Laser cavity-soliton microcombs

Hualong Bao, Andrew Cooper, Maxwell Rowley, Luigi Di Lauro, Juan Sebastian Totero Gongora, Sai T. Chu, Brent E. Little, Gian-Luca Oppo, Roberto Morandotti, David J. Moss, Benjamin Wetzel, Marco Peccianti, Alessia Pasquazi

Research output: Contribution to journalLetterpeer-review

161 Citations (Scopus)
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Microcavity-based frequency combs, or ‘microcombs’ have enabled many fundamental breakthroughs through the discovery of temporal cavity-solitons. These self-localized waves, described by the Lugiato–Lefever equation, are sustained by a background of radiation usually containing 95% of the total power. Simple methods for their efficient generation and control are currently being investigated to finally establish microcombs as out-of-the-lab tools. Here, we demonstrate microcomb laser cavity-solitons. Laser cavity-solitons are intrinsically background-free and have underpinned key breakthroughs in semiconductor lasers. By merging their properties with the physics of multimode systems, we provide a new paradigm for soliton generation and control in microcavities. We demonstrate 50-nm-wide bright soliton combs induced at average powers more than one order of magnitude lower than the Lugiato–Lefever soliton power threshold, measuring a mode efficiency of 75% versus the theoretical limit of 5% for bright Lugiato–Lefever solitons. Finally, we can tune the repetition rate by well over a megahertz without any active feedback.
Original languageEnglish
Pages (from-to)384-389
Number of pages6
JournalNature Photonics
Issue number6
Early online date11 Mar 2019
Publication statusPublished - 1 Jun 2019


  • microcavity-based frequency combs
  • microcombs
  • Lugiato–Lefever equation
  • semiconductor lasers
  • microcomb laser cavity-solitons


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