Positronium Laser Cooling via the 1 3 S - 2 3 P Transition with a Broadband Laser Pulse
Positronium Laser Cooling via the 1 3 S - 2 3 P Transition with a Broadband Laser Pulse
复制标题
使用宽带激光脉冲通过 1 3 S - 2 3 P 跃迁进行正电子激光冷却
DOI：
10.1103/physrevlett.132.083402
复制
发表时间：
2024
影响因子：
8.6
通讯作者：
Glöggler L
中科院分区：
文献类型：
--
作者：
Glöggler L
我们报道了用宽带长脉冲243 nm翠绿宝石激光强饱和跃迁，对自由飞行中的大部分正电子离子（Ps）进行激光冷却。基态Ps云是在无磁场和无电场的环境中产生的。我们观察到两种不同的激光诱导效应。第一个效应是，在Ps处于长寿命态的时间过后，处于基态的原子数量增加。第二个效应是Ps的一维多普勒冷却，使云的温度从380(20)k降低到170(20)k。
We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating thetransition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-livedstates. The second effect is one-dimensional Doppler cooling of Ps, reducing the cloud’s temperature from 380(20) to 170(20) K. We demonstrate a 58(9)% increase in the fraction of Ps atoms with.