Comparing Optical Oscillators across the Air to Milliradians in Phase and 10^{-17} in Frequency

Physical Review Letters
L C SinclairN R Newbury

Abstract

We demonstrate carrier-phase optical two-way time-frequency transfer (carrier-phase OTWTFT) through the two-way exchange of frequency comb pulses. Carrier-phase OTWTFT achieves frequency comparisons with a residual instability of 1.2×10^{-17} at 1 s across a turbulent 4-km free space link, surpassing previous OTWTFT by 10-20 times and enabling future high-precision optical clock networks. Furthermore, by exploiting the carrier phase, this approach is able to continuously track changes in the relative optical phase of distant optical oscillators to 9 mrad (7 as) at 1 s averaging, effectively extending optical phase coherence over a broad spatial network for applications such as correlated spectroscopy between distant atomic clocks.

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Oct 15, 2016·Applied Physics Letters·Laura C SinclairNathan R Newbury
Jan 13, 2017·Light, Science & Applications·Ming XinFranz X Kärtner

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Citations

Oct 2, 2019·Nature Communications·Hyun Jay KangSeung-Woo Kim
Aug 6, 2020·The Review of Scientific Instruments·Dong HouGuangkun Guo
Apr 20, 2019·Nature Communications·Hugo BergeronNathan R Newbury
Jan 24, 2021·Nature Communications·Benjamin P Dix-MatthewsPeter Wolf
Jan 1, 2021·Optics Express·Honglei YangJun Ge
Mar 26, 2021·Nature·UNKNOWN Boulder Atomic Clock Optical Network (BACON) Collaboration*

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