论文标题
ER中的级联超荧光：YLF
Cascade Superfluorescence in Er:YLF
论文作者
论文摘要
我们报告了对在1.6 K处连续抽出的Erbium掺杂的YLIF $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ 1％和0.01％晶体在1.6 k中引起的配对光子脉冲的分析。排放是由随后的相干状态的自发形成产生的。观察到的配对脉冲之间的时间间隔的波动，最重要的是，它与第二脉冲持续时间的相关性，表明erbium离子的相干性确实是通过真空波动播种的。
We report the analysis of paired photon pulses arising from two cascading transitions in continuously pumped Erbium-doped YLiF$_4$ 1% and 0.01% crystals at 1.6 K. The dependence of the pulse peak intensity on the squared number of involved Erbium ions, between 10$^{11}$ and 10$^{13}$, definitely identifies the cooperative nature of the two pulsed emissions, that are generated by the subsequent, spontaneous formation of coherent states. The observed fluctuations of the time interval between the paired pulses and, most importantly, its correlation with the second pulse duration, demonstrate that the Erbium ions coherence is indeed seeded by vacuum fluctuations.
