论文标题
Fano激光器中的线宽理论
Theory of Linewidth-Narrowing in Fano Lasers
论文作者
论文摘要
我们提出了一种基于连续体中界面状态的Fano激光器相干的一般理论。我们发现，这样的激光可以使量子限制线宽的数量级降低，并且通过引入镜像对称性破坏，可以进一步降低线宽。但是，与普通的宏观激光器相反，由于强光定位增强了光学非线性，线宽可能会重新延伸。这导致了最佳材料系统的识别。我们还表明，可以使用简单，有效的潜在模型直观地理解这种新型微观激光的连贯性。基于此模型，我们检查了激光稳定性，并推断激光线宽对一般Fano线路的依赖性。我们的模型促进了其他设计自由度的结合，可以应用于具有强烈分散镜的一般激光器类别。
We present a general theory for the coherence of Fano lasers based on a bound state in the continuum. We find that such lasers enable orders of magnitude reduction of the quantum-limited linewidth, and by introducing mirror symmetry breaking, the linewidth can be further reduced. In contrast to ordinary macroscopic lasers, though, the linewidth may re-broaden due to optical nonlinearities enhanced by the strong light localization. This leads to the identification of optimal material systems. We also show that the coherence of this new type of microscopic laser can be understood intuitively using a simple, effective potential model. Based on this model, we examine the laser stability and deduce the dependence of the laser linewidth on the general Fano lineshape. Our model facilitates the incorporation of other degrees of design freedom and can be applied to a general class of lasers with strongly dispersive mirrors.
