A5101799267- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Particle Accelerators and Free-Electron Lasers
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Photoacoustic and Ultrasonic Imaging
- Quantum Electrodynamics and Casimir Effect
- Optical Systems and Laser Technology
- Advanced X-ray Imaging Techniques
- Astronomical Observations and Instrumentation
- Mine drainage and remediation techniques
- Optical Coherence Tomography Applications
- Iron oxide chemistry and applications
- Advanced Fluorescence Microscopy Techniques
- Calibration and Measurement Techniques
- Pulsed Power Technology Applications
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Terahertz technology and applications
- Advanced Optical Sensing Technologies
- Ocular and Laser Science Research
Peking University
2023
National Taiwan University
2020-2021
Shanghai Jiao Tong University
2014-2018
ABSTRACT Laboratory experiments have been carried out to model the magnetic reconnection process in a solar flare with powerful lasers. Relativistic electrons energy up megaelectronvolts are detected along separatrices bounding outflow, which exhibit kappa-like distribution an effective temperature of ∼10 9 K. The acceleration non-thermal is found be more efficient case guide field (a component reconnection-induced electric field) than without field. Hardening spectrum at energies ≥500 keV...
Laser scanning confocal microscopy is a cellular biomedical analysis instrument used for fluorescence observation, and it has been widely in many fields of research. Article Guangdong medical university scientific research platform management service center the existing German leica TCS-SP8 laser microscope (hereinafter referred to as SP8), example, combined with entire school teachers students actual situation daily training operation process, summarizes use common problems solutions,...
We report on a plasma optical shutter to reduce the intensity level of nanosecond-duration pedestal amplified spontaneous emission (ASE) using an ultrathin foil. The foil is ionized by ASE prepulse and forms expanding underdense preplasma, which enables main laser pulse transmission, leading enhancement in temporal contrast. When such placed front target interest, preplasma profiles observed are similar that produced from single-layer reference irradiated high-contrast laser, can be finely...
We report experimental results on the effects of laser contrast beam divergence and energy spectrum protons emitted from ultrashort intense interactions with normal large foils transverse-size-reduced targets. Correlations between spectral shape are found. Large near-plateau observed for both types targets when pulse is low. With high irradiation, proton remarkably reduced changed to exponential foil In comparison, a similar remain The could be explained by preplasma formation target...
Proton emission from solid foil targets irradiated by relativistically intense femtosecond laser pulses is studied experimentally. Broad plateaus in energy spectra are measured micron-thick when the incident have relatively low intensity contrasts. It proposed that such proton can be attributed to combined processes of laser-driven collisionless shock acceleration and target normal sheath acceleration. Simple analytic estimation two-dimensional particle-in-cell simulations performed, which...
A series of experiments were carried out using the 200 TW laser facility at LLP, SJTU aiming to explore parametric scalings driven protons employing a low cost and stable high repetition rate tape drive target system. For numerous shots ∼0.2 Hz with maximum intensity up ∼5 × 1019 W/cm2 energy measured by varying energy, focal spot size pulse duration. The data suggests that scales as I∼0.6 while changing incident energy. Scaling trends are in good agreement previously reported experimental...
Abstract The first experimental measurements of intense ( ${\sim }7\times 10^{19}~ {\rm W}~ cm}^{-2}$ ) laser-driven terahertz (THz) radiation from a solid target which is preheated by an pulse laser-accelerated protons reported. total energy the THz found to decrease approximately factor 2 compared cold reference. This attributed increase in scale length preformed plasma, driven proton heating, at front surface target, where generated. results show importance controlling preplasma for production.
We present a novel design of two-dimensional (2D) angular-resolved spectrometer for full beam characterization ultrashort intense laser driven proton sources. A rotated 2D pinhole array was employed, as selective entrance before pair parallel permanent magnets, to sample the into discrete beamlets. The beamlets are subsequently dispersed without overlapping onto planar detector. Representative experimental result protons generated from femtosecond interaction with thin foil target is presented.
Proton emissions from vacuum-gapped cascaded-ultrathin-foil targets irradiated with low-contrast intense picosecond laser pulses were measured. The maximum energy of the proton beam and laser-to-proton conversion efficiency both increased in comparison those single-layer reference targets. A transition plateau to exponential profile spectral shape was found for target a front-foil thickness above 500 nm. measured annular x-ray front rear sides indicate that enhancement could be attributed...
The lateral transport patterns of energetic electrons in thin foil targets irradiated by relativistically intense, picosecond laser pulses with different peak-topedestal intensity contrast ratios are reported.For 'low contrast' pulses, a large current is found to be transported along the target front surface, due formation strong quasi-static electric and magnetic fields.This distinctly from case 'high where spatially confined.Although this reduces energy coupling efficiency into ions...
Abstract A beamline is required to focus proton beams produced by laser plasma accelerator high charge density spots for practical applications. The Compact LAser Plasma Accelerator (CLAPA) coupled with an image-relaying has been built at Peking University. While the collection section of this electromagnetic quadrupoles (EMQs) triplet certain aperture, more than 71 % protons are lost in inlet end face or vacuum tube wall due their divergence angles. Here we show development a transmission...
Flying plasma mirrors induced by intense lasers via laser wake field acceleration scheme have been proposed as a promising way to generate few-cycle EUV or x-ray lasers. In addition, if such relativistic mirror can accelerate, then it would serve an analog black hole investigate the information loss paradox associated with Hawking evaporation. Among these applications, reflectivity, which is usually frequency-dependent, affect outgoing photon spectrum and, therefore, impact on analysis of...
We report a new scenario of the time-of-flight technique in which fast neutrons and delayed gamma-ray signals were both recorded millisecond time window harsh environments induced by high-intensity lasers. The gamma signals, arriving far later than original neutron often being ignored previously, identified to be results radiative captures thermalized neutrons. linear correlation between photon number yield shows that these events can employed for diagnosis. This method reduce detecting...