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Updated: Jun 28, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Highly efficient nonlinear filter for femtosecond pulse contrast enhancement and pulse shortening
Aurélie Jullien1, Jean-Philippe Rousseau, Brigitte Mercier
1Laboratoire d'Optique Appliquée, Ecole Nationale Supérieure des Techniques Avancées (ENSTA) PariTech, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau Cedex, France. Aurelie.Jullien@ensta.fr
Abstract:
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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