Enhancing tunability and conversion efficiency of Kerr soliton microcombs in crystalline microresonators

Microresonator-based optical frequency combs provide powerful and compact frequency comb sources that are of great importance to various applications requiring high-repetition rates and device miniaturization. Meanwhile, reliable spectral tunability and the improvement of conversion efficiency are still critical for the practical use of such comb sources. In this presentation, we will discuss our recent advancements in the development of soliton microcombs in ultrahigh-Q crystalline microresonators. We emphasize significant improvements in both the tunability and conversion efficiency of these systems. This work not only enhances our understanding of soliton dynamics but also broadens the potential utility of microcombs in various technological fields.