Decoupling gain and feedback in coherent random lasers: experiments and simulations.
Decoupling gain and feedback in coherent random lasers: experiments and simulations.
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DOI：
10.1038/srep16848
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发表时间：
2015-11-18
影响因子：
4.6
通讯作者：
López C
中科院分区：
文献类型：
--
作者：
Consoli A;López C
我们提出并证明了一种相干随机激光器，其中随机分布的散射中心被放置在有源区之外。这种结构是通过将染料溶液封闭在随机定位的二氧化钛纳米颗粒的两个聚集体之间来实现的。从二氧化钛纳米颗粒的两个集合中检测到相同的光谱特征，其由具有随机光谱位置的尖锐尖峰组成。我们解释这种新观察到的行为，由于从散射凝聚，这也作为输出耦合器的背散射光的光反馈。一个简单的模型来模拟所观察到的行为，考虑到幅度和相位往返的条件，必须满足维持激光作用。数值模拟重现了实验报告，验证了我们的简单模型。所提出的结果提出了一种新的理论和实验方法，用于研究相干随机激光器的复杂行为，并刺激实现基于所提出的架构，具有不同的活性和散射材料的新设备。
We propose and demonstrate a coherent random laser in which the randomly distributed scattering centres are placed outside the active region. This architecture is implemented by enclosing a dye solution between two agglomerations of randomly positioned titanium dioxide nanoparticles. The same spectral signature, consisting of sharp spikes with random spectral positions, is detected emerging from both ensembles of titanium dioxide nanoparticles. We interpret this newly observed behaviour as due to the optical feedback given by back-scattered light from the scattering agglomerations, which also act as output couplers. A simple model is presented to simulate the observed behaviour, considering the amplitude and phase round trip conditions that must be satisfied to sustain lasing action. Numerical simulations reproduce the experimental reports, validating our simple model. The presented results suggest a new theoretical and experimental approach for studying the complex behavior of coherent random lasers and stimulate the realization of new devices based on the proposed architecture, with different active and scattering materials.