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The recent demonstration of dissipative Kerr solitons in microresonators hasopened a new pathway for the generation of ultrashort pulses and low-noisefrequency combs with gigahertz to terahertz repetition rates, enablingapplications in frequency metrology, astronomy, optical coherentcommunications, and laser-based ranging. A main challenge for solitongeneration, in particular in ultra-high-Q resonators, is the sudden change ofcirculating intracavity power during the onset of soliton generation. Thissudden power change requires precise control of the seed laser frequency andpower or fast control of the resonator temperature. Here, we report a robustand simple way to increase the stability range of the soliton regime by usingan auxiliary laser that passively stabilizes the intracavity power. In ourexperiments with fused silica resonators, we are able to extend the pump laserfrequency stability range of microresonator solitons by two orders ofmagnitude, which enables soliton generation by slow and manual tuning of thepump laser into resonance and at unprecedented low power levels. Both single-and multi-soliton mode-locked states are generated in a 1.3-mm-diameter fusedsilica microrod resonator with a free spectral range of ~50.6 GHz, at a 1554 nmpump wavelength at threshold powers <3 mW. Moreover, with a smaller230-{\mu}m-diameter microrod, we demonstrate soliton generation at 780 {\mu}Wthreshold power. The passive enhancement of the stability range ofmicroresonator solitons paves the way for robust and low threshold microcombsystems with substantially relaxed stability requirements for the pump lasersource. In addition, this method could be useful in a wider range ofmicroresonator applications that require reduced sensitivity to externalperturbations.

{\mu}W-Level Microresonator Solitons with Extended Stability Range Using an Auxiliary Laser