In the realization of ultrasmall semiconductor lasers, cavity-QED effects are used to enhance spontaneous emission and enable the lasing threshold to be crossed with gain contributions from only a few solid-state emitters. Operation in this regime fosters correlation effects that leave their fingerprint especially in the emission dynamics of nanolasers. Using time-resolved photon-correlation spectroscopy, we show that in a quantum-dot photonic-crystal nanolaser emitting in the telecom band, second-order coherence associated with lasing is established on a different timescale than the emission itself. By combining measurements with a microscopic semiconductor laser theory, we attribute the origin to carrier-photon correlations that give rise to non-Markovian effects in the emission dynamics that are not captured by laser rate-equation theories. Our results have direct implications with respect to the modulation response, repetition rate, noise characteristics, and coherence properties of nanolasers for device applications.

中文翻译：

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高Q纳米激光发射动力学中相干的延迟形成

在超小型半导体激光器的实现中，使用腔QED效应来增强自发发射，并使激光阈值能够与仅来自少数固态发射器的增益贡献相交。在这种情况下操作会促进相关性效应，使它们的指纹变得尤为明显，尤其是在纳米激光的发射动力学中。使用时间分辨的光子相关光谱，我们显示出在电信波段发射的量子点光子晶体纳米激光器中，与发射相关的二阶相干建立在与发射本身不同的时间尺度上。通过将测量结果与微观半导体激光理论相结合，我们将起源归因于载流子-光子相关性，该相关性在发射动力学中引起了非马氏效应，而这种非马尔科夫效应没有被激光速率方程理论捕获。