Jin Li, Rui Niu, Shuai Wan, Ming Li, Fang-Wen Sun, Guang-Can Guo, Chun-Hua Dong
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引用次数: 0
Abstract
Soliton microcombs, generated in high-Q microresonators, have revolutionized integrated photonic technologies such as optical clocks, spectroscopy, and telecommunications. However, conventional pump schemes suffer from low pump-to-soliton conversion efficiency and high power threshold. Besides, parasitic nonlinear processes such as stimulated Raman scattering (SRS) may also affect the generation and stabilization of soliton states. Here, we realize a high-efficiency soliton microcomb with a low power threshold by exploiting the synergistic interplay between SRS and four-wave mixing (FWM) in a high-Q SiO2 microsphere. A dual-pump strategy-where a primary pump triggers the Raman gain and a secondary pump initiates soliton microcomb formation-enables 21.8% conversion efficiency from the pump laser to the soliton state. Experimental evidence reveals that the introduction of the secondary pump allows the tuning of the center frequency of the Raman soliton microcomb within the Raman gain region. This approach not only reduces the soliton formation threshold but also enables robust soliton stabilization via dynamic Raman gain compensation and thermal suppression. Our work provides a universal pathway for energy-efficient nonlinear photonics in Raman-active microresonators.
期刊介绍:
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.