Temporal cavity solitons and frequency combs via quantum interference

Temporal cavity solitons in ring microresonators provide broad and controllable generation of frequency combs with applications standards precise atomic clocks. Three level media the {\Lambda} configuration inside displaying electromagnetically induced transparency can be used for temporal presence anomalous dispersion two external driving fields close to resonance. Here, domain walls separating regions dark states due quantum interference correspond realizations stimulated Raman adiabatic passage without input pulses. With no need modulational instabilities, bright are formed when these lock each other. Wide stability ranges, resonance operation optimal shape three-level make them preferable those two-level media.