Impact of spectral phase mismatch on femtosecond coherent beam combining systems |
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Authors: | Daniault L Hanna M Lombard L Zaouter Y Mottay E Goular D Bourdon P Druon F Georges P |
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Affiliation: | Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris Sud, Palaiseau, France. louis.daniault@institutoptique.fr |
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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. |
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