A5068595159- Photonic and Optical Devices
- Laser-Plasma Interactions and Diagnostics
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Terahertz technology and applications
- High-pressure geophysics and materials
- Gyrotron and Vacuum Electronics Research
- Radio Frequency Integrated Circuit Design
- Particle Accelerators and Free-Electron Lasers
- Fusion materials and technologies
- Dust and Plasma Wave Phenomena
- Superconducting and THz Device Technology
- Hemoglobinopathies and Related Disorders
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Genomic variations and chromosomal abnormalities
- Advanced X-ray Imaging Techniques
- Pulsed Power Technology Applications
- Spectroscopy and Laser Applications
- Prenatal Screening and Diagnostics
- Ion-surface interactions and analysis
- Magnetic confinement fusion research
Fudan University
2024-2025
Shanghai Micro Satellite Engineering Center
2025
National Synchrotron Radiation Research Center
2024
Chinese Academy of Sciences
2003-2020
Shanghai Jiao Tong University
2016-2020
Institute of Physics
2008-2020
Czech Academy of Sciences, Institute of Physics
2010
National Laboratory for Superconductivity
2010
While major progress has been made in the research of inertial confinement fusion, significant challenges remain pursuit ignition. To tackle challenges, we propose a double-cone ignition (DCI) scheme, which two head-on gold cones are used to confine deuterium-tritium (DT) shells imploded by high-power laser pulses. The scheme is composed four progressive controllable processes: quasi-isentropic compression, acceleration, collision and fast heating compressed fuel. compression performed...
This paper presents a wide-bandwidth back-illuminated modified uni-traveling-carrier photodiode (MUTC-PD) packaged with standard WR-5 rectangular waveguide for high-speed wireless communications. With optimized epitaxy structure and coplanar electrodes, the fabricated 4-μm-diameter PD exhibits ultra-flat frequency response high saturation power. Integrated passive circuits including low-loss bias-tee E-plane probe are designed to package into compact module output. The has demonstrated flat...
Photonic millimeter-wave communication systems are promising for high-capacity, high-speed wireless networks, and their production is driven by the growing demand from data-intensive applications. However, challenges such as inter-symbol interferences (ISIs), inter-band (IBIs), symbol timing offsets (STOs), nonlinearity impairments exist, especially in non-orthogonal multiband configurations. This paper proposes demonstrates neural network-based waveform-to-symbol converter (NNWSC) a...
The development of tabletop intense terahertz (THz) radiation sources is significantly important for THz science and applications.This paper presents our measurements from relativistic laser-plasma interactions under different experimental conditions.Several generation mechanisms have been proposed investigated, including coherent transition emitted by fast electrons the target rear surface, transient current at front target, mode conversion electron plasma waves to waves.The results...
Back-illuminated modified uni-traveling carrier photodiode (MUTC-PD) with improved saturation performance at high frequencies is developed and its application in wireless communications demonstrated. A gradient doped absorption region a cliff layer optimized doping concentration are adopted to fine-tune the electric field within device, so as alleviate space-charge screening for performance. Passive circuits fabricated on 127-μm-thick quartz substrate low transmission loss. The 8-μm-diameter...
Abstract In order to meet the upcoming RF power requirements of TPS, a five-year upgrade project construct new station was completed in early 2022. This mainly consists an SRF module, 300-kW SSPA, analog LLRF control system, transmission components, and accessary cooling systems. Test results module SSPA met expected performances. Also presented are operation statistics two original stations ongoing upgrades. Meantime between failures during TPS user time reached 600 hours 2022, while...
Heating of the target core for fast ignition by electron beams is investigated two-dimensional collisional particle-in-cell simulations. It found that emitted from surface with initial energy 1.4MeV, 2.4MeV, and 4.2MeV can heat most efficiently ρr = 0.75g/cm2, 1.5g/cm2, 3g/cm2, respectively, when taking ρ 300g/cm3, where r are mass density radius core, respectively.
We report the experimental generation of an electrostatic collisionless shock in counter-streaming plasmas without external magnetic field. The were created by a high-power laser. expansion was measured with interferometry and shadowgraphy. Large density jump observed both diagnostics. is because width this much shorter than ion-ion mean-free-path calculated from flow velocities densities. Particle-in-cell simulations suggest formation plasmas. In our experiment, considering width, shock.
The behaviors of the blast waves produced by femtosecond laser-water interactions, and induced laser self-focusing in air, have been investigated using optical shadowgraphy at a maximum intensity 1 x 10(16) W/cm(2). temporal evolution wave launched water plasma can be described planar model including source mass. An aneurismlike structure, due to quick propagation inside hollow channel formed self-focusing, is observed. expansion air found agree with cylindrical self-similar solution.
We demonstrate field trials of E/W-Band wireless transmission based on full-photonic up- and down-conversions, achieving 26.8-km delivery 32-Gb/s signal, 30.4-km 22-Gb/s the largest net-rate-distance-product up-to 745.74 Gb/s·km per-channel.
Current wireless communication systems are increasingly constrained by insufficient bandwidth and limited power output, impeding the achievement of ultra-high-speed data transmission. The terahertz (THz) range offers greater bandwidth, but it also imposes higher requirements on broadband high-power devices. In this work, we present a modified uni-traveling-carrier photodiode (MUTC-PD) module with WR-6 waveguide output for photonics-assisted fiber-THz integrated communications. Through...
Abstract Current wireless communication systems are increasingly constrained by insufficient bandwidth and limited power output, impeding the achievement of ultra‐high‐speed data transmission. The terahertz (THz) range offers greater bandwidth, but it also imposes higher requirements on broadband high‐power devices. In this work, a modified uni‐traveling‐carrier photodiode (MUTC‐PD) module with WR‐6 waveguide output is presented for photonics‐assisted fiber‐THz integrated communications....
Laser plasmas are capable of creating unique physical conditions with extreme high energy density, which not only closely relevant to inertial fusion studies, but also laboratory simulation some astrophysical processes. In this paper, we highlight recent progress made by our research teams. The first part is about directional hot electron beam generation and transport for fast ignition confinement fusion, as well a new scheme use strong external DC magnetic field. second concerns modeling...
The terahertz (THz) radiation from the front of solid targets with a large-scale preplasma irradiated by relativistic picosecond laser pulses has been studied. THz measured at specular direction nonlinearly increases energy and an optimal plasma density scalelength is observed. Particle-in-cell simulations indicate that can be attributed to model mode conversion. While near target normal saturated scalelength. Unlike in direction' transient current formed plasma-vacuum interface could...
Lateral propagation of fast electrons at the target surfaces irradiated by femtosecond intense laser pulses is measured kα x-ray imaging technique when a preplasma presented. An annular halo surrounding bright spot observed in images scale length electron density large. For an incidence angle 70° show non-symmetrical distribution peaked to direction. The photons are mainly excited that flow their paths intersect high regions near surface.
One order of magnitude energy enhancement the target surface electron beams with central at 11.5 MeV is achieved by using a 200 TW, 500 fs laser an incident angle 72° prepulse intensity ratio 5×10-6. The experimental results demonstrate scalability acceleration process to high longer (sub-picosecond) pulse duration and higher (120 J). total charge beam 400±20 pC(E>2.7 MeV). Such orientation mono-energetic jet would be good method solve problem large divergence in fast ignition schemes...
A scheme for focusing relativistic electron beams has been proposed by use of a solid cone based upon two dimensional particle-in-cell simulations. We compare the transport hot electrons, produced during interaction ultra-intense laser pulse with targets, through shape target and flat target. It is found that electrons can be confined focused effectively in case, where both density temperature have increased more significantly than case.