A5101769342- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Cryospheric studies and observations
- Photonic and Optical Devices
- Advanced Surface Polishing Techniques
- Hydrology and Watershed Management Studies
- Particle Accelerators and Free-Electron Lasers
- Innovative Microfluidic and Catalytic Techniques Innovation
- Photorefractive and Nonlinear Optics
- Laser-induced spectroscopy and plasma
- Nanofabrication and Lithography Techniques
- Advanced Fiber Laser Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Climate change and permafrost
- Ocular and Laser Science Research
- Climate variability and models
- Gyrotron and Vacuum Electronics Research
- Optical Coherence Tomography Applications
- Optical Systems and Laser Technology
- Terahertz technology and applications
- Arctic and Antarctic ice dynamics
- Semiconductor Lasers and Optical Devices
- Laser Design and Applications
- Photonic Crystals and Applications
- Laser-Ablation Synthesis of Nanoparticles
Northeast Institute of Geography and Agroecology
2024
Chinese Academy of Sciences
2016-2024
Institute of Tibetan Plateau Research
2016-2024
Tsinghua University
2014-2024
East China Normal University
2021-2024
Tianjin Meteorological Bureau
2024
Ningxia University
2024
Henan Polytechnic University
2024
Dunhuang Research Academy
2024
University of Gothenburg
2024
In this paper, we develop a technique for realizing multi-centimeter-long lithium niobate on insulator (LNOI) waveguides with propagation loss as low 0.027 dB/cm. Our relies patterning chromium thin film coated the top surface of LNOI into hard mask femtosecond laser followed by chemo-mechanical polishing structuring waveguides. The roughness was determined an atomic force microscope to be 0.452 nm. approach is compatible other technologies, such optical and electron beam lithographies or...
Abstract Snow and frozen soil are important factors that influence terrestrial water energy balances through snowpack accumulation melt freeze‐thaw. In this study, a new land surface model (LSM) with coupled snow physics was developed based on hydrologically improved LSM (HydroSiB2). First, an energy‐balance‐based three‐layer incorporated into HydroSiB2 (hereafter HydroSiB2‐S) to provide description of the internal processes pack. Second, universal simplified HydroSiB2‐S depict freezing...
Abstract Monitoring changes in river runoff at the Third Pole (TP) is important because rivers this region support millions of inhabitants Asia and are very sensitive to climate change. Under influence change intensified cryospheric melt, has changed markedly TP, with significant effects on spatial temporal water resource distribution that threaten supply food security for people living downstream. Despite some situ observations discharge estimates from state-of-the-art remote sensing...
A new technique for time-stamping bunches of electrons with terahertz pulses allows the electron arrival time to be recorded 1.5-fs accuracy, paving way greatly improved resolution in apparatuses that probe ultrafast, atomic-scale processes.
Particle accelerators that use electromagnetic fields to increase a charged particle's energy have greatly advanced the development of science and industry since invention. However, enormous cost size conventional radio-frequency limited their accessibility. Here, we demonstrate miniaccelerator powered by terahertz pulses with wavelengths 100 times shorter than pulses. By injecting short relativistic electron bunch 30-mm-long dielectric-lined waveguide tuning frequency 20-period pulse...
Abstract Surface plasmon resonance (SPR) and localized SPR (LSPR) effects have been shown as the principles of some highlysensitive sensors in recent decades. Due to advances nano-fabrication technology, nano-array based on LSPR phenomena widely used chemical bioloical analysis. Sensing with surface-enhanced field sensing for refractive index changes are able identify analytes quantitatively qualitatively. With newly developed ultrasensitive plasmonic biosensors, platforms excellent...
Abstract Nowadays 3D printing has been widely used for producing geometrically complex structures from a broad range of materials such as ceramics, metals, polymers and semiconductors. Although it demonstrated that fabrication resolution high ≈100 nm can be achieved in based on two‐photon polymerization (TPP), the end product height TPP is typically millimeter scale limited by short working distance high‐numerical‐aperture focal lens. Herein, method simultaneous spatiotemporal focusing...
We propose and demonstrate a terahertz (THz) oscilloscope for recording time information of an ultrashort electron beam. By injecting laser-driven THz pulse with circular polarization into dielectric tube, the beam is swept helically such that uniformly encoded angular distribution allows one to characterize both temporal profile timing jitter The dynamic range measurement in configuration significantly increased compared deflection linearly polarized pulse. With this oscilloscope, nearly...
