Abstract

Mode-locked erbium-doped fiber lasers are ideal comb generators for optical frequency metrology. We compare two fiber frequency combs by measuring an optical frequency independently with both combs and comparing their results. The two frequency measurements agree within 6×10-16. This is to our knowledge the first direct comparison between two fiber based frequency combs.

© 2005 Optical Society of America

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References

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[CrossRef]

Nature

T. Udem, R. Holzwarth, and T. W. Hänsch, �??Optical frequency metrology,�?? Nature 416, 233�??237 (2002).
[CrossRef] [PubMed]

Opt. Commun.

J. Reichert, R. Holzwarth, T. Udem, and T. W. Hänsch, �??Measuring the frequency of light with mode-locked lasers,�?? Opt. Commun. 172, 59�??68 (1999).
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. Lett.

S. A. Diddams, D. J. Jones, J. Ye, S. T. Cundiff, J. L. Hall, J. K. Ranka, R. S. Windeler, R. Holzwarth, T. Udem, and T.W. Hänsch, �??Direct Link between Microwave and Optical Frequencies with a 300 THz Femtosecond Laser Comb,�?? Phys. Rev. Lett. 84, 5102�??5105 (2000).
[CrossRef] [PubMed]

R. Holzwarth, T. Udem, T. W. Hänsch, J. C. Knight, W. J. Wadsworth, and P. S. J. Russell, �??Optical Frequency Synthesizer for Precision Spectroscopy,�?? Phys. Rev. Lett. 85, 2264�??2267 (2000).
[CrossRef] [PubMed]

Rev. Mod. Phys.

S. T. Cundiff and J. Ye, �??Colloquium: Femtosecond optical frequency combs,�?? Rev. Mod. Phys. 75, 325�??342 (2003).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Experimental setup. rf-signals are denoted by blue lines and the letter f. Optical signals are denoted by red lines and the letter ν. Not shown in this figure: Frequency counters are referenced onto the rf-reference. ECDL: external cavity diode laser, SMF: single-mode fiber.

Fig. 2.
Fig. 2.

Upper plot: difference between the 1s frequency measurements of the cw fiber laser performed by the PTB and the MPQ fiber comb. Lower plot: the two independent frequency measurements.

Fig. 3.
Fig. 3.

Frequency difference of 1000s samples with linear fit.

Fig. 4.
Fig. 4.

Allan standard deviation of the independent measurements (PTB, MPQ) and the difference of the independent measurements (MPQ-PTB).

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