A5100432143- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Nonlinear Photonic Systems
- Mechanical and Optical Resonators
- Gas Sensing Nanomaterials and Sensors
- Catalytic Processes in Materials Science
- Digital Radiography and Breast Imaging
- Orbital Angular Momentum in Optics
- Medical Imaging Techniques and Applications
- Luminescence Properties of Advanced Materials
- X-ray Spectroscopy and Fluorescence Analysis
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- International Business and FDI
- X-ray Diffraction in Crystallography
- Mercury impact and mitigation studies
Zhejiang Sci-Tech University
2021-2025
Wuhan University of Science and Technology
2024
Hubei University
2017-2023
University of Oklahoma
2011-2023
Shanxi University
2023
Tsinghua University
1997-2022
City University of Hong Kong
2018-2022
Hua Hong Semiconductor (China)
2022
Advanced Imaging Research (United States)
2021
Imaging Center
2021
Coherent ultraviolet light is important for applications in environmental and life sciences. However, direct lasing constrained by the fabrication challenge operation cost. Herein, we present a strategy indirect generation of deep-ultraviolet through tandem upconversion process. A core-shell-shell nanoparticle developed to achieve emission at 290 nm excitation telecommunication wavelength range 1550 nm. The ultralarge anti-Stokes shift 1260 (~3.5 eV) stems from combination distinct processes...
Abstract The applications of lanthanide-doped upconversion nanomaterials are limited by unsatisfactory brightness currently. Herein, a general strategy is proposed for boosting the efficiency in Er 3+ ions, based on combined use core−shell nanostructured host and an integrated optical waveguide circuit excitation platform. A NaErF 4 @NaYF nanoparticle constructed to process minimizing non-radiative dissipation energy surface quenchers. Furthermore, microring resonator designed promote...
Distinct corrosion behavior was reported in multiphased titanium alloys prepared by additive manufacturing and traditional technologies because of different phase constituents formed during processing. An open question is therefore raised: there always materials methods? This work reports resemble selective laser melted wrought single β-phase Ti-24Nb-4Zr-8Sn (Ti2448) both NaCl solution Hank's solution. The electrochemical measurements showed that samples have close calculated polarization...
Pb-free perovskite material is considered to be a promising utilized in next-generation X-ray detectors due its high absorption coefficient, decent carrier transport properties, and relatively low toxicity. However, the pixelation of with an industry-level photolithography processing method remains challenging poor structural stability. Herein, we use Cs2AgBiBr6 as prototype investigate interaction photolithographic polar solvents. Inspired by that, propose wafer-scale patterning method,...
We report a dual-polarization radio frequency (RF) channelizer based on microcombs. With the tailored mismatch between FSRs of active and passive MRRs, wideband RF spectra can be channelized into multiple segments featuring digital compatible bandwidths via Vernier effect. Due to use dual polarization states, number spectral segments, thus instantaneous bandwidth (with certain resolution), doubled. In our experiments, we used 20 microcomb lines with 49 GHz FSR achieve channels for each...
Fiber Bragg gratings with greatly enhanced thermal stability have been fabricated by the use of femtosecond laser pulse irradiation on optical fibers relaxed residual stress, through using high temperature annealing treatment.The grating reflectivity and resonant wavelength can be maintained for periods up to 20 hours isothermal measurements temperatures 1200 °C.No hysteresis was observed in response when were annealed cycled repeatedly between room ºC.
The spectral and annealing properties of a series fiber Bragg gratings (FBGs) written in both H 2 -loaded -free fibers by use 800nm femtosecond laser pulse irradiation created through phase mask, have been investigated.It is found that type II FBGs inscribed 2loaded exhibit superior quality when compared with those fibers.Isochronal tests shows the highest thermal stability, followed (in order stability) II, I then FBGs.The stability can effectively be increased using high temperature...
A novel fiber Bragg grating (FBG) has been inscribed in all solid by an infrared femtosecond laser. Temperature, strain and bending characteristics of the induced FBG are investigated experimentally. Four resonant dips transmission spectrum show positive sensitivity for temperature/strain zero-sensitivity wavelength. Cross-sensitivity between strain/temperature can thus be avoided since wavelengths insensitive to curvature variation when is bent toward two opposite directions. Evident...
