Directional Bistability and Nonreciprocal Lasing with Cold Atoms in a Ring Cavity.
Directional Bistability and Nonreciprocal Lasing with Cold Atoms in a Ring Cavity.
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DOI：
10.1103/physrevlett.121.163603
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发表时间：
2018-10
影响因子：
8.6
通讯作者：
B. Megyeri;G. Harvie;A. Lampis;J. Goldwin
中科院分区：
文献类型：
--
作者：
B. Megyeri;G. Harvie;A. Lampis;J. Goldwin
我们演示了用冷原子气体作增益介质时，环形腔中反向传播模的激光。激光器在没有附加场的磁光捕获的通常条件下工作。我们表征了激光器的阈值行为，并测量了二阶光学相干性。激光发射表现出方向双稳性，顺时针和逆时针模式之间随机切换，观察到一个可调谐的非互易性原子沿沿着腔轴位移。
We demonstrate lasing into counterpropagating modes of a ring cavity using a gas of cold atoms as a gain medium. The laser operates under the usual conditions of magneto-optical trapping with no additional fields. We characterize the threshold behavior of the laser and measure the second-order optical coherence. The laser emission exhibits directional bistability, switching randomly between clockwise and counterclockwise modes, and a tunable nonreciprocity is observed as the atoms are displaced along the cavity axis.