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Self-injection locking to a high-quality-factor microresonator is a keycomponent of various up-to-date photonic applications, including compactnarrow-linewidth lasers and microcomb sources. For optimal construction of suchdevices it is necessary to know the parameters of the locking mode, which is achallenging task. We developed and verified experimentally an originaltechnique based on the fundamentals of the self-injection locking effect, whichallows determining the key parameters of the mode of the microresonator(quality factor, vertical index) as well as laser diode parameters. Wedemonstrated that this method can be used in the spectral ranges whereconventional methods are not applicable, for example, in the mid-IR. Westabilized a 2.64 $\mu$m laser diode by a high-Q whispering gallery modemicroresonator made of crystalline silicon. Using the elaborated technique, thequality factor of the microresonator was determined to be $5\cdot10^8$.

Microresonator and Laser Parameters Definition via Self-Injection Locking