نتایج جستجو برای: hhg
تعداد نتایج: 293 فیلتر نتایج به سال:
We report on a newly built laser-based tabletop setup which enables generation of femtosecond light pulses in the XUV range employing the process of high-order harmonic generation (HHG) in a gas medium. The spatial, spectral, and temporal characteristics of the XUV beam are presented. Monochromatization of XUV light with minimum temporal pulse distortion is the central issue of this work. Off-c...
High-harmonic generation (HHG) in solids is an emerging method to probe ultrafast electron dynamics at attosecond timescale. In this work, we study HHG from monolayer and bilayer graphene. Bilayer graphenes with AA AB stacking are considered work. It found that the exhibit significantly different harmonic spectra. The difference spectra attributed interlayer coupling between two layers. Also, i...
We theoretically investigate the piezo-optic effect of high-harmonic generation (HHG) in shear-strained semiconductors. By focusing on a typical semiconductor, GaAs, we show that there is optical activity, meaning different responses to right-handed and left-handed elliptically polarized electric fields. also this activity more pronounced for higher harmonics whose perturbative order exceeds ba...
Gas jets used as sources for high harmonic generation (HHG) have a complex three-dimensional density and velocity profile. This paper describes how the profile influences the generation of extreme-UV light. As the position of the laser focus is varied along the jet flow axis, we show that the intensity of the output radiation varies by approximately three times, with the highest flux being obse...
A theoretical investigation is conducted of high-order harmonic generation (HHG) in silicon thin films to elucidate the effect light propagation reflected and transmitted waves. The first-principles simulations are performed process which an intense pulsed irradiates up $3\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{m}$ thickness. Our carried within time-dependent density functional theo...
We theoretically investigate high harmonic generation (HHG) from silicon thin films with thicknesses a few atomic layers to hundreds of nanometers, determine the most efficient thickness for producing intense HHG in reflected and transmitted pulses. For this purpose, we employ theoretical computational methods. The sophisticated method is ab initio time-dependent density functional theory coupl...
High harmonic generation in complex multi-electron systems is investigated theoretically. The harmonic spectra exhibit two cutoffs. The first cutoff is in good agreement with the well established, single active electron cutoff law. The second cutoff presents a signature of multi-electron dynamics. The strong laser field excites nonlinear plasmon oscillations. Electrons that are ionized from one...
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