Optical frequency combs: Coherently uniting the electromagnetic spectrum

Science
S A DiddamsT Udem

Abstract

Optical frequency combs were introduced around 20 years ago as a laser technology that could synthesize and count the ultrafast rate of the oscillating cycles of light. Functioning in a manner analogous to a clockwork of gears, the frequency comb phase-coherently upconverts a radio frequency signal by a factor of [Formula: see text] to provide a vast array of evenly spaced optical frequencies, which is the comb for which the device is named. It also divides an optical frequency down to a radio frequency, or translates its phase to any other optical frequency across hundreds of terahertz of bandwidth. We review the historical backdrop against which this powerful tool for coherently uniting the electromagnetic spectrum developed. Advances in frequency comb functionality, physical implementation, and application are also described.

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Citations

Dec 29, 2020·Light, Science & Applications·Heming WangKerry Vahala
Mar 5, 2021·Nature Communications·Valentino PistoreSukhdeep S Dhillon
May 13, 2021·Light, Science & Applications·Sutapa GhoshIdo Kaminer
May 28, 2021·Nature Communications·Zhizhou LuWenfu Zhang
Jul 3, 2021·Science·Chao XiangJohn E Bowers
Aug 31, 2021·Physical Review Letters·Laura MercadéEwold Verhagen
Oct 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Qizhong LiangJutta Toscano

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