title: Impact of spectral phase mismatch on femtosecond coherent beam combining systems.
abstract: We experimentally investigate the impact of spectral phase mismatch on the coherent beam combining of two femtosecond fiber chirped-pulse amplifiers. By measuring the differential spectral phase, both linear and nonlinear contributions are identified. An accumulated nonlinear phase as high as 6 rad has been measured, for which a combination efficiency of 91% can be obtained by symmetrizing the pump and injection powers. This also allows us to quantitatively separate the spatial and temporal contributions of the nonperfect combining efficiency.
authors.affiliation: Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris Sud, Palaiseau, France. louis.daniault@institutoptique.fr
authors.forename: L
authors.initials: L
authors.lastname: Daniault
authors.forename: M
authors.initials: M
authors.lastname: Hanna
authors.forename: L
authors.initials: L
authors.lastname: Lombard
authors.forename: Y
authors.initials: Y
authors.lastname: Zaouter
authors.forename: E
authors.initials: E
authors.lastname: Mottay
authors.forename: D
authors.initials: D
authors.lastname: Goular
authors.forename: P
authors.initials: P
authors.lastname: Bourdon
authors.forename: F
authors.initials: F
authors.lastname: Druon
authors.forename: P
authors.initials: P
authors.lastname: Georges