  Thermal noise usually dominates the low-frequency region of the optical phase
noise of soliton microcombs, leading to decoherence and limiting many aspects
of applications. In this work, we demonstrate a simple and reliable way to
mitigate this noise by laser cooling with the pump laser. The key is rendering
the pump laser to simultaneously excite two neighboring cavity modes from
different families that are respectively red and blue detuned, one for soliton
generation and the other one for laser cooling.
