Versatile tuning of Kerr soliton microcombs in crystalline microresonators

Shun Fujii, Koshiro Wada, Ryo Sugano, Hajime Kumazaki, Soma Kogure, Yuichiro K. Kato, Takasumi Tanabe

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Microresonator-based optical frequency combs emitted from high-quality-factor microresonators, also known as microcombs, have opened up new horizons to areas of optical frequency comb technology including frequency metrology, precision sensing, and optical communication. To extend the capability of microcombs for such applications, large and reliable tunability is of critical importance. Here, we show broad spectral tuning of Kerr soliton microcombs in a thermally controlled crystalline microresonator with pump-detuning stabilization. The fundamental elements composing frequency combs, namely the center frequency, repetition frequency, and carrier-envelope offset frequency, are spectrally tuned by up to −48.8 GHz, −5.85 MHz, and −386 MHz, respectively, leveraging thermal effects in ultrahigh-Q crystalline magnesium fluoride resonators. We further demonstrate a 3.4-fold enhancement of soliton comb power resulting from thermal expansion with a temperature change of only 28 K by employing quantitative analyses of the fiber-to-resonator coupling efficiency.

Original languageEnglish
Article number1
JournalCommunications Physics
Issue number1
Publication statusPublished - 2023 Dec

ASJC Scopus subject areas

  • General Physics and Astronomy


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