%0 Journal Article %T Demonstration of a Ni-Like Kr Optical-Field-Ionization Collisional Soft X-Ray Laser at 32.8 nm %+ Laboratoire d'optique appliquée (LOA) %+ Institute of Physics (PALS) %+ Laboratoire de Spectroscopie Atomique et Ionique %A Sebban, Stéphane %A Mocek, Tomas %A Ros, D. %A Upcraft, L. %A Balcou, Philippe %A Haroutunian, R. %A Grillon, G. %A Rus, Bedrich %A Klisnick, Annie %A Carillon, A. %A Jamelot, Gérard %A Valentin, Constance %A Rousse, Antoine %A Rousseau, Jean-Philippe %A Notebaert, L. %A Pittman, M. %A Hulin, D. %< avec comité de lecture %@ 0031-9007 %J Physical Review Letters %I American Physical Society %V 89 %N 25 %P 253901 %8 2002-11-27 %D 2002 %R 10.1103/PhysRevLett.89.253901 %Z PACS 42.55.Vc; 32.30.Rj; 52.50.Jm %Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles %X We report the first experimental demonstration of a Ni-like optical-field ionization collisional soft x-ray laser. The amplifying medium is generated by focusing a circularly polarized 760 mJ, 30 fs, 10-Hz Ti:sapphire laser beam in a few mm cell filled with krypton. We have measured a gain coefficient of 78  cm^-1 on the 3d^94d^1S0-3d^94p^1P1 transition at 32.8 nm, which is here amplified for the first time. This radiation source represents the shortest wavelength optical-field ionization collisional soft x-ray laser ever produced. The influence of the gas pressure and the pumping energy on the lasing output are also presented. %G English %L hal-00523166 %U https://hal-polytechnique.archives-ouvertes.fr/hal-00523166 %~ X %~ ENSTA %~ CNRS %~ UNIV-PSUD %~ X-LOA %~ X-DEP %~ X-DEP-PHYS %~ PARISTECH %~ ENSTA_LOA %~ UNIV-PARIS-SACLAY %~ UNIV-PSUD-SACLAY