title: Stabilization of femtosecond laser frequency combs with subhertz residual linewidths.
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.
authors.affiliation: Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. albrecht@boulder.nist.gov
authors.forename: A
authors.initials: A
authors.lastname: Bartels
authors.forename: C W
authors.initials: CW
authors.lastname: Oates
authors.forename: L
authors.initials: L
authors.lastname: Hollberg
authors.forename: S A
authors.initials: SA
authors.lastname: Diddams