In this paper we study the pulse quality degradation of an Ytterbium-based fiber laser in which B-integral ranges from 5 to 20 rad. A tunable chirped-fiber-Bragg-grating stretcher is optimized in term of reflectivity and phase profiles thank to a multivariable optimization algorithm. Parabolic and Sech2 spectral profiles are both studied in order to evaluate their robustness to non-linear degradation. Phase and reflectivity optimization can provide insight to design tailored specific pulse stretchers for CPA systems.
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