论文标题
低于阈值的冷原子激光的相干时间
Coherence time of a cold-atom laser below threshold
论文作者
论文摘要
我们通过实验研究了阈值低于拉曼激光的相干时间，其中增益培养基是磁性被捕获的原子的气体。二阶光学连贯性表现出具有相关时间的光子束，通过控制增益，这两个数量级都会变化。结果与一个简单的分析模型非常吻合，该模型表明该效果由增益而非分散占主导地位。腔环测量结果显示，光子寿命与一阶相干时间有关，也增加了。
We experimentally study the coherence time of a below-threshold Raman laser in which the gain medium is a gas of magneto-optically trapped atoms. The second-order optical coherence exhibits photon bunching with a correlation time which is varied by two orders of magnitude by controlling the gain. Results are in good agreement with a simple analytic model which suggests the effect is dominated by gain, rather than dispersion, in this system. Cavity ring-down measurements show the photon lifetime, related to the first-order coherence time, is also increased.
