The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 45, Issue 4
Special Issue on The Frontier for Attosecond Dynamics
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Special Issue on The Frontier for Attosecond Dynamics
Special Issue
Laser Review
  • Preface to Special Issue on the Frontier of Attosecond Dynamics Research
    Katsuya OGURI
    2017 Volume 45 Issue 4 Pages 205-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_205
    JOURNAL FREE ACCESS
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  • Development of an Ultrafast Infrared Light Source and its Application to Soft X-Ray Pulse Generation
    Nobuhisa ISHII
    2017 Volume 45 Issue 4 Pages 207-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_207
    JOURNAL FREE ACCESS
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    We report on the development of an ultrafast optical parametric chirped-pulse amplifi er, which produces 9.0-fs, 0.55-mJ, 1600-nm optical pulses at 1-kHz repetition rate with carrier-envelope phase（ CEP） stabilization, and its application to CEP-dependent high harmonic generation in the soft x-ray region. The high harmonics are extended to 325 eV well beyond the carbon K edge at 284 eV. Dependence of soft x-ray harmonic spectra on the CEP of the IR pulses verifi es the generation of an isolated attosecond pulse. A laser-based soft x-ray light source, which possesses unprecedented femtosecond to attosecond time resolution, is now becoming complementary to synchrotron-based light sources and free electron lasers.
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  • Observation of Attosecond Electron Wavepacket with Intense A-Few-Pulse Attosecond Pulse Tr
    Tomoya OKINO, Yasuo NABEKAWA, Katsumi MIDORIKAWA
    2017 Volume 45 Issue 4 Pages 212-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_212
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    We observed the temporal evolution of an attosecond electron wavepacket in a nitrogen molecule with an intense a-few-pulse attosecond pulse train. Such an intense a-few-pulse attosecond pulse train generated from a sub-15-fs laser system enables us to conduct attosecond-pump and attosecond-probe measurements of electron wavepackets formed among more than five bound electronic states. We recorded the momentum images of the nitrogen atomic ions generated from the dissociation processes in singly-charged manifolds as a function of the delay between the pump and probe pulses. The electronic states involved in the formation of electron wavepackets were identified by recording the temporal evolution of vibrational wavepackets.
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  • Petahertz Optical Drive with Semiconductor Electronics
    Hiroki MASHIKO, Katsuya OGURI, Hideki GOTOH
    2017 Volume 45 Issue 4 Pages 217-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_217
    JOURNAL FREE ACCESS
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    We successfully observed electronic oscillation (dipole oscillation) with attosecond (as: 10‒18 of a second) periodicity using gallium nitride (GaN) wide-bandgap semiconductor. A few-cycle near-infrared pulse induces the ultrafast electric interband polarization. The Dipole oscillation with 860-as periodicity in the GaN electron and hole system is revealed by the quantum interference constructed with the two transitions from the valence and conduction band states, which are probed by an extremely short isolated attosecond pulse with a coherent broadband spectrum. The resultant dipole frequency reaches 1.16 PHz (1015 Hz), making this the first time the petahertz frequency barrier has been exceeded with semiconductor. This study shows the potential of future petahertz signal processing technology based on ordinary wide-bandgap semiconductor devices.
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  • Attosecond Nano-Optics: Toward Light-Field-Driven Electronics
    Takuya HIGUCHI
    2017 Volume 45 Issue 4 Pages 221-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_221
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    When the electric field of light becomes comparable to or larger than the internal fields experienced by electrons in matter, the electron dynamics are then governed by optical-field-driven processes. By combining ultrashort laser pulses and the optical field enhancement at the surface of metallic nanostructures, such high-field strengths can be reached with moderate laser powers and without damaging the structures. Moreover, photoelectrons emitted from the surface under such intense optical fields with ultrashort durations are temporally and spatially well confined. Additionally, these electrons have been shown to be sensitive to the optical field waveform, underscoring the possibilities to control electron on a sub-optical, attosecond timescale. This review provides an overview of these strong-field-driven attosecond electron dynamics at nanostructures, extending its future ramifications as a key ingredient for light-field electronics, whose operation bandwidth may reach the petarahertz frequency range.
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  • Subcycle Response of Dielectrics by the Time-Resolved Dynamical Franz-Keldysh Effect under a Laser Field
    Tomohito OTOBE
    2017 Volume 45 Issue 4 Pages 226-
    Published: 2017
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.45.4_226
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    A theoretical investigation is reported describing the dynamical Franz-Keldysh effect (DFKE) in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function under an irradiation of an intense laser field. Two distinct approaches are developed for a pump-probe formalism: first-principles simulation based on real-time time-dependent density functional theory and analytic consideration of a simple two-band model. While time-average modulation may be reasonably described by the static Franz-Keldysh theory, a remarkable subcycle modulation and the phase shift is found to appear be- tween the dielectric response and the applied electric field for linear polarization. In contrast, the subcycle modulation of the dielectric function, a significant feature of the Tr-DFKE, disappears for circularly polarized laser.
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