In this paper we describe the experimental validation of the technique of correction of wavefront aberration in the middle of the laser amplifying chain. This technique allows the correction of the aberrations from the first part of the laser system, and the pre-compensation of the aberrations built in the second part. This approach will allow an effective aberration management in the laser chain, to protect the optical surfaces and optimize performances, and is the only possible approach for multi-Petawatt laser system from the technical and economical point of view. This approach is now possible after the introduction of new deformable mirrors with lower static aberrations and higher dynamic than the standard devices.
We have simulated Chirped Pulse Amplification process with a new software, allowing to extend the generally used 1D-models. We show here the importance of the beam spatial discretization in simulations in order to describe the gain saturation. Experimental measurements performed on our 100 TW laser validate this calculation, allowing us to carefully design the next generation of Ti:sapphire lasers at the Petawatt level.