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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CG_3

Wavefront correction and aberrations pre-compensation in the middle of Petawatt-class CPA laser chains

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Abstract

Wavefront correction in high intensity laser chains is a bottleneck on the way to highest intensities. Wavefront correction of the laser beam is of fundamental importance in modern high intensity laser for two reasons: to optimize the experimental focal spot, so to obtain the maximum intensity for laser-matter interaction [1], [2], and to address the problem of damage of optical components by spatial modulations and hot-spots. Recent works [1] demonstrated that is possible, by using a deformable mirror to correct aberrations at the end of the amplification chain, to obtain an improvement of the Strehl Ratio up to 90%. The problem of damage of optical components by spatial modulations and hot spot, especially in chirped pulse amplification laser chain, is usually underestimated, due to the difficulty of correlating the damages induced on the optical surfaces to the beam modulations. A new approach of the problem of damage in CPA laser chain, based on the analysis of temporal and above all spatial modulations of the stretched beam [3], enhances the importance of the evolution of the phase residues of the deformable mirror, responsible of hot spots formation.

© 2007 IEEE

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