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Ultraviolet surprise: Efficient soft x-ray high-harmonic generation in multiply ionized plasmas.
Popmintchev, Dimitar; Hernández-García, Carlos; Dollar, Franklin; Mancuso, Christopher; Pérez-Hernández, Jose A; Chen, Ming-Chang; Hankla, Amelia; Gao, Xiaohui; Shim, Bonggu; Gaeta, Alexander L; Tarazkar, Maryam; Romanov, Dmitri A; Levis, Robert J; Gaffney, Jim A; Foord, Mark; Libby, Stephen B; Jaron-Becker, Agnieszka; Becker, Andreas; Plaja, Luis; Murnane, Margaret M; Kapteyn, Henry C; Popmintchev, Tenio.
Afiliación
  • Popmintchev D; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Hernández-García C; JILA, University of Colorado, Boulder, CO 80309, USA. Grupo de Investigación en Óptica Extrema, Universidad de Salamanca, E-37008 Salamanca, Spain.
  • Dollar F; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Mancuso C; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Pérez-Hernández JA; Centro de Laseres Pulsados, E-37008 Salamanca, Spain.
  • Chen MC; Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan.
  • Hankla A; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Gao X; School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
  • Shim B; School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
  • Gaeta AL; School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
  • Tarazkar M; Department of Chemistry, Temple University, Philadelphia, PA 19122, USA.
  • Romanov DA; Department of Physics, Temple University, Philadelphia, PA 19122, USA.
  • Levis RJ; Department of Chemistry, Temple University, Philadelphia, PA 19122, USA.
  • Gaffney JA; Physics Division, Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
  • Foord M; Physics Division, Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
  • Libby SB; Physics Division, Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
  • Jaron-Becker A; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Becker A; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Plaja L; Grupo de Investigación en Óptica Extrema, Universidad de Salamanca, E-37008 Salamanca, Spain.
  • Murnane MM; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Kapteyn HC; JILA, University of Colorado, Boulder, CO 80309, USA.
  • Popmintchev T; JILA, University of Colorado, Boulder, CO 80309, USA. tenio.popmintchev@jila.colorado.edu.
Science ; 350(6265): 1225-31, 2015 Dec 04.
Article en En | MEDLINE | ID: mdl-26785483
High-harmonic generation is a universal response of matter to strong femtosecond laser fields, coherently upconverting light to much shorter wavelengths. Optimizing the conversion of laser light into soft x-rays typically demands a trade-off between two competing factors. Because of reduced quantum diffusion of the radiating electron wave function, the emission from each species is highest when a short-wavelength ultraviolet driving laser is used. However, phase matching--the constructive addition of x-ray waves from a large number of atoms--favors longer-wavelength mid-infrared lasers. We identified a regime of high-harmonic generation driven by 40-cycle ultraviolet lasers in waveguides that can generate bright beams in the soft x-ray region of the spectrum, up to photon energies of 280 electron volts. Surprisingly, the high ultraviolet refractive indices of both neutral atoms and ions enabled effective phase matching, even in a multiply ionized plasma. We observed harmonics with very narrow linewidths, while calculations show that the x-rays emerge as nearly time-bandwidth-limited pulse trains of ~100 attoseconds.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Science Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Science Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos