%0 Journal Article %T ASE contrast improvement with a non-linear filtering Sagnac interferometer %+ Laboratoire d'optique appliquée (LOA) %+ Amplitude Technologies %+ Centre d'Etudes de Saclay %A Renault, Amandine %A Auge-Rochereau, Frederika %A Planchon, Thomas %A d'Oliveira, Pascal %A Auguste, Thierry %A Cheriaux, Gilles %A Chambaret, Jean-Paul %< avec comité de lecture %@ 0030-4018 %J Optics Communications %I Elsevier %V 248 %N 4-6 %P 535-541 %8 2005 %D 2005 %R 10.1016/j.optcom.2004.12.038 %K Ultrashort pulses %K Contrast %K Non-linear filter %K Sagnac interferometer %Z PACS 42.60.By; 42.62; 42.65.Re; 42.65.-k; 07.60.L %Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles %X A new method to improve the temporal contrast of an ultra-short laser pulse has been developed. This technique uses a Sagnac interferometer in combination with a non-linear medium. A phase shift induced in the ultra-short pulse by non-linear effect separates it from the amplified spontaneous emission background. Experiments with a 1 kHz, 55 fs, 1 mJ Ti:Sa laser were performed. The temporal contrast measurements have shown a contrast improvement of four orders of magnitude. %G English %L hal-00526452 %U https://polytechnique.hal.science/hal-00526452 %~ CEA %~ X %~ ENSTA %~ CNRS %~ X-LOA %~ X-DEP %~ X-DEP-PHYS %~ PARISTECH %~ ENSTA_LOA