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arXiv 1802.07047physics.optics
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Anderson局域激光器辐射的时间复杂性

Temporal complexity in emission from Anderson localized lasers

Randhir Kumar, M. Balasubrahmaniyam, K Shadak Alee, Sushil Mujumdar

摘要:

安德森局域化激光器利用由于结构无序而形成的谐振腔。这些腔的结构中的固有随机性实现了所有腔参数(诸如品质因数、模体积、模结构等)中的概率分布,这意味着在时间行为中产生的统计波动。在这里,我们提供了第一个,直接的实验测量的时间宽度分布的安德森局域化激光脉冲的内在和外在的无序耦合微谐振器阵列。我们首先说明签名指数衰减的激光模式,量化其本地化的字符的空间强度分布,然后测量的时间宽度分布的脉冲发射在几个配置。我们观察到一个迄今未报道的依赖性的时间宽度上的障碍强度,其中的宽度显示出一个单峰,左偏分布在外在的障碍和双峰分布在内在的障碍。我们提出了一个模型的基础上耦合速率方程的发射器和安德森腔的随机模式结构,这给出了很好的定量和定性的协议与实验观察。实验和理论分析突出了基于安德森局域化的激光系统的时间复杂性。

英文摘要:

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 etc, implying resultant statistical fluctuations in the temporal behavior. Here, we provide the first, 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 hitherto-unreported 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.

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