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Showing 1 to 11 of 11 for “"high-order harmonic"”.
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Quantum Electrodynamic Theory of Optical High-Order Harmonic Generation
Based on the theoretical analysis, harmonies with higher orders are predicted to be generated with higher efficiency, if a means is devised to utilize more energetic photoelectrons to the harmonic generation process.
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Direct Observation of Laser Filamentation in High-Order Harmonic Generation
… of an intense laser pulse as it generates high-order harmonics in a long gas cell, filled with 80 torr of helium. A thin foil separates the gas-filled region of the cell from a subsequent evacuated region. The exit plane of the gas cell can be scanned along the laser axis so that the …
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Controlling Laser High-Order Harmonic Generation Using Weak Counter-Propagating Light
Laser high-order harmonic generation in the presence of relatively weak interfering light is investigated. The interfering pulses intersect the primary harmonic-generating laser pulse at the laser focus. The interfering light creates a standing intensity and phase modulation on the field, which …
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Modeling generation and characterization of attosecond pulses
Generation of high-order harmonics has emerged as a powerful technique for the generation of broadband coherent radiation in the EUV regime. This has lead to the development of table-top EUV sources that can produce attosecond pulses. These pulses can serve as a probe to resolve atomic attosecond …
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The Development of a Novel Femtosecond Xuv Light Source to Do Spectroscopy of Atoms and Molecules.
… less than 100 femtoseconds and an incredible high intensity ( I >1017 watts/cm2) to be obtained. When an atomic or molecular medium is exposed to such an intense field, the interaction between the medium and the field is unique. The field will ionize and/or dissociate a molecular medium. The …
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Photoelectrons and Recombining Electrons in Atomic and Molecular Systems
… thymine, uracil, and cytosine, is shown using high-resolution photoelectron spectroscopy. Chapters 7-8 discuss the use of elliptically polarized light for high-order harmonic generation as a probe for electron rescattering dynamics in the gas-phase medium.
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Atoms in intense ultrashort laser pulses and the absolute phase
… der Erzeugung hoher Harmonischer (``high-order harmonic generation'', HHG) und der Ionisation über Zustände im Kontinuum (``above-threshold ionization'', ATI). Besonders letzterer Effekt wird detailliert in Verbindung mit der Wechselwirkung mit Laserpulsen von nur wenigen Zyklen Länge …
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Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell
… nm bandwidth) laser pulses are used to study high-order harmonic generation in helium- and neon-filled gas cells of various lengths. Harmonic orders in the range of 50 to 100 are investigated. A semi-infinite cell geometry produces brighter harmonics than cells of sub-centimeter length. In the …
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Scaling and Gating Attosecond Pulse Generation
High-order harmonic generation (HHG) provides the basis for attosecond light sources delivering coherent pulses in the extreme ultraviolet spectral region. Such light sources are employed for a variety of applications within imaging, attosecond spectroscopy, and high-precision frequency metrology. …
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Design, optimization and analysis techniques of non-linear devices based on graphene or highly ordered pyrolytic graphite for terahertz system applications
… of passive devices with non-linear harmonic content. These devices are based on frequency multiplication and frequency mixing on mono- and multi-layer graphene films which are used for the generation and/or detection of submillimeter wave/ low THz band signals. The desired frequency …