Abstract

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.

© 2004 Optical Society of America

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, and M. M. Fejer
Opt. Lett. 31(20) 3046-3048 (2006)

Subhertz-linewidth Nd:YAG laser

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Frequency comb linewidth of an actively mode-locked fiber laser

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K. Kim, S. A. Diddams, P. S. Westbrook, J. W. Nicholson, and K. S. Feder
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Absolute-frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

K. L. Corwin, I. Thomann, T. Dennis, R. W. Fox, W. Swann, E. A. Curtis, C. W. Oates, G. Wilpers, A. Bartels, S. L. Gilbert, L. Hollberg, N. R. Newbury, S. A. Diddams, J. W. Nicholson, and M. F. Yan
Opt. Lett. 29(4) 397-399 (2004)