Theory of random lasing and light localization in strongly disordered media

强无序介质中的随机激光和光定位理论

• 批准号: 5441996
• 负责人: Professor Dr. Johann Kroha
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5441996?language=en
• 关键词: Theory; random; lasing; light; localization

In a random laser the feedback mechanism necessary for laser action is provided by the reduced diffusion and possibly confinement of light due to multiple random scattering in a strongly disordered, laser-active medium. In this project a theory for random lasers with coherent feedback is developed on a microscopic level, considering especially the possibility of light confinement due to Anderson localization of light. We construct a diagrammatic theory for the Anderson localization of light, incorporating both diffusion and Cooperon contributions by means of a controlled, selfconsistent resummation, and taking into account especially the modifications of the theory of light diffusion and localization due to the violation of particle number or energy conservation in an amplifying medium. The mutual interplay between light amplification, described by the semiclassical laser rate equations, and light confinement due to disorder is studied. We expect to provide quantitative predictions for possible pathways to the experimental realization of light localization either via band structure effects in disordered photonic band gap materials or via the consequences of coherent light amplification.

在随机激光器中，激光作用所需的反馈机制是通过减少漫射以及由于强烈无序的激光活性介质中的多次随机散射而可能限制光来提供的。在该项目中，在微观层面上开发了具有相干反馈的随机激光器理论，特别考虑了由于安德森光局域化而导致光限制的可能性。我们构建了光的安德森局域化的图解理论，通过受控的、自洽的恢复结合了扩散和库珀伦的贡献，并特别考虑到由于违反放大介质中的粒子数或能量守恒而对光扩散和局域化理论的修改。研究了由半经典激光速率方程描述的光放大与无序引起的光限制之间的相互作用。我们期望通过无序光子带隙材料中的能带结构效应或通过相干光放大的结果，为实验实现光定位的可能途径提供定量预测。

项目成果

Light Propagation in Anisotropic Disordered Media

各向异性无序介质中的光传播

• DOI: 10.1063/1.3253883
• 发表时间: 2009
• 作者: Andreas Lubatsch;Regine Frank
• 通讯作者: Regine Frank

Theoretical Approach to Random Lasing in thin Systems on reflecting Substrates

反射基底薄系统中随机激光发射的理论方法

• DOI: 10.1063/1.3253878
• 发表时间: 2009
• 作者: Regine Frank;Andreas Lubatsch;Johann Kroha
• 通讯作者: Johann Kroha