Temporal complexity in emission from Anderson localized lasers
Temporal complexity in emission from Anderson localized lasers
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DOI：
10.1103/physreva.96.063816
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发表时间：
2017-12-12
影响因子：
2.9
通讯作者：
Mujumdar, Sushil
中科院分区：
文献类型：
--
作者：
Kumar, Randhir;Balasubrahmaniyam, M.;Mujumdar, Sushil
安德森定位激光器利用由于结构紊乱而形成的谐振腔。这些腔体结构固有的随机性实现了所有腔体参数（例如品质因数、模式体积、模式结构等）的概率分布，这意味着时间行为中所产生的统计波动。在这里，我们提供了内在和外在无序耦合微谐振器阵列中安德森定位激光脉冲的时间宽度分布的直接实验测量。我们首先说明了激光模式空间强度分布的特征指数衰减，量化了其局部特征，然后测量了几种配置下脉冲发射的时间宽度分布。我们观察到时间宽度对无序强度的依赖性，其中宽度在外在无序中显示单峰、左偏分布，在内在无序中显示双峰分布。我们提出了一种基于发射器和具有随机模式结构的安德森腔的耦合速率方程的模型，该模型与实验观察结果具有良好的定量和定性一致性。实验和理论分析凸显了基于安德森定位的激光系统的时间复杂性。
Anderson localization lasers exploit resonant cavities formed due to structural disorder. The inherent randomness in the structure of these cavities realizes a probability distribution in all cavity parameters such as quality factors, mode volumes, mode structures, and so on, implying resultant statistical fluctuations in the temporal behavior. Here we provide direct experimental measurements of temporal width distributions of Anderson localization lasing pulses in intrinsically and extrinsically disordered coupled-microresonator arrays. We first illustrate signature exponential decays in the spatial intensity distributions of the lasing modes that quantify their localized character, and then measure the temporal width distributions of the pulsed emission over several configurations. We observe a dependence of temporal widths on the disorder strength, wherein the widths show a single-peaked, left-skewed distribution in extrinsic disorder and a dual-peaked distribution in intrinsic disorder. We propose a model based on coupled rate equations for an emitter and an Anderson cavity with a random mode structure, which gives excellent quantitative and qualitative agreement with the experimental observations. The experimental and theoretical analyses bring to the fore the temporal complexity in Anderson-localization-based lasing systems.