Abstract

The Optical Frequency Comb (OFC) represents a cornerstone of precision metrology, because it provides a clockwork to down-convert hundreds of THz of optical frequency standards to the countable and traceable radio frequency (RF) domain. In particular, for a future redefinition of the Coordinated Universal Time by an optical atomic transition [1], it will be an essential ingredient. Nowadays, narrowband optical transitions show relative stability and accuracy on the level of 10−18 [2,3] and the comb has to keep pace in order not to add noise or instability. While there are schemes to mix out noise related to the comb by appropriate RF techniques, modern ultra-low noise frequency combs may advantageously be used with much reduced complexity.

© 2017 IEEE

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