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Optical frequency combs based on mode-locked laser sources have provided unprecedented measurement capabilities for optical frequencies, enabling new applications in a wide range of topics that include atomic clocks, ultracold gases, molecular fingerprinting, microwave photonics, and astronomy. In recent years a new optical frequency comb generation principle has emerged, that does not rely on conventional mode-locked lasers but instead uses parametric frequency conversion in high-Q microresonators. This approach not only offers compactness and chip-scale integration, but moreover provides direct access to high repetition rates in the range of 10-1000 GHz. Here we review this emerging technology, which yields opportunities for novel technologies as well as for fundamental science.
Diddams, S.
and Klippenberg, T.
(2011),
Microresonator based optical frequency combs, Science Magazine, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906925
(Accessed September 10, 2024)