When an atom or molecule is exposed to a short intense laser pulse, electrons that were removed at an earlier time may be driven back by the oscillating electric field of the laser to recollide with the parent ion, to incur processes like high-order harmonic generation (HHG), high-energy above-threshold ionization (HATI) and nonsequential double ionization (NSDI). Over the years, a rescattering...

Copy number variation (CNV) plays a role in pathogenesis of many human diseases, especially cancer. Several whole genome CNV association studies have been performed for the purpose of identifying cancer associated CNVs. Here we undertook a novel approach to whole genome CNV analysis, with the goal being identification of associations between CNV of different genes (CNV-CNV) across 60 human canc...

To study excitonic effects on high-harmonic generation (HHG) in Mott insulators, we investigate pumped nonequilibrium dynamics the one-dimensional extended Hubbard model. By employing time-dependent calculations based exact diagonalization and infinite time-evolving block decimation methods, find strong enhancement of HHG intensity around exciton energy. The subcycle analysis sub-Mott-gap regim...

We discuss a proposed experiment on guiding of a high-repetition rate, 20 GW, CO2 laser beam in a gas-filled hollow glass waveguide. Extended interaction of the 3ps pulses with a gas Kerr medium will be used for measurements of nonlinearity at 10 um, and supercontinuum generation followed by pulse compression. Feasibility of 3-5 keV X-ray production via HHG is presented.

The strong-field many-electron dynamics is studied via the resonance-enhanced high-order harmonic generation (HHG) of niobium. In intense IR lights excited states Nb with configuration $4{d}^{3}5s\phantom{\rule{0.16em}{0ex}}np$ play a vital role in enhanced HHG below ionization potential, even though electron initially occupying $5s$ orbital most active. energies these increase linearly laser i...

After more than two decades of attosecond physics, the generation and control shortest laser pulses available remains as a complex task. One main limitations reducing temporal duration emitted from high-order harmonic (HHG) is attochirp . In this contribution, we demonstrate that HHG assisted by strong fast oscillating magnetic fields enables Fourierlimited in water window. short, field generat...

A new scheme for quasi-phasematching high harmonic generation (HHG) in gases is proposed. In this, the rapid variation of the axial intensity resulting from excitation of more than one mode of a waveguide is used to achieve quasi phasematching. Numerical modeling demonstrates enhancement of the harmonic signal over that achieved for a single coherence length by factors >10(4).

Abstract We present an approach to assess the survival of single-atom effects in macroscopic high-harmonic generation (HHG) spectrum, by accounting for focal volume averaging. apply this technique R-matrix with time-dependence (RMT) studies, which are designed include full multielectron response atom. Such allows assessment features experimentally-measured HHG spectrum diffuse gases may be trac...

High-harmonic generation (HHG) from the condensed matter phase holds promise to promote future cutting-edge research in emerging field of attosecond nanoscopy. The key for progress relies on capability existing schemes enhance harmonic yield and push photon energy cutoff extreme-ultraviolet (XUV, 10–100 eV) regime beyond toward spectral “water window” region (282–533 eV). Here, we demonstrate a...

Extreme ultraviolet (XUV) radiation finds numerous applications in spectroscopy. When the XUV light is generated via high-order harmonic generation (HHG), it may be produced form of attosecond pulses, allowing access to unprecedented ultrafast phenomena. However, HHG efficiency remains limited. Here we present an observation a new regime coherent emission which has potential provide higher inte...