Highly efficient nonlinear filter for femtosecond pulse contrast enhancement and pulse shortening.

  title={Highly efficient nonlinear filter for femtosecond pulse contrast enhancement and pulse shortening.},
  author={Aur{\'e}lie Jullien and J. P. Rousseau and Brigitte Mercier and Laura Antonucci and Olivier Albert and Gilles Ch{\'e}riaux and S. Kourtev and Nikolai I. Minkovski and Solomon M. Saltiel},
  journal={Optics letters},
  volume={33 20},
We propose a highly efficient scheme for temporal filters devoted to femtosecond pulse contrast enhancement. The filter is based on cross-polarized wave generation with a spatially suger-Gaussian-shaped beam. In a single nonlinear crystal scheme the energy conversion to the cross-polarized pulse can reach 28%. We demonstrate that the process enables a significant spectral broadening. For an efficiency of 23% the pulse shortening is estimated to 2.2, leading to an intensity transmission of the… 

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