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Opt Lett. 2012 Feb 15;37(4):650-2. doi: 10.1364/OL.37.000650.

Impact of spectral phase mismatch on femtosecond coherent beam combining systems.

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  • 1Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris Sud, Palaiseau, France.


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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