Raman-assisted high-efficiency soliton microcombs in a SiO2 microsphere.

IF 3.3 2区 物理与天体物理 Q2 OPTICS
Optics letters Pub Date : 2025-10-01 DOI:10.1364/OL.571618
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.

SiO2微球中拉曼辅助的高效孤子微梳。
在高q微谐振器中产生的孤子微梳已经彻底改变了集成光子技术,如光学时钟、光谱学和电信。然而,传统的泵浦方案存在泵-孤子转换效率低、功率阈值高的问题。此外,受激拉曼散射(SRS)等寄生非线性过程也会影响孤子态的产生和稳定。本文利用高q SiO2微球中SRS和四波混频(FWM)的协同作用,实现了一种低功率阈值的高效孤子微梳。双泵浦策略(主泵浦触发拉曼增益,次泵浦启动孤子微梳形成)使泵浦激光到孤子态的转换效率达到21.8%。实验结果表明,二次泵浦的引入可以使拉曼孤子微梳的中心频率在拉曼增益范围内进行调谐。这种方法不仅降低了孤子形成阈值,而且通过动态拉曼增益补偿和热抑制实现了强大的孤子稳定。我们的工作为在拉曼有源微谐振器中实现高能效非线性光子学提供了一条通用途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Optics letters
Optics letters 物理-光学
CiteScore
6.60
自引率
8.30%
发文量
2275
审稿时长
1.7 months
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.
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