Self-locked broadband Raman-electro-optic microcomb

Shuai Wan, Pi-Yu Wang, Ming Li, Rui Ma, Rui Niu, Fang-Wen Sun, Fang Bo (), Guang-Can Guo and Chun-Hua Dong ()
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Shuai Wan: University of Science and Technology of China
Pi-Yu Wang: University of Science and Technology of China
Ming Li: University of Science and Technology of China
Rui Ma: Nankai University
Rui Niu: University of Science and Technology of China
Fang-Wen Sun: University of Science and Technology of China
Fang Bo: Nankai University
Guang-Can Guo: University of Science and Technology of China
Chun-Hua Dong: University of Science and Technology of China

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Optical frequency combs (OFCs), composed of equally spaced frequency lines, are essential for communications, spectroscopy, precision measurement, and fundamental physics research. Recent developments in integrated photonics have advanced chip-scale OFCs, enabling on-chip OFC generation via the Kerr or electro-optic (EO) effect. However, these nonlinear processes can occur simultaneously and are often accompanied by parasitic effects, like Raman scattering, which may impede broadband and low-noise microcomb generation. Here, we harness these interactions to demonstrate a novel OFC, the self-locked Raman-electro-optic (REO) microcomb in a lithium niobate microresonator. By leveraging the collaboration of EO, Kerr and Raman scattering, the REO microcomb spans over 300 nm (~1400 lines) with a 26.03 GHz repetition rate, achieving low-noise operation without external feedback. Our approach points to a direction for improving the performance of microcombs and paves the way for exploring new nonlinear physics, such as new laser locking techniques, through the multi-nonlinear synergy.

Date: 2025
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DOI: 10.1038/s41467-025-60161-1

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