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- Title
Widely-tunable, multi-band Raman laser based on dispersion-managed thin-film lithium niobate microring resonators.
- Authors
Zhao, Yanjing; Liu, Xiaoyue; Yvind, Kresten; Cai, Xinlun; Pu, Minhao
- Abstract
Stimulated Raman scattering is an attractive way to extend the operation spectral range of optical sources. However, the spectral extension range of a tunable Raman laser is limited by the Raman frequency shift and pump tuning bandwidth. This makes it challenging to realize chip-scale, widely tunable Raman lasers, as on-chip lasers only provide limited pump power and tuning bandwidth. Here, we tackle this by dispersion engineering of a thin-film lithium niobate microring resonator, where its high-quality factor (~ 2.5 million) ensures a sub-milli-watt (0.8 mW) threshold for Raman lasing while its strong normal dispersion with suppressed avoided mode crossing restrains the competing Kerr comb generation process. Combining the multi-wavelength Raman gain response of lithium niobate and cascaded Raman lasing, we demonstrate a widely tunable Raman laser covering 1592–1955 nm, showing a 335-nm spectral extension range from a 94-nm-tuning-bandwidth pump laser. Our demonstration paves the way to realize chip-scale, widely-tunable Raman lasers. Extending the spectral range of on-chip tunable Raman laser is challenging due to the limited Raman frequency shifts and pump tuning bandwidth. The authors combine the dispersion engineering of thin film lithium niobate with cascaded Raman lasing to realize a widely tunable laser with 335-nm spectral extension and sub-milliwatt threshold.
- Subjects
TUNABLE lasers; LITHIUM niobate; RESONATORS; LIGHT sources; STIMULATED Raman scattering; RAMAN lasers; LASER pumping; SUPERCONTINUUM generation
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01477-6