A5100454574- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Optical Wireless Communication Technologies
- Advanced Fiber Optic Sensors
- Optical Systems and Laser Technology
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Solid State Laser Technologies
- Advanced optical system design
- Ocular and Laser Science Research
- Image Processing Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Advanced Chemical Physics Studies
- Advanced Image and Video Retrieval Techniques
- Laser Design and Applications
- Optical Coherence Tomography Applications
- CO2 Sequestration and Geologic Interactions
- Random lasers and scattering media
- Iterative Learning Control Systems
- Robotics and Sensor-Based Localization
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Advanced Optical Sensing Technologies
- Advanced Measurement and Metrology Techniques
Tsinghua University
2015-2024
Guangdong University of Technology
2024
Taiyuan University of Technology
2024
National Astronomical Observatories
2024
Changchun Observatory
2024
Chinese Academy of Sciences
2024
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering
2023
Ministry of Water Resources of the People's Republic of China
2023
Yunnan Observatories
2022
Xi'an Shiyou University
2018-2020
A pulsating soliton exists in various passively mode-locked fiber lasers. Versatile categories of solitons have been investigated a steady regime. However, the formation dynamics not fully revealed. Herein, we experimentally captured both single and two processes an all-normal-dispersion laser. With help time-stretch dispersion Fourier transform technique, real-time temporal spectral evolutions solitons, during buildup process, were investigated. It is found that pulsation directly derives...
Abstract The TianQin Project is aiming at gravitational wave (GW) detection in space. GW observatory comprises three satellites orbiting on 1 × 10 5 km Earth orbits to form an equilateral-triangle constellation. In order minimize the variations arm lengths and breathing angles, must be launched adjusted precisely into optimized orbit. Therefore, satellite laser ranging used enhance precision of orbit determination. To develop capability for TianQin’s orbit, Laser Ranging Station has been...
Traditional feature matching methods of optical and synthetic aperture radar (SAR) used gradient are sensitive to non-linear radiation distortions (NRD) the rotation between two images. To address this problem, study presents a novel approach solving rigid body problem by two-step process. The first step proposes deep learning neural network named RotNET predict relationship second uses local descriptor based on Gaussian pyramid features oriented gradients (GPOG) match analyze histogram...
This paper presents a mobile-agent and OSGi based three-tier control system architecture for smart home. In the platform of home gateway, UPnP technology intelligent agent works together to achieve automation devices discovery, registry, management. By means middleware mobile technology, proposed hierarchical supports remote fault diagnosis, dynamic service provisioning, flexible performance management, integration heterogeneous devices, agent-based distributed control.
Generation of nanosecond pulses with 55-mJ energy and 4.8-MW peak power are demonstrated in a multistage fiber amplifier system, which is seeded 10-nm broadband from superluminescence diode. The at low repetition 10 Hz width ns. High high for obtained simultaneously amplifier. In particular, the least two times previous pulses.
Nanosecond (~10 ns) laser pulses with high peak power of 8 MW and energy 100 mJ are reported, which generated by a cascaded pulsed Yb-doped fiber amplifier system working at repetition frequency 10 Hz. The that is higher than the self-focusing threshold for Gaussian beams achieved first time in lasers. To analyze multimode lasers fibers, novel mode decomposition based on beam quality measurements introduced. Based nonlinear propagation simulations, our case estimated.
An all-polarization maintaining mode-locked Yb-doped fiber integrated laser with a nonlinear amplifying loop Mirror (NALM) under the operation regime of dissipative soliton resonance (DSR) has been demonstrated. The can generate DSR pulses at 1.04 μm repetition rate 2.59 MHz. output be tuned in pulse width from hundreds picoseconds to few nanoseconds by adjusting pump power. By changing power main and NALM, maximum average 51.4 mW corresponding energy about 20 nJ are achieved, respectively....
We propose a novel phase mask called the rational (RPM) to extend depth of field in optical-digital hybrid imaging systems. Using invariance defocus modulation transfer function as merit function, we adopt simulated annealing algorithm optimize RPM together with other three existing masks. Numerical comparisons prove RPM's superiority.
The hydrogen bonding of 1:1 complexes formed between alanine and water molecules has been completely investigated in the present study using density functional theory, method B3LYP at varied basis set levels from 6-31G to 6-311++G(d,p) second-order Møller−Plesset perturbation 6-31++G(d,p) level. Eight reasonable geometries on potential energy hypersurface system are considered with global minimum. optimized geometric parameters interaction energies for various isomers different estimated....
A novel concept of collision avoidance single-photon light detection and ranging (LIDAR) for vehicles has been demonstrated, in which chaotic pulse position modulation is applied on the transmitted laser pulses robust anti-crosstalk purposes. Besides, detectors (SPD) time correlated single photon counting techniques are adapted, to sense ultra-low power used consideration compact structure eye safety. Parameters including rate, discrimination threshold, number accumulated have thoroughly...
A good understanding of CO2–brine–rock interactions that cause microscale damage to the microstructure sandstone, affecting pore fluid transport and reservoir stability, is important for studying storage efficiency during CO2 storage. In this study, equipment first designed saturate rock samples using CO2–brine under in situ conditions then homogeneous heterogeneous sandstone are saturated 30 days with without confining pressure (20 MPa). Through scanning electron microscopy (SEM)...
We investigate the average power scalability of all-normal-dispersion fiber integrated lasers with a nonlinear amplifying loop. This laser generates 34 ps pulses at repetition 8 MHz and spectral width 30 nm when increased to highest power. The operates on single-pulse train regime can be de-chirped as short 200 fs. 60 mW output which maintained while operating low Raman effect is achieved for this type in sub-200 fs regime. becomes unstable due strengthening Raman–Stokes pulse. Output show...
Purpose Natural gas hydrate (NGH) has been regarded as one of the most important resources due to NGH's large amounts reserve. However, NGH development still faces many technical challenges, such low production rate and reservoir instability resulting from decomposition. Therefore, developing a fully coupled THMC model for simulating decomposition studying its mechanical behavior is very necessary. The purpose this article develop solve multi-phase, strong nonlinearity large-scale...
The feasibility of a thermal-induced refractive-index planar waveguide laser was demonstrated. condition for the guided modes to be confined in gain region calculated. A made simply by pumping thin center layer slab crystal and its can controlled thermal input unit area pumped width. An output power 23.1 W with an optical conversion efficiency 46% obtained. is very promising efficient bright sources due simple structure.
Zernike polynomials are commonly used to describe the aberration of light beams, and beam quality Gaussian beams with aberrations can be deduced when order is limited. In this paper, Hermite utilized reconstruct beams. The factor directly related coefficient terms has no limit on its index. We analyzed a quartic other former 11th by polynomial expansion. result corresponds published research work.
SPM is an important limitation in some fiber lasers and amplifier systems. In this paper, the influence of gain saturation on SPM-induced spectral broadening for coherent incoherent nanosecond pulses discussed. The models are generalized to amplification with saturation. Experiments conducted validate our theoretical analysis a super-luminescent diode seeded cascaded system where high peak power pulse energy generated occurs. Excellent agreements between experimental results obtained, higher...