Details

Autor(en) / Beteiligte

• Zhang, Pei-Ji
• Ji, Qing-Xin
• Cao, Qi-Tao
• Wang, Heming
• Liu, Wenjing
• Gong, Qihuang
• Xiao, Yun-Feng

Titel

Single-mode characteristic of a supermode microcavity Raman laser

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2021-06, Vol.118 (22), p.1

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Microlasers in near-degenerate supermodes lay the cornerstone for studies of non-Hermitian physics, novel light sources, and advanced sensors. Recent experiments of the stimulated scattering in supermode microcavities reported beating phenomena, interpreted as dual-mode lasing, which, however, contradicts their single-mode nature due to the clamped pump field. Here, we investigate the supermode Raman laser in a whispering-gallery microcavity and demonstrate experimentally its single-mode lasing behavior with a side-mode suppression ratio (SMSR) up to 37 dB, despite the emergence of near-degenerate supermodes by the backscattering between counterpropagating waves. Moreover, the beating signal is recognized as the transient interference during the switching process between the two supermode lasers. Self-injection is exploited to manipulate the lasing supermodes, where the SMSR is further improved by 15 dB and the laser linewidth is below 100 Hz.