Stabilization of femtosecond laser frequency combs with subhertz residual linewidths

We demonstrate that femtosecond laser frequency combs (FLFCs) can have a subhertz linewidth across their entire emission spectra when they are phase locked to a reference laser with a similarly narrow linewidth. Correspondingly, the coherence time of the comb components relative to the reference las...

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Bibliographic Details
Published in:Optics letters 2004-05, Vol.29 (10), p.1081-1083
Main Authors: Bartels, A, Oates, C W, Hollberg, L, Diddams, S A
Format: Article
Language:English
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Summary:We demonstrate that femtosecond laser frequency combs (FLFCs) can have a subhertz linewidth across their entire emission spectra when they are phase locked to a reference laser with a similarly narrow linewidth. Correspondingly, the coherence time of the comb components relative to the reference laser can be of the order of a few seconds. Thus we are able to detect high-contrast spectral interferograms at up to 10-s integration time between two FLFCs locked to a common optical reference.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.29.001081