@article{7f41261d373d446c83520b4251f189f5,
title = "Table-top femtosecond soft X-ray laser by collisional ionization gating",
abstract = "The advent of X-ray free-electron lasers has granted researchers an unprecedented access to the ultrafast dynamics of matter on the nanometre scale(1-3). Aside from being compact, seeded plasma-based soft X-ray lasers (SXRLs) turn out to be enticing as photon-rich(4) sources (up to 10(15) per pulse) that display high-quality optical properties(5,6). Hitherto, the duration of these sources was limited to the picosecond range(7), which consequently restricts the field of applications. This bottleneck was overcome by gating the gain through ultrafast collisional ionization in a high-density plasma generated by an ultraintense infrared pulse (a few 10(18) W cm(-2)) guided in an optically pre-formed plasma waveguide. For electron densities that ranged from 3 x 10(18) cm(-3) to 1.2 x 10(20) cm(-3), the gain duration was measured to drop from 7 ps to an unprecedented value of about 450 fs, which paves the way to compact and ultrafast SXRL beams with performances previously only accessible in large-scale facilities.",
author = "A. Depresseux and E. Oliva and J. Gautier and F. Tissandier and J. Nejdl and M. Kozlova and G. Maynard and Goddet, {J. P.} and A. Tafzi and A. Lifschitz and Kim, {H. T.} and S. Jacquemot and V. Malka and Phuoc, {K. Ta} and C. Thaury and P. Rousseau and G. Iaquaniello and T. Lefrou and A. Flacco and B. Vodungbo and G. Lambert and A. Rousse and P. Zeitoun and S. Sebban",
note = "We thank J. L. Charles for his technical support. This work was backed by the Agence Nationale de la Recherche through projects ROLEX ANR-06-BLAN-04 023 01 and ANR-10-EQPX-25, and by the European Research Council through the X-five project (Contract No. 339128). We acknowledge funding from project ECOP (Grant No. CZ.1.07/2.3.00/20.0279 and No. CZ.1.07/2.3.00/30.005) and ANR-11-IDEX-0003-02. H.T.K. was supported by the Institute for Basic Science (IBS-CA1306). Finally, we also thank SourceLAB for its contribution to the development of the high-density gas-jet system. S.S. proposed the experiment. S.S., J.G, F.T. and A.D. designed and built the set-up. G.M. developed the code OFI-0D. E.O., G.M. and A.L. performed the numerical simulations. J.P.G. and A.T. designed, built and operated the upgraded laser system of {\textquoteleft}Salle Jaune{\textquoteright}. K.T.P., C.T. and P.R. provided support for the operation of the facilities. A.F. developed a phase reconstruction and Abel inversion software for the electron-density diagnostic. All the authors contributed to the data analysis and the writing of the paper. P.Z., S.J., V.M. and A.R. supported the project.",
year = "2015",
month = dec,
doi = "10.1038/NPHOTON.2015.225",
language = "الإنجليزيّة",
volume = "9",
pages = "817--821",
journal = "Nature Photonics",
issn = "1749-4885",
publisher = "Nature Publishing Group",
}