Cascading-Induced Fundamental Linewidth Enhancement of a Microcavity Brillouin Laser
Stimulated Brillouin scattering (SBS) in microresonators provides a simple way to achieve chip-scale narrow-linewidth lasers. While theoretical studies suggest that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser, this phenomenon has yet to be experimentally validated. In this work, we investigate the fundamental linewidth behaviors of the Brillouin lasers in both the non-cascaded and cascaded cases using an ultrahigh-Q factor microrod resonator. In the non-cascaded case, we achieve a Brillouin laser with a 188 mHz fundamental linewidth without using an erbium-doped fiber amplifier. In the cascaded case, we observe, for the first time, that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser. These findings highlight the importance of mitigating or avoiding the cascading effect to achieve the narrowest possible linewidths of Brillouin lasers.
Authors
- Daquan Yang (ORCID: https://orcid.org/0000-0003-1976-8821)
- Chengnian Liu
- Xin Hua Zhou (ORCID: https://orcid.org/0000-0002-5580-7907)
- Bei‐Bei Li (ORCID: https://orcid.org/0000-0002-9259-244X)
- Ze Wang (ORCID: https://orcid.org/0009-0009-4281-7557)
- Jincheng Li (ORCID: https://orcid.org/0000-0001-9803-3553)
- Min Wang (ORCID: https://orcid.org/0009-0007-1776-732X)
- Qi-Fan Yang (ORCID: https://orcid.org/0009-0002-8167-0630)
Institutions
- Beijing University of Posts and Telecommunications (CN)
- Chinese Academy of Sciences (CN)
- Peking University (CN)
- Songshan Lake Materials Laboratory (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Shanxi University of Traditional Chinese Medicine (CN)
- National Laboratory for Superconductivity (CN)
- University of Chinese Academy of Sciences (CN)
- Beihang University (CN)
Publication Details
- Journal
- ACS Photonics
- Published
- 2025-04-16
- DOI
- https://doi.org/10.1021/acsphotonics.5c00127
- Citations
- 4
- Primary Topic
- Advanced Fiber Laser Technologies
- Type
- article
- Field-Weighted Citation Impact
- 4.99
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Ministry of Science and Technology of the People's Republic of China
- National Key Research and Development Program of China