic losses, we applied evaporative cooling and demonstrated a creation of two-dimensional atomic gases.We report on a narrow-line laser cooling and trapping of strontium atoms near quantum degeneracy. Employing a magneto-optical trap (MOT) on the spin-forbidden transition 1S0−3P1 at 689 nm, we have laser-cooled an atomic sample down to the photon recoil temperature of 400 nK with a phase space density of 10−2. The atoms were then compressed into a new type of far-off resonance optical dipole trap that was designed to allow simultaneous Doppler cooling, resulting in a phase space density of 10% to that required for quantum degeneracy. It is shown that this value is finally limited by light-assisted collisions occurring in the optical cooling. To reduce these inelastic losses, we applied evaporative cooling and demonstrated a creation of two-dimensional atomic gases.