High-harmonic generation articles within Nature Communications

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  • Article
    | Open Access

    The controlled generation of extreme-ultraviolet beams with controllable topological charge has not been demonstrated. Here, Gauthieret al. report on the generation of extreme-ultraviolet optical vortices with femtosecond duration carrying a controllable amount of orbital angular momentum.

    • D. Gauthier
    • , P. Rebernik Ribič
    •  & G. De Ninno

  • Article
    | Open Access

    Few methods can produce orbital angular momentum beams in the extreme ultraviolet or X-ray, and controlling orbital angular momentum on these beams remains challenging. Here the authors apply wave mixing to a tabletop high-harmonic source and control the topological charge of extreme ultraviolet beams.

    • Fanqi Kong
    • , Chunmei Zhang
    •  & P. B. Corkum

  • Article
    | Open Access

    High-harmonic generation is a nonlinear optical phenomenon that may be harnessed towards realisation of ultrafast light sources. Here, the authors theoretically show that localized plasmons in graphene nanodisks result in broadband and electrically tunable high-harmonic generation.

    • Joel D. Cox
    • , Andrea Marini
    •  & F. Javier García de Abajo

  • Article
    | Open Access

    It has been suggested that strong field enhancement for high harmonic generation may be achievable with nano-antennas. Here, the authors show relevant field enhancement using a metal-sapphire nanostructure that provides a solid tip as the high harmonic emitter, replacing commonly used gaseous atoms.

    • Seunghwoi Han
    • , Hyunwoong Kim
    •  & Seung-Woo Kim

  • Article
    | Open Access

    Twisted light beams have found several applications in the infrared and visible regime, but reaching the extreme ultraviolet has been difficult due to lack of sources. Here the authors report generation of helically shaped extreme ultraviolet trains of attosecond pulses via high harmonic generation.

    • R. Géneaux
    • , A. Camper
    •  & T. Ruchon

  • Article
    | Open Access

    Knowing whether a quantum phase transition is first- or second-order is crucial for understanding any associated exotic phenomena, but direct experimental evidence has been scarce. Here, Frandsen et al. report first-order magnetic quantum phase transitions in archetypal Mott systems, providing insight into the underlying quantum fluctuations.

    • Benjamin A. Frandsen
    • , Lian Liu
    •  & Yasutomo J. Uemura

  • Article
    | Open Access

    Intense laser-driven acceleration mechanisms are promising for the realization of compact particle accelerators. Here, the authors present a miniature linear accelerating module for laser-driven protons from a foil that addresses limitation in terms of peak energy, bandwidth and beam divergence.

    • Satyabrata Kar
    • , Hamad Ahmed
    •  & Marco Borghesi

  • Article |

    The generation of coherent X-ray radiation using a perturbative approach holds benefits over non-perturbative methods. Here, Dao et al. use high-intensity pulses at 800 and 1,400 nm to demonstrate an order-of-magnitude flux enhancement of extreme ultraviolet radiation by perturbative parametric amplification.

    • L V. Dao
    • , K B. Dinh
    •  & P Hannaford

  • Article
    | Open Access

    High harmonic generation (HHG) above the HHG threshold is understood using the three-step model, but the near- and below-threshold regimes are largely unexplored. Here, Li et al. shed light on the dynamic origin of the near- and below-threshold harmonic generation of caesium atoms in an intense mid-infrared laser field.

    • Peng-Cheng Li
    • , Yae-Lin Sheu
    •  & Shih-I Chu

  • Article
    | Open Access

    Time-resolved probing of electronic dynamics such as exciton formation and annihilation requires attosecond pulses at photon energies covering the absorption edges of materials. Here, Silva et al. experimentally demonstrate spatio-temporal isolation of single-attosecond soft X-ray pulses in the water window.

    • Francisco Silva
    • , Stephan M. Teichmann
    •  & Jens Biegert

  • Article |

    High-harmonic generation is now capable of delivering high-energy X-ray pulses with short duration, but achieving elliptical polarization remains challenging. Here, Lambert et al. use a cross-polarized two-colour laser field to produce elliptically polarized X-rays and measure magnetic circular dichroism in nickel.

    • G. Lambert
    • , B. Vodungbo
    •  & M. Fajardo

  • Article
    | Open Access

    The higher-harmonic generation of laser pulses is used to achieve short-wavelength attosecond pulses for ultrashort experiments, but has been limited in the achievable energy. Here, Ishii et al. develop a scheme to break this barrier and to achieve photon energies higher than the carbon Kedge of about 284 eV.

    • Nobuhisa Ishii
    • , Keisuke Kaneshima
    •  & Jiro Itatani

  • Article |

    Molecules emit high harmonics when driven by strong laser fields. Here, Spector et al. measure how the harmonic spectrum and strength depend on the laser polarization direction in the molecular frame, which leads to a better understanding of the high harmonic process.

    • Limor S. Spector
    • , Maxim Artamonov
    •  & Philip H. Bucksbaum

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