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Related Experiment Video

Updated: Feb 19, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Published on: December 15, 2021

Towards visible soliton microcomb generation.

Seung Hoon Lee¹, Dong Yoon Oh¹, Qi-Fan Yang¹

¹T. J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA, 91125, USA.

Nature Communications

|November 5, 2017

Summary

This summary is machine-generated.

Researchers developed short-wavelength soliton microcombs for miniature optical clocks. These devices, operating near the visible spectrum edge, expand the spectral reach of microcomb technology.

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Area of Science:

Photonics and Optical Engineering
Quantum Optics
Materials Science

Background:

Frequency combs are crucial for applications spanning the ultraviolet to mid-infrared spectrum.
Microcombs, miniaturized devices, offer potential for broad spectral access but are currently limited in reach.
Expanding microcomb spectral coverage is essential for their wider adoption in various applications.

Purpose of the Study:

To demonstrate mode-locked silica microcombs emitting at the edge of the visible spectrum.
To engineer microcombs for soliton generation with high optical Q factors.
To achieve low-power, electronics-bandwidth-compatible soliton mode locking.

Main Methods:

Utilized geometrical and mode-hybridization dispersion control for device engineering.
Fabricated silica microcombs designed for soliton generation.
Employed low pumping powers to achieve soliton mode locking at 20 GHz bandwidth.

Main Results:

Demonstrated mode-locked silica microcombs with emission near the visible spectrum edge.
Achieved high optical Q factors up to 80 million.
Obtained electronics-bandwidth-compatible soliton mode locking with low parametric oscillation threshold powers (as low as 5.4 mW).

Conclusions:

These represent the shortest wavelength soliton microcombs demonstrated to date.
The developed microcombs are suitable for miniature optical clock applications.
The findings suggest potential for extending microcomb technology to visible and ultraviolet bands.