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arXiv · 2511.04013

Raman-induced dynamics of ultrafast microresonator solitons

Binbin Nie·Yuanlei Wang·Du Qian·Yiwen Yang·Haoyang Luo·Junqi Wang·Yun-Feng Xiao·Qihuang Gong·Qi-Fan Yang
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Abstract

Soliton microcombs are evolving towards octave-spanning for $f$-$2f$ self-referencing and expanding applications in spectroscopy and timekeeping. As spectra broaden and pulses shorten, the Raman-induced soliton self-frequency shift (SSFS) becomes a principal limitation: it reduces pump-to-comb conversion efficiency, constrains achievable span, and can, in extremes, preclude stationary operation. We develop a complementary theory of SSFS in microresonators that remains valid when the soliton duration $\tau_s$ is shorter than the Raman response timescale. The theory predicts a reduced dependence of the SSFS on $\tau_s$ which also expands the soliton existence range. Such predictions are validated by numerical simulations and by experiments on Si$_3$N$_4$ microresonators. Our results provide practical guidelines for engineering efficient and broadband soliton microcombs.

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Binbin Nie, Yuanlei Wang, Du Qian, Yiwen Yang, Haoyang Luo, Junqi Wang, Yun-Feng Xiao, Qihuang Gong, Qi-Fan Yang. 2025-11-06. Raman-induced dynamics of ultrafast microresonator solitons. https://arxiv.org/abs/2511.04013

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