Abstract The development of integrated microcomb in the visible light region attracts considerable interest due to their potential applications ranging from bioimaging quantum systems. However, apart handful reports phase‐locked microcombs, realization a has so far been elusive. Here, microcombs are experimentally demonstrated by frequency conversion near‐infrared (NIR) energetic soliton crystal high‐index doped silica glass (HDSG) micro‐ring resonator. Two‐color (green‐NIR) and even...
We report an all-optical radio-frequency (RF) spectrum analyzer with a bandwidth greater than 5 terahertz (THz), based on 50-cm long spiral waveguide in CMOS-compatible high-index doped silica platform. By carefully mapping out the dispersion profile of waveguides for different thicknesses, we identify optimal design to achieve near zero C-band. To demonstrate capability RF analyzer, measure optical output femtosecond fiber laser ultrafast regime.
This study presents the use of micro-ring resonator (MRR) devices to extract and enhance nonlinear signals. MRRs “trap” incoming light and, therefore, have been shown achieve extremely high local intensities light. Thus, they can be used facilitate highly optical signals that are usually weak in intensity require excitation power. By embedding materials host processes inside MRR, we expect observe an enhancement strength concept is demonstrated here by extracting Raman signature graphene...
A simple technique, based on nonlinear polarization rotation, for the amplitude equalization of high repetition rate pulses generated from a rational harmonic mode-locked fiber ring laser was demonstrated. Amplitude equalized at 10 GHz (the fourth harmonic) were obtained with component suppression ratio up to 30 dB. theoretical explanation given in detail, which indicates that, after pulse equalization, situation unequal spacing can be improved certain extend.
Nonlinear polarization rotation is used to compress pulses or suppress supermode noise in mode-locked fiber lasers at different situations. In this letter, we propose a novel method simultaneously realize the above two effects by exploiting nonlinear actively ring laser special state. A simple model derived theoretical analysis given explain phenomenon. We have also investigated transmission situations of 10-GHz laser. Experimental observations agree well with predictions.
High-speed all-optical clock recovery using a two-section gain-coupled distributed feedback laser is demonstrated operating in the coherent and incoherent modes. It found that mode has much better performance compared with mode. The of scheme at 12 40 Gb/s, including wavelength polarization insensitivity, timing jitter, phase noise; power penalty; sensitivity; dynamic range; locking bandwidth; detuning range injection wavelength; lockup time are described detail. A comparison between...
Bragg gratings written in H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -free and -loaded SMF-28 fiber by use of infrared (IR) femtosecond laser radiation with a phase mask have been investigated terms their axial cross-sectional morphology. It was found that Type I-IR II-IR refractive index changes existed simultaneously single grating (which is termed hybrid this paper) either or fiber. The proportion the two types key factor...
The objective of this study was to demonstrate the potential benefits using high energy x-rays for phase sensitive breast imaging through a comparison with conventional mammography imaging. We compared images contrast-detail phantom acquired on prototype x-ray system commercial flat panel digital unit. contrast were micro-focus source 50 µm focal spot at 120 kVp and 4.5 mAs, magnification factor 2.46 pixel pitch. A attenuation duality-based retrieval algorithm that requires only single image...
In this research, a high-energy in-line phase contrast tomosynthesis prototype was developed and characterized through quantitative investigations phantom studies.
The present study proposed a new method for characterizing linear viscoelastic (LVE) properties of asphalt concrete (AC) under triaxial loading conditions. presented adopted the relaxation spectrum model derived from Havriliak-Negami (HN) complex modulus and an existing confining pressure–dependent equilibrium to simulate master curves. confinement dependency curves was considered in instead time-temperature shift factor. A factor developed incorporate into HN spectrum. feasibility...
An all-optical clock recovery scheme for both the nonreturn-to-zero and return-to-zero formats has been proposed successfully demonstrated. Clock extraction, enhancement, clock-to-data suppression were realized by a semiconductor optical amplifier fiber Bragg grating. was achieved using two-section gain-coupled distributed-feedback laser. The large dynamic range of input power formats.
Wavelength- and polarization-insensitive all-optical clock recovery from data streams up to 96 Gb/s has been demonstrated by using a self-pulsing two-section gain-coupled distributed feedback laser semiconductor optical amplifier as wavelength converter. The sensitivity of the scheme is less than -10 dBm.