A5059230683- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Terahertz technology and applications
- Superconducting and THz Device Technology
- Orbital Angular Momentum in Optics
- Laser-Plasma Interactions and Diagnostics
- Nonlinear Photonic Systems
- Spectroscopy and Laser Applications
- Laser-induced spectroscopy and plasma
- Photonic Crystal and Fiber Optics
- Solid State Laser Technologies
- Nonlinear Waves and Solitons
- Advanced Optical Sensing Technologies
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Gyrotron and Vacuum Electronics Research
- Atomic and Molecular Physics
- Plasmonic and Surface Plasmon Research
- Cloud Computing and Resource Management
- Advanced Fluorescence Microscopy Techniques
- Near-Field Optical Microscopy
- Spectroscopy Techniques in Biomedical and Chemical Research
- Ferroelectric and Negative Capacitance Devices
- Advanced Memory and Neural Computing
- Optical Network Technologies
Shenzhen University
2016-2025
Alibaba Group (China)
2024
Lanzhou Jiaotong University
2024
Heilongjiang Provincial Academy of Agricultural Sciences
2024
Alibaba Group (Cayman Islands)
2023
Xi'an Jiaotong University
2023
Tsinghua University
2004-2023
Northwest Institute of Nuclear Technology
2017
Shanghai Institute of Optics and Fine Mechanics
2008-2012
Chinese Academy of Sciences
2006-2010
Learning is highly important for edge intelligence devices to adapt different application scenes and owners. Current technologies training neural networks require moving massive amounts of data between computing memory units, which hinders the implementation learning on devices. We developed a fully integrated memristor chip with improvement ability low energy cost. The schemes in STELLAR architecture, including its algorithm, hardware realization, parallel conductance tuning scheme, are...
We compare the use of free-space electro-optic sampling (FSEOS) with photoconducting antennas to detect terahertz (THz) radiation in range 0.1–3 THz. For same average THz power and low-frequency modulation, signal-to-noise ratio sensitivity are better antenna detection at frequencies smaller than 3 When modulation frequency is increased more 1 MHz FSEOS, both schemes have comparable performance. Using a singular-electric-field emitter, we demonstrate feasibility imaging system using...
We present new designs of more efficient terahertz (THz) radiation emitters and detectors enhanced by electric field singularities using sharp laterally offset electrodes. compare the performances emission different polarization properties resulting from these structures. An average THz power 3 μW is achieved under 20 mW excitation, calibrated free space electro-optic sampling. also study gap size dependence radiation, find an absence a positive electrode effect in small limit.
We report a framing imaging based on noncollinear optical parametric amplification (NCOPA), named FINCOPA, which applies NCOPA for the first time to single-shot ultrafast imaging. In an experiment targeting laser-induced air plasma grating, FINCOPA achieved 50 fs-resolved with spatial resolution of ∼83 lp / mm and effective frame rate 10 trillion frames per second (Tfps). It has also successfully visualized rotating field 15 Tfps. simultaneously femtosecond-level temporal interval...
This paper reports an ytterbium-doped linear-cavity fiber laser with the optical length of 1.6 km passively mode-locked by a high modulation depth semiconductor saturable absorber mirror (SESAM). An ultra-low repetition rate 191 kHz was achieved. The delivered highly-chirped output pulses energy up to 75.2 nJ.
Abstract Traditionally, manipulation of spatiotemporal coupling (STC) the ultrafast light fields can be actualized in space-spectrum domain with some 4-f pulse shapers, which suffers usually from limitations, such as spectral/pixel resolution and information crosstalk associated shapers. This work introduces a novel mechanism for direct space-time to overcome limitations. combines space-dependent time delay spatial geometrical transformations, has been experimentally proved by generating...
This paper reports the experimental realization of efficiently sorting vector beams by polarization topological charge (PTC). The PTC a beam can be defined as repetition number state change along azimuthal axis, while its sign stands for rotating direction polarization. Here, couple liquid crystal Pancharatnam–Berry optical elements (PBOEs) have been used to introduce conjugated spatial phase modulations two orthogonal circular states. Applying these PBOEs in 4-f system, our experiments show...
Last decade has witnessed a rapid development of the generation terahertz (THz) vortex beams as well their wide applications, mainly due to unique combination characteristics regular THz radiation and orbital angular momentum (OAM). Here we have reviewed ways generate by two representative scenarios, i.e., wavefront modulation via specific devices, direct excitation helicity beams. The former is similar those engineering devices in optical infrared (IR) domain, but just with suitable...
Abstract We report on a vortex laser chirped-pulse amplification (CPA) system that delivers pulses with peak power of 45 TW. A focused intensity exceeding 10 19 W/cm 2 has been demonstrated for the first time by scheme. Compared other schemes strong-field generation high energy flux but narrowband vortex-converting elements at end laser, an important advantage our scheme is we can use broadband size-limited q-plate to realize mode-converting in front CPA system, and achieve high-power series...
In many scenarios, it is really desirable but challenging for wide-field imaging to gather both the clear morphologies and fine details of target. This paper realizes this by a dual-mode on optical parametric amplification (OPA) with vortex laser pump. design includes signal idler imaging, which have complementary point spread functions each other. The acts as bright-field record morphologic information, whereas does so spiral phase contrast capture featured high brightness contrast, has...
Amplifier-free coherent systems are promising for short-reach links, but these constrained by signal peak power instead of average power. In this paper, we propose a novel, to the best our knowledge, quadrant-partitioning uniformly distributed modulation (QP-UDM) scheme peak-power-constrained amplifier-free systems. The proposed achieves finer orders than conventional UDM schemes. It also avoids problem in amplitude-division irregular quadrature amplitude modulation, where order check bit...
Angular and energy distributions of fast electrons generated from the interaction 60 fs, 795 nm laser pulses with aluminum targets have been experimentally investigated in various conditions. Increasing intensities nonrelativistic to relativistic, a transition angular distribution outgoing specular reflection direction target normal has observed for p-polarized irradiation. The electrons’ spectrum at high intensity, e.g., ∼2.6×1018 W/cm2, consists two peaks, which are found originate low...
Converting a Gaussian mode to vortex beam is much more inconvenient in the terahertz (THz) region than near-infrared (NIR) due underdevelopment of THz components and strong diffraction. This Letter reports direct generation pulses by optical difference-frequency between two NIR chirped with different topological charges (TCs). By designing passive transmissive device for collinear pulse pair conjugated TCs, we have experimentally obtained stable TC value 2 or -2. The process needs no so...
High spatial resolution on the image plane (intrinsic resolution) has always been a problem for ultrafast imaging. Single-shot imaging methods can achieve high object through amplification systems but with low intrinsic resolutions. We present frequency domain integration sequential (FISI), which encodes transient dynamic by an inversed 4f (IFF) system and decodes it using optical frequencies recognition (OFR), overcomes limitation of algorithm. In experiment process air plasma channel, FISI...