无反射镜参量振荡器的阈值和线宽
Threshold and linewidth of a mirrorless parametric oscillator
摘要：
我们分析了在相干驱动的稠密原子蒸气中基于共振增强四波混频的无镜参量振荡器的阈上行为。结果表明，在理想极限下，任意小的泵浦光通量就足以达到振荡器的阈值。我们证明，由于与相干介质相关的大群速度延迟，一个非常窄的振荡器线宽是可能的，使得窄带源的非经典辐射可行。
英文摘要：
We analyze the above-threshold behavior of a mirrorless parametric oscillator based on resonantly enhanced four wave mixing in a coherently driven dense atomic vapor. It is shown that, in the ideal limit, an arbitrary small flux of pump photons is sufficient to reach the oscillator threshold. We demonstrate that due to the large group-velocity delays associated with coherent media, an extremely narrow oscillator linewidth is possible, making a narrow-band source of non-classical radiation feasible.
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