%0 Journal Article %T Observation of high-contrast coherence fringes in high-order harmonic generation %+ Laboratoire d'optique appliquée (LOA) %A Kazamias, Sophie %A Douillet, D. %A Valentin, C. %A Weihe, F. %A Auge-Rochereau, Frederika %A Lefrou, Thierry %A Grillon, G. %A Sebban, Stéphane %A Balcou, Philippe %< avec comité de lecture %@ 1050-2947 %J Physical Review A : Atomic, molecular, and optical physics [1990-2015] %I American Physical Society %V 68 %N 3 %P 033819 %8 2003-09-29 %D 2003 %R 10.1103/PhysRevA.68.033819 %Z PACS 42.65.Ky; 32.80.Rm; 42.65.Re %Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles %X We present a direct measurement of the coherence length in the high-order-harmonic generation process up to orders as high as 25. The harmonic signal generated in an argon gas cell by a 805-nm, 6-mJ, 30-fs laser is studied as a function of medium length and shows very high-contrast coherence fringes. From a one-dimensional time-dependent model, we unravel the conditions for which such Maker fringes can appear in high-order harmonic generation. %G English %L hal-00522997 %U https://hal-polytechnique.archives-ouvertes.fr/hal-00522997 %~ X %~ ENSTA %~ CNRS %~ X-LOA %~ X-DEP %~ X-DEP-PHYS %~ PARISTECH %~ ENSTA_LOA