A5035051356- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Semiconductor Quantum Structures and Devices
- Optical Coatings and Gratings
- Advanced Fiber Optic Sensors
- Photonic Crystals and Applications
- Asphalt Pavement Performance Evaluation
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Terahertz technology and applications
- Particle Accelerators and Free-Electron Lasers
- Thin-Film Transistor Technologies
- Infrastructure Maintenance and Monitoring
- Advanced Semiconductor Detectors and Materials
- Surface Roughness and Optical Measurements
- Civil and Geotechnical Engineering Research
- Advanced X-ray Imaging Techniques
- Laser-Matter Interactions and Applications
- Advanced Optical Sensing Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Radiative Heat Transfer Studies
- Laser-Plasma Interactions and Diagnostics
Chongqing University
2019-2025
Yankuang Energy Group Company Limited (China)
2024
Changzhou University
2024
Naval University of Engineering
2024
National Time Service Center
2023
National Institute of Clean and Low-Carbon Energy
2023
China Energy Science and Technology Research Institute Co., Ltd. (China)
2023
Southwest University of Science and Technology
2023
University of Chinese Academy of Sciences
2023
Wuhan University of Science and Technology
2022
The frequency-drift of laser source is a crucial factor for influencing the performance phase-sensitive optical time domain reflectometer (Φ-OTDR). It induces signal fluctuation and severely limits measurement capacity low frequency. In this paper, twice differential method proposed to compensate influence laser-frequency-drift in Φ-OTDR. uses between two points on sensing fiber as reference then subtracts from main obtain final result. experiment, induced by decreased more than 95%. A...
Abstract Purpose We asked if retinal image quality is maximum during accommodation, or sub‐optimal due to accommodative error, when subjects perform an acuity task. Methods Subjects viewed a monochromatic (552 nm), high‐contrast letter target placed at various viewing distances. Wavefront aberrations of the accommodating eye were measured near endpoint staircase paradigm. Refractive state, defined as optimum vergence for maximising quality, was computed by through‐focus wavefront analysis...
A coating that embodies omnidirectional optical properties over a wide range of wavelengths and possessing specific wetting capabilities is established on glass platforms.
The spectroscopic techniques for time-resolved fine analysis of matter require coherent X-ray radiation with femtosecond duration and high average brightness. Seeded free-electron lasers (FELs), which use the frequency up-conversion an external seed laser to improve temporal coherence, are ideal providing fully soft pulses. However, it is difficult operate seeded FELs at a repetition rate due limitations present state-of-the-art systems. Here, we report novel self-modulation method enhancing...
Terahertz (THz) quantum cascade lasers (QCLs) are semiconductor-based electrically pumped laser sources that based on electron transitions between the subbands in conduction band of a multiple-quantum-well heterostructure. Being such, wavelength THz QCL can be tuned by varying thickness wells, covering frequency range ~1-5 THz. QCLs also high-power light region, with highest output power 100 mW and watt levels for continuous mode pulsed operation, respectively. However, there limitations...
Ultrasonic flowmeter is one of the most widely used devices in flow measurement. Traditional bulk piezoelectric ceramic transducers restrict their application to small pipe diameters. In this paper, we propose an ultrasonic gas based on a PZT micromachined transducer (PMUT) array. Two PMUT arrays with resonant frequency 125 kHz are as sensitive elements realize alternate transmission and reception signals. The sensor contains 5 × circular size 3.7 mm2. An FPGA resolution ns process received...
The rapid identification of the amount and characteristics chemical oxygen demand (COD) in influent water is critical to operation wastewater treatment plants (WWTPs), especially for WWTPs face with a low carbon/nitrogen (C/N) ratio. Given that, this study carried out batch kinetic experiments soluble (SCOD) nitrogen degradation three established machine learning (ML) models accurate prediction variation SCOD. results indicate that four different kinds components were identified via parallel...
