title: Demonstration of a Ni-like Kr optical-field-ionization collisional soft x-ray laser at 32.8 nm.
abstract: 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(9)4d 1S0-3d(9)4p(1)P1 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.
authors.affiliation: Laboratoire d'Optique Appliquée, CNRS UMR 7639, F-91761 Palaiseau cedex, France.
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authors.lastname: Sebban
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authors.lastname: Ros
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authors.lastname: Carillon
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authors.lastname: Rousseau
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authors.lastname: Notebaert
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authors.lastname: Pittman
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authors.lastname: Hulin