延迟光的连续产生
Continuous generation of delayed light
摘要：
我们利用拉曼四波混频过程从连续写入的原子相干性中读出光。光在有效延迟后连续产生，允许原子相干性在此过程中演变。与依赖于介质光学深度的慢光延迟相反，这里的产生延迟仅由系统的强度特性决定，在弱驱动极限下接近原子相干寿命。生成的光是无背景的。我们利用空间扩散作为原子演化时间的“内部时钟”来实验探测这些性质。
英文摘要：
We use a Raman four-wave mixing process to read-out light from atomic coherence which is continuously written. The light is continuously generated after an effective delay, allowing the atomic coherence to evolve during the process. Contrary to slow-light delay, which depends on the medium optical depth, here the generation delay is determined solely by the intensive properties of the system, approaching the atomic coherence lifetime at the weak driving limit. The generated light is background free. We experimentally probe these properties utilizing spatial diffusion as an 'internal clock' for the atomic evolution time.
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