Direct tuning of soliton microcombs in ultrahigh-Q MgF2 crystalline microresonator

• 1、School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China
• 2、School of Artificial Intelligence, Beijing Normal University, Beijing, 100875, China

Abstract：The dissipative Kerr soliton combs based on microresonators have attracted wide attention due to their high coherence and on-chip integration. Soliton microcombs have been proven to have broad application prospects in the fields of coherent communication, on-chip low-noise microwave generation, optical clock, etc. However, most applications for tuning the bandwidth of soliton microcombs use a thermoelectric cooler (TEC), which increases the complexity of the system. Here, we have fabricated a magnesium fluoride microresonator with an ultrahigh-quality factor of about 927 million. Use \'power-kicking\' technology to actively capture and stabilize solitons. Then, the bandwidth and recoil of the solitons are tuned directly by the acousto-optic modulator of the system. We have demonstrated that this technique provides more direct and concise feedback and reduces the complexity and cost of the system.

keywords： nonlinear optics microresonator dissipative Kerr soliton soliton tuning

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