本文在与波长为657nm的窄频带(375Hz)1S0→3P1共振的光学腔内制备出处于3P1亚稳态的冷钙原子样品。观察到双曲正割形脉冲向腔中的超辐射发射，其强度与原子数的平方成正比，持续时间比3P1态的自然寿命短得多，并且延迟时间与理论预期那样在发与发之间有波动。作者在1S0→3P1跃迁上产生反转的非相干泵浦方案可扩展，以允许进行连续波激光操作。
图1：准备反演的两个步骤在(a)和(b)中进行了概述。沿x轴形成具有线性偏振的800.8nm的腔内晶格。P1和P2分别表示沿y轴和x轴具有线性偏振的光泵浦激光器,分别在432 nm和429 nm下工作。用光子计数器记录在657 nm处的激光发射。
This research is published in Physical Review Letters.
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