title: First international comparison of femtosecond laser combs at the International Bureau of Weights and Measures.
abstract: The first international comparison of femtosecond laser combs has been carried out at the International Bureau of Weights and Measures (BIPM). Three comb systems were involved: BIPM-C1 and BIPM-C2 from the BIPM and ECNU-C1 from the East China Normal University (ECNU). The agreement among the three combs was found to be on the subhertz level in the vicinity of 563 THz. A frequency difference measurement scheme was demonstrated that is suitable for general comb comparisons.
authors.affiliation: Bureau International des Poids et Mesures, Pavilion de Breteuil, F-92312, Sèvres Cedex, France. lsmaecnu@yahoo.com.cn
authors.forename: Long-Sheng
authors.initials: LS
authors.lastname: Ma
authors.forename: Lennart
authors.initials: L
authors.lastname: Robertsson
authors.forename: Susanne
authors.initials: S
authors.lastname: Picard
authors.forename: Massimo
authors.initials: M
authors.lastname: Zucco
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Bi
authors.forename: Shenghai
authors.initials: S
authors.lastname: Wu
authors.forename: Robert S
authors.initials: RS
authors.lastname: Windeler