Abstract
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 and Henry’s linewidth enhancement factor influence such signals. We show how the series coefficients can be extracted easily and explain how to determine and directly from them. Moreover, we draw a precise analogy between self-mixing and FM signals, showing that plays exactly the same role in self-mixing as the modulation index does in FM.
© 2014 Optical Society of America
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