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Spatio-temporal pulse cleaning in multi-pass cells

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posted on 2023-03-02, 17:01 authored by Jaismeen Kaur, Louis Daniault, Zhao Cheng, Oscar Tourneur, Olivier Tcherbakoff, Fabrice Réau, Jean-François Hergott, Rodrigo Lopez-Martens
We study both numerically and experimentally the use of two third-order nonlinear temporal filtering techniques, namely nonlinear ellipse rotation (NER) and cross-polarized wave (XPW) generation, for spatio-temporal cleaning of mJ energy 30 fs Titanium:Sapphire laser pulses in a multi-pass cell. In both cases, a contrast enhancement greater than 3 orders of magnitude is observed, together with excellent output pulse quality and record high conversion efficiencies. Careful balancing of nonlinearity and dispersion inside the multi-pass cell helps tune the spectral broadening process and control the post-compressed pulse duration for specific applications.



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