Abstract The problem of coal compression under buildings is common in underground mining mines China. selection traditional programme subjective and lacks scientific rationality. In order to solve this problem, paper studies the evaluation index system model applicable filling scheme buildings. A multi-objective integrating economic, technical adaptive factors constructed. And an integrated optimization established, which based on grey target model, combining game theory optimal combination...
With a 45-cm-long capillary, we obtained saturated 69.8 nm laser with gain coefficient of 0.4 cm-1 and length product 18. In order to increase the energy further, double-pass amplification was first realized SiC mirror without coating. half cavity, effective plasma column can reach 84 cm 33.7, respectively. The amplitude pulse for is 9 times larger than that single-pass amplification. addition, full width at half-maximum (FWHM) FWHM divergence are 1.4 ns 0.5 mrad, respectively, which 2.2 3.4 mrad
A new deep-air-staging and low-NOx technology has been introduced to a 300 MWe anthracite- down-fired boiler with swirl burners. Industrial experiments were performed at different outer secondary air vane angles (defined as β) (i.e., 20°, 30°, 40°, 50°) evaluate the environmental economic performance for retrofitted boiler. Furthermore, combining previous investigations on inner angle α), influence degrees of β α anthracite combustion NOx emissions further analyzed compared. The experimental...
Abstract In this paper, physically-based simulations are carried out to investigate and design uni-traveling carrier photodiode (UTC-PD) for high-power sub-terahertz wave generation at zero- low-bias operation. The reliability of the simulation is demonstrated by comparing with our experimental result. Both bandwidth RF output power proposed UTC-PD significantly improved careful built-in electric field distribution under input. For optimized mesa diameter 5 μ m, its 3dB large than 100 GHz...
A back-back HVDC interconnector project is under construction at Luxi, Yunnan Province, China. One of two links the rated 1000 MW using VSC-HVDC technology. The secondary side converter transformer grounding through a 5kΩ resistor. maximum steady-state loss(MSL) resistor determines size and thermal designing resistor, meanwhile influences overload protection setting. In this paper, loss different operation modes analyzed. It can be concluded that MSL appears blocking state. Then, theoretical...
A novel Microstructure PIN photodiode (MPIN-PD) using the ray-optic theory of light trapping effect is presented and analyzed numerically. The MPIN-PD proposed from an ordinary large-diameter PIN-PD by introducing obconical shape surrounded a V-groove trench. photon-material interaction increased microstructure in PIN-PD. It can control cause syntony absorption layer, reducing junction capacitance PD, suppressing tradeoff between efficiency bandwidth. Thus, both 3-dB bandwidth quantum be...
A novel uni-traveling-carrier photodetector (UTC-PD), bonded to high-reflectivity (HR) distributed Bragg reflector (DBR) mirrors, referred as HR-UTC-PD, is first developed overcome the bandwidth-responsivity tradeoff in UTC-PDs at various wavelengths. Grubbs' test adopted, for time, measure thickness of random locations evaluating reflected light loss generated region. Compared with a standard UTC-PD without HR DBR maximum improvement HR-UTC-PD responsivity (0.88A/W 1560 nm) 24.4% under bias...
We analyze the properties of truly confined modes a slot-photonic crystal slab on silicon-on-insulator structures. Recently, Galli et al [1] have demonstrated enhancement photoluminescence in slabs, however, their structure supported only lossy modes. designed and calculated band linear defect guided for Two cladding configurations, which are strong candidates fabrication, investigated. The field mode offers significant promise new light emitting devices silicon.
This paper presents a novel architecture for annular and circular electrode piezoelectric micromachined ultrasound transducers (AC-PMUTs) with mechanical grooves. The grooves reduce stress increase the vibration area of membrane, resulting in enhanced vibrational deformation amplitude, transmission sensitivity, coupling coefficient (), quality factor (Q), emission sound pressure level (SPL). Compared conventional AC-PMUTs without grooves, transmitting displacement sensitivity was measured as...