Browsing by Author "Namba, Shinichi"

Now showing items 1-6 of 6

    • Attosecond sublevel beating and nonlinear dressing on the 3d-to-5p and 3p-to-5s core-transitions at 91.3 eV and 210.4 eV in krypton 

      Seres, Enikoe; Seres, Jozsef; Namba, Shinichi; Afa, Iduabo John; Serrat Jurado, Carles (2017-12-11)
      Article
      Open Access
      Applying extreme ultraviolet (XUV) transient absorption spectroscopy, the dynamics of the two laser dressed transitions 3d5/2-to-5p3/2 and 3p3/2-to-5s1/2 at photon energies of 91.3 eV and 210.4 eV were examined with ...

    • Avalanche of stimulated forward scattering in high harmonic generation 

      Serrat Jurado, Carles; Roca, David; Budesca, Josep M.; Seres, Jozsef; Seres, Enikoe; Aurand, Bastian; Hoffmann, Andreas; Namba, Shinichi; Kuehl, Thomas; Spielmann, Christian (2016-04-05)
      Article
      Open Access
      Optical amplifiers in all ranges of the electromagnetic spectrum exhibit an essential characteristic, namely the input signal during the propagation in the amplifier medium is multiplied by the avalanche effect of the ...

    • Core-level attosecond transient absorption spectroscopy of laser-dressed solid films of Si and Zr 

      Seres, Enikoe; Seres, Jozsef; Serrat Jurado, Carles; Namba, Shinichi (American Physical Society, 2016-10-12)
      Article
      Open Access
      We investigated experimentally as well as theoretically the ultrafast response of the wave function of the conduction band (CB) of Si and Zr to a near-infrared laser field using extreme ultraviolet (XUV) absorption ...

    • Extreme-ultraviolet coherent pulse amplification in argon 

      Serrat Jurado, Carles; Seres, Jozsef; Seres, Enikoe; Namba, Shinichi (2019-06-25)
      Article
      Open Access
      The amplification of ultrashort extreme-ultraviolet (XUV) pulses in argon in high-order harmonic generation processes is studied by using the time-dependent Schrödinger equation in the spin-free one-active-electron and ...

    • Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation 

      Seres, Jozsef; Seres, Enikoe; Serrat Jurado, Carles; Dinh, Thanh Hung; Hasegawa, N.; Ishino, Masahiko; Nishikino, M.; Nakano, Kouji; Namba, Shinichi (2022-04-01)
      Article
      Open Access
      We report the realization and characterization of parametric amplification in high harmonic generation around 100 eV using He gas in a double gas jet arrangement. The delay of the seed extreme ultraviolet (XUV) pulse with ...

    • Soft-X-Ray High-Harmonic Source for Attosecond Transient Absorption Spectroscopy of Laser Dressed Gases and Solids 

      Seres, Enikoe; Seres, Jozsef; Afa, Iduabo John; Serrat Jurado, Carles; Namba, Shinichi (Optica Publishing Group, 2019)
      Conference report
      Restricted access - publisher's policy
      A soft-X-ray high harmonic source has been developed and applied for time-resolved Xray absorption spectroscopy of Krypton gas, Silicon and Zirconium solids at laser dressed transitions up to 220 eV with attosecond resolution.