A5056863593- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Terahertz technology and applications
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
Shenzhen Technology University
2018-2024
China Academy of Engineering Physics
2018-2021
Abstract The use of tunable pre-pulse is a common technique to enhance the high-order harmonic generation from surface plasma. shape and dynamic electron density, degree ionization its rate, plasma heating are influenced by properties. A non-uniform can generate spatially varying pre-plasma which offers for spectral up-conversion reflection. geometrical characteristics dynamics under intense laser fields subsequently affect properties emitted harmonics. In this study, variation in beam...
Short, brilliant pulses of MeV-level gamma rays with controllable orbital angular momentum (OAM) and small divergence angle would be useful for precision microscopy, nuclear imaging, radiography, micromanipulation, more. These are still unavailable, though, due to the unavoidable laser-induced damage associated traditional methods. The authors show how make such a gamma-ray pulse (shown in red), based on tailored interaction an intense OAM-carrying Laguerre-Gaussian laser (green) underdense...
Abstract The spatiotemporal optical vortex (STOV) laser pulse, characterized by containing a space-time dependent spiral phase structure and intrinsic transverse orbital angular momentum (OAM), has been of much recent research interest for basic physics as well potential applications in communication manipulation, the attosecond sciences. Here we consider electron acceleration generation hard x-rays irradiating thin foil with intense STOV pulse. It is found that affected electrons can be...
The dynamics of electron injection in the direct laser acceleration (DLA) regime was investigated by means three-dimensional particle-in-cell simulations and theoretical analysis. It is shown that when an ultra-intense pulse propagates into a near-critical density or relativistically transparent plasma, longitudinal charge-separation electric field excites ion wave. wave modulates local acts as set potential wells to guide electrons, located on edge plasma channel, central region, where DLA...
Abstract We propose to use intense optical vortex control laser-based ion acceleration for obtaining high-quality beams. An field favorable generating well-collimated energetic proton beams results from the interaction of a tailored laser pulse with thin solid-density foil in blowout regime. Three-dimensional particle-in-cell simulations show that protons can be efficiently accelerated GeV level form beam small radius (<1 μ m), narrow divergence (<0.1 rad), and low emittance (∼0.004 π...
Branched flow is an interesting phenomenon that can occur in diverse systems. It usually linear the sense does not alter properties of medium. light on thin films has recently been discovered. therefore interest to know whether nonlinear branching also occur. Here, using particle-in-cell simulations, we find case intense laser propagating through a randomly uneven medium, cascading local photoionization by incident laser, together with response freed electrons strong fields, triggers...
A scheme for controlling the direction of energetic proton beam driven by intense laser pulse is proposed. Simulations show that a precisely directed and collimated bunch can be produced sub-picosecond interacting with target consisting thin solid-density disk foil solenoid coil attached to its back at desired angle. It found two partially overlapping sheath fields are induced. As result, accelerated protons parallel axis solenoid, their spread angle also reduced fields. The properties thus...
The authors propose a scheme utilizing an underdense plasma of spiral thickness in generating relativistic vortex laser light with axial orbital angular momentum. ponderomotive and the charge-separation forces exert torque on ions, resulting creation oppositely directed ions light.
We propose exploiting the superluminal plasma wake for coherent Cherenkov radiation by injecting a relativistic electron beam (REB) into with slowly varying density up-ramp. Using three-dimensional particle-in-cell and far-field time-domain simulations, we show that an isolated subcycle pulse is coherently emitted towards angle bubble-sheath electrons successively at rear of REB-induced wake. A theoretical model based on current dipole has been developed to interpret such radiation, agrees...
In this study, we propose two full-optical-setup and single-shot measurable approaches for complete characterization of attosecond pulses from surface high harmonic generation (SHHG): SHHG-SPIDER (spectral phase interferometry direct electric field reconstruction) SHHG-SEA-SPIDER (spatially encoded arrangement SPIDER). 1D- 2D-EPOCH PIC (particle-in-cell) simulations were performed to generate the relativistic plasmas under different conditions. Pulse trains dominated by single isolated peak...
Abstract Intense attosecond light sources are required for investigating ultrafast electron dynamics, such as that in molecules and atoms, etc. However, so far the achievable photon energy remains at keV level, thereby limiting their range of applications. For instance, probing intranuclear dynamics requires energies gamma-ray regime. We propose here a scheme generating intense pulses by irradiating thin solid-density foil with vortex laser. In interaction, laser driven-foil electrons...
The use of a tunable pre-pulse is common technique to enhance the high-order harmonic generation from surface plasma. dynamic and structure pre-plasma influenced by intensity ionization, heating, expansion. Time delay between main pulse serves as crucial parameter for controlling distribution density. variation in emission directionality due density shape investigated. Particle-in-cell simulations suggest that both plasma hydrodynamics geometrical optical effect induces deflection beam...
The intensity of present x-ray lasers is still far from relativistic due to equipment damage by the powerful radiation involved in generation process. We propose use a microscopic concave plasma lens tightly focus terawatt pulses avoiding destructive instabilities arising laser-plasma interaction focusing Three-dimensional particle-in-cell simulations show that an intense laser pulse can be focused tiny spot wavelength scale at ultrahigh while well preserving its original spatiotemporal...