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Karl Krushelnick - One of the best experts on this subject based on the ideXlab platform.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions
    Scientific Reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander G. R. Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ( $$\sim $$ ∼ tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions.
    Scientific reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ([Formula: see text]tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

Jinpu Lin - One of the best experts on this subject based on the ideXlab platform.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions
    Scientific Reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander G. R. Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ( $$\sim $$ ∼ tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions.
    Scientific reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ([Formula: see text]tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

Parshotam Dass Gupta - One of the best experts on this subject based on the ideXlab platform.

  • Spectral, spatial, and polarization characteristics of harmonics generated at interaction of intense laser radiation with aluminum foils
    Nonresonant Laser-Matter Interaction (NLMI-10), 2001
    Co-Authors: Rashid A. Ganeev, Juzer Ali Chakera, M. Raghuramaiah, A.k. Sharma, P. A. Naik, Parshotam Dass Gupta
    Abstract:

    Investigations on harmonic generation in laser-matter interaction of Nd:glass laser radiation with solid surfaces have been performed. Detailed measurements were made on the intensity of second, third and fourth harmonics, their polarization properties and spectral distribution, as well as dependencies of these characteristics on intensity and polarization of the incident laser radiation. Intensity dependence of second, third and fourth harmonics for p- polarized laser pump shoed a power law scaling of 1.5, 1.8 and 3.8 respectively. Maximal conversion efficiencies for second, third and fourth harmonic generation were observed in the range of 10-8 to 10-12. For p- polarized laser radiation, the generation efficiency was more than ten and hundred times higher in comparison to that for the s-polarized radiation for second and third harmonics respectively. Among other features, rotation of second harmonic polarization as a function of laser intensity showed a quite different behavior for p- and s-polarized laser radiation, and the second harmonic observed in the specular Reflection Direction was red-shifted for laser intensity exceeding 5 by 1014 W cm-2.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Polarization effects in harmonic generation from solid surfaces
    Journal of Optics B: Quantum and Semiclassical Optics, 2001
    Co-Authors: Rashid A. Ganeev, Juzer Ali Chakera, M. Raghuramaiah, A.k. Sharma, P. A. Naik, Parshotam Dass Gupta
    Abstract:

    Investigations on polarization effects in harmonic generation from solid surfaces were performed in the intensity range 1013-1015 W cm-2 using 27 ps Nd:glass laser pulses. For an obliquely incident p-polarized laser beam, second, third and fourth harmonics were observed in the specular Reflection Direction with intensity scaling exponents of 1.5, 1.8 and 3.8 respectively. Second and third harmonic radiation generated using an s-polarized pump was about ten and hundred times smaller respectively compared to that for the p-polarized laser radiation. While the second harmonic produced by the p-polarized pump was almost fully p-polarized, that for the s-polarized pump had p- and s-components in the proportion of about 1:2. Faraday rotation observed in the polarization of reflected fundamental radiation can explain the relative harmonic yields for the p- and s-polarizations of the pump beam and the polarization structure of the second harmonic radiation.

  • Experimental study of harmonic generation from solid surfaces irradiated by multipicosecond laser pulses.
    Physical Review E, 2001
    Co-Authors: Rashid A. Ganeev, Juzer Ali Chakera, M. Raghuramaiah, A.k. Sharma, P. A. Naik, Parshotam Dass Gupta
    Abstract:

    An experimental study is presented on harmonic generation from solid surfaces using 27 ps Nd:glass laser pulses (lambda=1053 nm) in the intensity range of 10(13)-10(15) W cm(-2). Second, third, and fourth harmonics emitted in the specular Reflection Direction showed intensity scaling exponents of 1.5, 1.8, and 3.8 for an obliquely incident p-polarized laser beam, providing a conversion efficiency of 2x10(-8), 10(-10), and 5x10(-12) at 10(15) W cm(-2), respectively. Second and third harmonic radiation generated using an s-polarized pump was about 10 and 100 times smaller, respectively, compared to that for the p-polarized laser radiation. Faraday rotation observed in the reflected fundamental radiation can explain the relative harmonic yields for the p and s polarizations of the pump beam.

Thomas Batson - One of the best experts on this subject based on the ideXlab platform.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions
    Scientific Reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander G. R. Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ( $$\sim $$ ∼ tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions.
    Scientific reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ([Formula: see text]tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

John Nees - One of the best experts on this subject based on the ideXlab platform.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions
    Scientific Reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander G. R. Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ( $$\sim $$ ∼ tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.

  • Towards isolated attosecond electron bunches using ultrashort-pulse laser-solid interactions.
    Scientific reports, 2020
    Co-Authors: Jinpu Lin, Thomas Batson, John Nees, Alexander Thomas, Karl Krushelnick
    Abstract:

    We investigate MeV-level attosecond electron bunches from ultrashort-pulse laser-solid interactions through similarities between experimental and simulated electron energy spectra. We show measurements of the bunch duration and temporal structure from particle-in-cell simulations. The experimental observation of such bunches favors specular Reflection Direction when focusing the laser pulse onto a subwavelength boundary of thick overdense plasmas at grazing incidence. Particle-in-cell simulation further reveals that the attosecond duration is a result of ultra-thin ([Formula: see text]tenth of a micron) gaps of zero electromagnetic energy density in the modulated reflected radiation, while the bunching (locally peaked electron concentration) comes from the highly-Directional electron angular distribution acquired by the electrons in a grazing incidence setup. To isolate a single electron bunch, we perform simulations using 1-cycle laser pulses and analyze the effect of carrier-envelop phase with particle tracking. The duration of the electron bunch can be further decreased by increasing the laser intensity and the focal spot size, while its Direction can be changed by tuning the preplasma density gradient.