Brillouin lasing in coupled silica toroid microcavities

Yoshihiro Honda, Wataru Yoshiki, Tomohiro Tetsumoto, Shun Fujii, Kentaro Furusawa, Norihiko Sekine, Takasumi Tanabe

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We demonstrate stimulated Brillouin scattering lasing in a strongly coupled microcavity system. By coupling two silica toroid microcavities, we achieve large mode splitting of 11 GHz, whose frequency separation matches the Brillouin frequency shift of silica. The stimulated Brillouin scattering light is resonantly amplified by pumping at the higher frequency side of the supermode splitting resonance. Since the mode splitting is adjusted by changing the gap distance between the two cavities, our system does not require precise control of a mm-sized cavity diameter to match the free-spectral spacing with the Brillouin frequency shift. It also allows us to use a small cavity, and hence, our system has the potential to achieve the lasing threshold at a very low power.

Original languageEnglish
Article number201105
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 2018 May 14

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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