Year: 2025
Type: preprint
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 $τ_s$ is shorter than the Raman response timescale. The theory predicts a reduced dependence of the SSFS on $τ_s$ 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.
Source: arXiv (Cornell University)
Authors: Nie, Binbin, Wang, Yuanlei, Qian, Du, Yang, Yiwen, Luo, Haoyang, Wang, Junqi, Xiao, Yun-Feng, Gong, Qihuang, Yang, Qi-Fan
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4416023784
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