A5101840949- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Advanced MEMS and NEMS Technologies
- Machine Fault Diagnosis Techniques
- Advanced Surface Polishing Techniques
- Laser-induced spectroscopy and plasma
- Gear and Bearing Dynamics Analysis
- Thin-Film Transistor Technologies
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Acoustic Wave Phenomena Research
- Analytical chemistry methods development
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Laser Design and Applications
- Engineering Diagnostics and Reliability
- Mechanical Failure Analysis and Simulation
- Nanowire Synthesis and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Battery Technologies Research
- Image Processing Techniques and Applications
- Aerodynamics and Acoustics in Jet Flows
- Cultural Heritage Materials Analysis
- Microfluidic and Bio-sensing Technologies
Peking University
2003-2025
Xidian University
2019-2024
Shenyang University of Technology
2019-2024
Kunming University of Science and Technology
2022
Institute of Microelectronics
2005-2015
Institute of Modern Physics
2009-2014
Chinese Academy of Sciences
2009-2014
University of Chinese Academy of Sciences
2009
High-order harmonic generation (HHG) has a broad spectrum covering vacuum ultraviolet to extreme (XUV) bands, which is useful for applications involving material analyses at different information depths. Such an HHG light source perfect time- and angle-resolved photoemission spectroscopy. Here, we demonstrate high-photon flux driven by two-color field. Applying fused silica compression stage reduce the driving pulse width, obtained high XUV photon of 2 × 1012 phs/s @21.6 eV on target. We...
We report on a 2-GHz high-power Kerr-lens mode-locked Yb:KGW laser pumped by single-mode fiber laser. The output performance for two different coupling rates was investigated. Stable bidirectional mode-locking operation at the repetition rate of 2.157 GHz obtained with 0.6% coupler. average powers are 741 mW and 746 mW, 123-fs 126-fs pulse durations, respectively. By using 1.6% coupler, unidirectional is achieved 145-fs duration 1.7-W power, which, to best our knowledge, highest power from...
Low-frequency noise absorbers often require large structural dimensions, constraining their development in practical applications. In order to improve space utilization, an acoustic metamaterial with a spatial double helix, called helix resonator (SDHR), is proposed this paper. An analytical model of the double-helix established and verified by numerical simulations impedance tube experiments. By comparing absorption coefficients resonator, it shown that results model, experiments are good...
We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique, respectively. Up to 3.1-W average power with 103-fs pulse duration is obtained from mode-locking, down 36-fs more than 2-W achieved by pure which best our knowledge, highest reported sub-40-fs Yb-based solid-state oscillator.
The self-absorption effect in an optically thick plasma seriously affects the spectral line intensity and measurement accuracy of laser-induced breakdown spectroscopy (LIBS). In this work, a correction method based on self-calibration doublet lines belonging to same multiplet is proposed. K/Δλ0 parameter coefficient (SA) analytical element can be calculated measured actual ratio K parameters ratio. Compared with generally applied methods, effectively reduce influence laser energy plume...
The extraction of the vibration impulse signal plays a crucial role in fault diagnosis rolling element bearing. However, detection weak signals generally suffers strong background noise. To solve this problem, new adaptive multiscale enhanced combination gradient morphological filter (MECGMF) is proposed for In method, according to filtering ability four basic operators, an operation (ECGMF) first proposed. This design enhances MECGMF extract from And accordingly, selection strategy named...
Abstract A planetary gearbox with large transmission ratio is a critical component of wind turbine (WT). When the suffers from failure, regular variation circular pitch vibration energy contains fault pattern information. Although deep learning-based diagnosis models have capability for automatic feature extraction, they rarely consider emphasizing characteristics related to structure in data representation stage, which degrades performance. To solve this problem, paper describes novel...
In the operation and maintenance of planetary gearboxes, growth monitoring data is often faster than its analysis classification. Careful generally considered to require more expertise. Rendering machine learning algorithm able provide information, not just diagnosis conclusion, promising work. This paper proposes an two-stage framework based on time-frequency information analysis. first stage, a U-net model used for semantic segmentation vibration spectrum highlight faulty feature regions....
Because of the unique mechanical and electrical properties, silicon was widely used in IC/MEMS devices for decades. However, it is difficult to fabricate high aspect ratio structures when feature size scaling down 7nm. In this paper, single crystal Si nano barrel with wall thickness 6.7nm 50∶1 achieved by top-down process. The fabrication carried out Electron Beam Lithography (EBL) patterning DRIE pattern transfer, utilizing photoresist as etching mask directly. To predict profile, a model...
The longitudinal Schottky spectra of a radio-frequency (RF) bunched and electron cooled 22Ne10+ ion beam at 70 MeV/u have been studied by newly installed resonant pick-up the experimental cooler storage ring (CSRe), IMP. For an RF-bunched beam, momentum spread has reached with less than 107 stored ions. reduction compared coasting was observed from noise signal beam. In order to prepare future laser cooling experiment CSRe, RF-bunching power modulated 25th, 50th 75th harmonic revolution...
In order to increase the sensitivity of a cantilever-based biosensor, piezoresistive cantilevers with stress concentration holes were designed and fabricated. Firstly distributions vertical displacements simulated through ANSYS analyzing system. Then relative resistance changes piezoresistors as function cantilever measured. As expected, stresses are highly concentrated for cantilevers, this design can obviously result in an improvement on surface-stress mode
New results on laser cooling of stored, bunched, relativistic ion beams are presented. For the first time it has been possible to cool an beam with large momentum spread without initial electron or scanning bunching frequency by using a single cw system.
Attosecond pulses have potential applications in the fields of physics, chemistry, biology, and medicine owing to extremely high time resolution brought by their short pulse widths. The generation measurement technology attosecond provides a powerful means for study electron dynamical process atoms. Since date its birth, width an has become shorter shorter, making challenging task. Although are more widely used ultrafast dynamics interest is attracted into field science, it undeniable that...