Abstract Cryosphere plays an important role in cold‐region (e.g., Tibetan Plateau) hydrological processes under climate change, and thus cryosphere physics should be carefully represented the modeling. In this study, based on Water Energy Budget‐based Distributed Hydrological Model (WEB‐DHM), we have further improved processes, by incorporating enthalpy‐based coupled snow frozen ground (hereinafter WEB‐DHM‐SF), comprehensively evaluated at upper Yangtze River Basin widespread cover ground....
Soil temperature is a key parameter in the soil–vegetation–atmosphere system. It plays an important role land surface water and energy cycles, has major influence on vegetation growth other hydrological aspects. We evaluated accuracy of soil profiles from Global Land Data Assimilation System (GLDAS) using nine observational networks across world aimed to find reliable global profile dataset for future ecological studies. In general, data generated by Noah model driven GLDAS forcing...
Femtosecond laser induced selective etching (FLISE) of dielectric materials is a promising technique for fabricating various microfluidic devices. Here we experimentally studied the dependence speed in fused silica glass on pulse energy, repetition rate, and inscription using 1030 nm femtosecond laser. The evolution micromorphology inscribed lines was revealed with optical microscopy, scanning electron as well anisotropic diffraction gratings formed by these lines. A single energy threshold...
Abstract Frozen soil undergoing freeze‐thaw cycles has effects on local hydrology, ecosystems, and engineering infrastructure by global warming. It is important to clarify the hydrological processes of frozen soil, especially permafrost. In this study, performance a distributed cryosphere‐hydrology model (WEB‐DHM, Water Energy Budget‐based Distributed Hydrological Model) was significantly improved addition enthalpy‐based permafrost physics. First, we formulated water phase change in...
To improve the processing efficiency and extend tuning range of 3D isotropic fabrication, we apply simultaneous spatiotemporal focusing (SSTF) technique to a high-repetition-rate femtosecond (fs) fiber laser system. In SSTF scheme, propose pulse compensation scheme for with narrow spectral bandwidth by building an extra-cavity stretcher. We further demonstrate truly microfabrication in photosensitive glass tunable resolution ranging from 8 µm 22 using fs pulses. Moreover, systematically...
We report an electro-optic isolator fabricated on thin-film lithium niobate by photolithography-assisted chemo-mechanical etching that shows isolation of 39.50 dB and overall fiber-to-fiber loss 2.6 dB.
Three-dimensional (3D) printing has allowed for the production of geometrically complex 3D objects with extreme flexibility, which is currently undergoing rapid expansion in terms materials, functionalities, as well areas application. When attempting to print microstructures glass, femtosecond laser-induced chemical etching (FLICE)—which a subtractive technique—has proved itself powerful approach. Here, we demonstrate fabrication macro-scale glass large heights up ~3.8 cm an identical...
Lakes on the Tibetan Plateau (TP) have changed dramatically as a result of climate change during recent decades. Studying changes in long-term lake water storage (LWS) is great importance for regional security and ecosystems. Nam Co Lake second largest central TP. To investigate LWS, distributed cryosphere-hydrology model (WEB-DHM) driven by multi-source data was evaluated then applied to simulate hydrological processes across whole basin from 1980 2016. Firstly, comparison runoff (lake...
Materials synthesis in a microfluidic environment enables the flexible and controllable production of various types nanostructures which are great potential fields chemistry, environmental science, bioengineering, medicine. Here, we demonstrate on-chip simultaneous continuous-flow situ spectrum diagnosis zinc oxide (ZnO) nanomaterials using femtosecond-fabricated three-dimensional (3D) microchannel reactor integrated with an array optical fiber probes. The including 3D concentration gradient...
Abstract Snow has been widely recognized as a crucial component of water resources and is expected to be vulnerable climate change in cold mountainous regions. Here we projected impacts on snow hydrology the upper Yellow River (UYR) basin through distributed biosphere hydrological model with improved physics, forced Inter‐Sectoral Impact Model Intercomparison Project outputs under two emission scenarios (representative concentration pathways, RCP4.5 RCP8.5) during period 1996–2025. The...
We report on fabrication of depressed cladding optical waveguides buried in lithium niobate crystal with shaped femtosecond laser pulses. Depressed variable mode-field sizes are fabricated by forming the four sides using a slit-beam shaping technique. show that our technique allows single-mode propagation light polarized both vertical and horizontal directions.
We demonstrate a microfluidic mixer of high mixing efficiency in fused silica substrate using femtosecond laser-induced wet etching and hydroxide-catalysis bonding method. The micromixer has three-dimensional geometry, enabling efficient based on Baker’s transformation principle. cross-sectional area the fabricated was 0.5 × mm2, significantly promotion throughput micromixer. performance micromixers evaluated by up blue yellow ink solutions with flow rate as 6 mL/min.