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Related Experiment Video

Updated: Sep 20, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Optical linewidth of soliton microcombs.

Fuchuan Lei1, Zhichao Ye1, Óskar B Helgason1

  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296, Gothenburg, Sweden.

Nature Communications
|June 7, 2022
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Summary

Soliton microcombs show narrower linewidths than the pump laser due to Raman self-frequency shift or dispersive-wave recoil. This finding advances phase coherence in microcombs for applications like precision metrology.

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Area of Science:

  • Photonics
  • Quantum Optics
  • Materials Science

Background:

  • Soliton microcombs are crucial for precision metrology and fundamental studies.
  • Broadband phase coherence, defined by optical phase noise and linewidths, is essential for frequency ruler applications.
  • Silicon nitride microresonators offer high quality factors (high-Q) for microcomb generation.

Purpose of the Study:

  • To analyze optical phase-noise dynamics in silicon nitride soliton microcombs.
  • To investigate the physical limits of phase coherence in these systems.
  • To demonstrate a novel on-chip strategy for generating spectrally coherent light.

Main Methods:

  • Generation of soliton microcombs in silicon nitride high-Q microresonators.
  • Analysis of optical phase-noise dynamics.
  • Characterization of comb line optical linewidths and comparison with the pump laser.

Main Results:

  • Observed that specific comb lines exhibit Lorentzian linewidths narrower than the pump laser.
  • Attributed this phenomenon to the Raman self-frequency shift or dispersive-wave recoil.
  • Elucidated the underlying physical mechanisms governing phase coherence.

Conclusions:

  • The study reveals surprising linewidth narrowing in soliton microcomb lines.
  • This work provides insights into the physical limits of phase coherence in microcombs.
  • A new on-chip strategy for generating spectrally coherent light has been illustrated.