Focus 

Microresonator Frequency Combs: New Horizons

Frequency combs are the precise frequency rulers for optical spectra that have enabled precision optical metrology and ultrashort pulse synthesis and are contributing to research advancement over a wide range of disciplines. 

Since the more recent discovery of the Kerr frequency combs in microresonators, there has been a rapid development of microresonator-based frequency comb technology serving diverse applications. Microresonator combs and frequency converters are now broadly used and researched in metrology, optical clocks, quantum engineering, spectroscopy, astronomy, microwave synthesis, soliton photonics and communications.

This Focus Collection aims to highlight the latest developments and novel trends in microresonator frequency conversion and frequency comb generation.

Schematic of an optical frequency comb spectrum

Published articles