Power-law fluctuations near critical point in semiconductor lasers with delayed feedback
Power-law fluctuations near critical point in semiconductor lasers with delayed feedback
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DOI：
10.1103/physrevresearch.4.043205
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发表时间：
2021-11
影响因子：
4.2
通讯作者：
T. Niiyama;S. Sunada
中科院分区：
文献类型：
--
作者：
T. Niiyama;S. Sunada
自20世纪70年代激光振荡和二级相变之间的类比被指出以来，临界现象中固有的激光阈值的动力学波动引起了人们的极大兴趣。在这里，我们数值和实验证明，半导体激光器受到延迟光反馈可以表现出不寻常的大强度波动的幂律分布的特征。这样的强度波动由光强度的不同间歇性突发组成，其峰值达到最大增益模式强度的数十倍。当具有长时间延迟（超过100 ns）和最佳反馈强度的激光器在激光阈值附近工作时，就会出现这种突发行为。强度和等待时间统计遵循幂律分布。这意味着非平衡临界现象的出现，即自组织临界性。除了数值计算结果，我们报告的实验结果表明，在半导体激光器中的延迟反馈的幂律强度动力学。
Since the analogy between laser oscillation and second-order phase transition was indicated in the 1970s, dynamical fluctuations on lasing threshold inherent in critical phenomena have gained significant interest. Here, we numerically and experimentally demonstrate that a semiconductor laser subject to delayed optical feedback can exhibit unusual large intensity fluctuations characterized by power-law distributions. Such an intensity fluctuation consists of distinct intermittent bursts of light intensity, whose peak values attain tens of times the intensity of the maximum gain mode. This burst behavior emerges when a laser with a long time delay (over 100 ns) and an optimal feedback strength operates around the lasing threshold. The intensity and waiting time statistics follow power-law-like distributions. This implies the emergence of nonequilibrium critical phenomena, namely self-organized criticality. In addition to numerical results, we report experimental results that suggest the power-law intensity dynamics in a semiconductor laser with delayed feedback.