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Opt Lett. 2008 Oct 15;33(20):2353-5.

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

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Laboratoire d'Optique Appliquée, Ecole Nationale Supérieure des Techniques Avancées (ENSTA) PariTech, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau Cedex, France.


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 nonlinear filter of 50%.

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