Fundamentals of the theory of self-injection locking of multi-frequency laser diode to high-Q optical microresonator

In this work we present a theoretical model describing a phenomenon of self-injection locking of multi-frequency laser to high-Q optical microresonator. Such process allows high-power single-frequency emission with sub-kHz linewidth from the compact multi-frequency diode laser. Elaborated theory takes into account fast optical feedback due to the Rayleigh scattering, mode competition effect and Bogatov asymmetric mode interaction. (paper)