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Chaos-assisted two-octave-spanning microcombs.

Hao-Jing Chen1, Qing-Xin Ji1,2,3, Heming Wang3

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This summary is machine-generated.

Researchers developed a broadband microcomb using a deformed silica microcavity, achieving over two-octave spectral coverage for applications in optical clocks and imaging.

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Area of Science:

  • Photonics and Optical Engineering
  • Nonlinear Optics
  • Microcavity Devices

Background:

  • Optical frequency combs (OFCs) have transformed metrology and spectroscopy.
  • Microresonator-based frequency combs (microcombs) offer chip-scale OFC systems.
  • Broad spectral coverage is crucial for integrated microcomb applications.

Purpose of the Study:

  • To demonstrate microcombs with ultra-broad spectral coverage.
  • To explore the role of cavity deformation in microcomb generation.
  • To enable new applications in optical clocks, astronomical calibration, and biological imaging.

Main Methods:

  • Utilized coupled χ(2) and χ(3) nonlinearities in a deformed silica microcavity.
  • Engineered cavity deformation to break circular symmetry.
  • Employed a single waveguide for broadband intracavity emission collection.

Main Results:

  • Achieved over two-octave spectral span (450 nm to 2,008 nm).
  • Demonstrated broadband spectral collection via chaotic tunneling channels.
  • Introduced cavity deformation as a new design parameter for microcombs.

Conclusions:

  • Deformed microcavities enable ultra-broadband microcombs.
  • This approach enhances microcomb utility for diverse scientific fields.
  • Cavity deformation provides a novel pathway for microcomb engineering.