Fiber-laser frequency combs with subhertz relative linewidths

W. C. Swann, J. J. McFerran, I. Coddington, N. R. Newbury, I. Hartl, M. E. Fermann, P. S. Westbrook, J. W. Nicholson, K. S. Feder, C. Langrock, M. M. Fejer

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)


We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring the heterodyne beat signal between two independent frequency combs that are phase locked to a common cw optical reference. We demonstrate that the optical comb lines can exhibit instrument-limited, subhertz relative linewidths across the comb spectra from 1200 to 1720 nm with a residual integrated optical phase jitter of ~1 rad in a 60 mHz to 500 kHz bandwidth. The projected relative pulse timing jitter is ~1 fs. This performance approaches that of Ti:sapphire frequency combs.

Original languageEnglish
Pages (from-to)3046-3048
Number of pages3
JournalOptics Letters
Issue number20
Publication statusPublished - 15 Oct 2006
Externally publishedYes


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