A5085013015- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- Laser Design and Applications
- Phase-change materials and chalcogenides
- Solid State Laser Technologies
- Quantum chaos and dynamical systems
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Laser-Plasma Interactions and Diagnostics
- Quantum optics and atomic interactions
- Terahertz technology and applications
Hebei University
2024-2025
China Academy of Engineering Physics
2021-2024
Shaanxi Normal University
2017-2019
Hebei Normal University
2015-2017
The authors find a harmonic enhancement structure in the high-order generation spectrum of graphene. Further investigation indicates that is associated with bunching multiple interband electron-hole recombination trajectories, analogy to focusing behavior light rays known as caustics.
Antimony selenide (Sb2Se3) is emerging as an optically active material for optoelectronic devices. Understanding the carrier nonradiative recombination processes in Sb2Se3 crucial improvement of devices' performance. In this work, was investigated by transient absorption spectrum on broad time scale from hundred femtoseconds to several microseconds. The evolution has been associated with free and trapped process. Our temperature varying measurement also confirmed that insensitive...
We investigate the high-order harmonic generation in graphene irradiated by a linearly polarized intense laser, addressing ellipticity or polarization properties of harmonics. exploit time-dependent density functional theory to calculate spectra for laser wavelength 4770 nm and an intensity 1.7 $\mathrm{TW}/{\mathrm{cm}}^{2}$, our numerical results can qualitatively reproduce recent experimental data. Our simulations also reveal that depends on both order orientation angle between symmetric...
We investigate the attosecond transient absorption spectrum (ATAS) of graphene by numerically solving four-band density-matrix equations, which demonstrates apparent ``fishbone'' resonance structures. To gain insight into these interesting structures, we exploit a simplified model that considers only electrons $\mathrm{\ensuremath{\Gamma}}$ and $\mathrm{M}$ points in Brillouin zone. With help this model, can analytically express ATAS as sum zeroth- first-order Bessel functions variables...
We investigate the polarization properties of below-threshold harmonics from aligned molecules in linearly polarized laser fields numerically and analytically. focus on lower-order (LOHs). Our simulations show that ellipticity LOHs depends strongly orientation angle differs significantly for different harmonic orders. analysis reveals this LOH is closely associated with resonance effects axis symmetry molecule. These results shed light complex generation mechanism molecules.
We study the ellipticity of near-threshold harmonics (NTH) from aligned molecules with large internuclear distances numerically and analytically. The calculated harmonic spectra show a broad plateau for NTH which is several orders magnitude higher than that high-order harmonics. In particular, shows high at small intermediate orientation angles. Our analyses reveal main contributions to come transition electron continuum states these two lowest bound system, are strongly coupled together by...
We study the influence of pulse duration on high harmonic generation (HHG) by exploring a wide laser-parameter region theoretically. Previous studies have shown that for laser intensities close to saturation ionization intensity, HHG inversion efficiency is higher shorter pulses since ground-state depletion weaker in short pulses. Our simulations show this also appears moderate intensity at which not very strong. A classical effect relating travel distances rescattering electron contribute...
We investigate the high-order harmonic generations (HHGs) of graphene irradiated by linearly polarized lasers with intensities in a wide range from $10^{8}$ W/cm$^2$ to $10^{13}$ W/cm$^2$. find striking knee structure laser intensity dependence HHGs, which consists linear growth regime, followed plateau saturated and then transition nonlinear growth. The is rather universal for varied orders has been certificated calculations two-band density-matrix equations as well \textit{ab initio}...
In recent years, the rapid development of ultrashort pulse laser technology has made it possible to regulate ionization and dissociation dynamics atoms molecules. Among them, microscopic molecular have always been a hot topic. The phenomenon dissociation, which is caused by interaction between femtosecond intense fields <inline-formula><tex-math id="M3">\begin{document}$\text{H}_2^+$\end{document}</tex-math></inline-formula> molecules, attracted widespread attention....
We study high-order harmonic generation (HHG) from atoms with different ionization potentials by solving numerically the time-dependent Schrödinger equation. A numerical scheme is used which allows us to resolve contributions of only short electron trajectory HHG. With increasing laser wavelengths and reducing intensities, calculated short-trajectory HHG spectra show an energy region near threshold, where yields are suppressed strikingly. The width depends on potential target. that this...
We study the influence of pulse duration on high harmonic generation (HHG) with exploring a wide laser-parameter region theoretically. Previous studies have showed that for laser intensities near to saturation ionization intensity, HHG inversion efficiency is higher shorter pulses since ground-state depletion weaker in latter. Surprisingly, our simulations show this also appears even moderate intensity at which not strong. A classical effect relating travel distances rescattering electron...