Taimre Thomas, Rakić Aleksandar D
Appl Opt. 2014 Feb 10;53(5):1001-6. doi: 10.1364/AO.53.001001.
Quasi-static interferometric signals in lasers under feedback arise from slowly varying perturbations of the intracavity electric field resulting from the reinjection of a portion of the emitted field into the cavity. Such interferometric signals are well described by the steady-state solution to the Lang-Kobayashi rate equation model. We give an exact series expansion for this steady-state solution that shows precisely how Acket's characteristic parameter C and Henry's linewidth enhancement factor α influence such signals. We show how the series coefficients can be extracted easily and explain how to determine C and α directly from them. Moreover, we draw a precise analogy between self-mixing and FM signals, showing that C plays exactly the same role in self-mixing as the modulation index does in FM.
反馈作用下激光器中的准静态干涉信号源于腔内电场的缓慢变化扰动，这种扰动是由一部分出射光场重新注入腔内引起的。此类干涉信号可以通过朗 - 小林速率方程模型的稳态解得到很好的描述。我们给出了该稳态解的精确级数展开式，精确展示了阿克特特征参数C和亨利线宽增强因子α如何影响此类信号。我们展示了如何轻松提取级数系数，并解释了如何直接从这些系数确定C和α。此外，我们在自混合和调频信号之间建立了精确的类比，表明C在自混合中所起的作用与调制指数在调频中所起的作用完全相同。
