Optical frequency synthesis and measurement using fibre-based femtosecond lasers

Topical issue: Metrology and optical frequency combs
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Abstract.

We report the synthesis and measurement of an ultra-precise and extremely stable optical frequency in the telecommunications window around 1543 nm. Using a fibre-based femtosecond frequency comb we have phase-stabilised a fibre laser at 194 THz to an optical frequency standard at 344 THz, thus transferring the properties of the optical frequency standard to another spectral region. Relative to the optical frequency standard, the synthesised frequency at 194 THz is determined to within 1 mHz and its fractional frequency instability is measured to be less than 2×10-15 at 1 s, reaching 5× 10-18 after 8000 s. We also measured the synthesised frequency against a caesium fountain clock: here the frequency comparison itself contributes less than 4 mHz (2×10-17) to the uncertainty. Our results confirm the suitability of fibre based frequency comb technology for precision measurements and frequency synthesis, and enable long-distance comparison of optical clocks by using optical fibres to transmit the frequency information.

PACS.

06.30.Ft Time and frequency 42.55.Wd Fibre lasers 42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy  

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Physikalisch-Technische Bundesanstalt, Bundesallee 100BraunschweigGermany

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