A5057523962- Laser Material Processing Techniques
- Advanced Surface Polishing Techniques
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Laser-Plasma Interactions and Diagnostics
- Optical Systems and Laser Technology
- Semiconductor Lasers and Optical Devices
- Ocular and Laser Science Research
- Optical measurement and interference techniques
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Solid State Laser Technologies
- Advanced optical system design
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Nonlinear Optical Materials Studies
- Diamond and Carbon-based Materials Research
- Optical Coatings and Gratings
- Optical Coherence Tomography Applications
- Advanced Fiber Laser Technologies
- Phase-change materials and chalcogenides
- Nanoparticle-Based Drug Delivery
- Nanoplatforms for cancer theranostics
- Surface Roughness and Optical Measurements
- Advanced Measurement and Metrology Techniques
First Affiliated Hospital of Jinan University
2025
South China Normal University
2025
Rochester Institute of Technology
2015-2024
Optics Technology (United States)
2024
Zhejiang Lab
2024
Shanxi Medical University
2008-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2023
Centre Lasers Intenses et Applications
2023
Centre National de la Recherche Scientifique
2023
Université de Bordeaux
2023
We report on silicon ablation with a 20 W GHz amplified femtosecond laser source. This novel delivers burst energies up to 400 μJ, providing flexible intra-pulse repetition rates of 0.88 or 3.52 GHz, 200 pulses ∼350 fs pulse duration. High-efficiency, high-quality can be achieved through optimally determining the number pulses, repetition, and average energy within burst. Due such optimization, we demonstrate specific rate 2.5 mm3/min/W containing at which is highest one reported so far for...
To achieve maximum curative effects and minimize side in trimodal synergistic cooperative tumor therapies, we propose a strategy of photothermal (PTT)-chemodynamic (CDT)-coordinated drug chemotherapy (DT) therapy. We designed multifunctional manganese-doped mesoporous magnetic nanodrug carrier (NH2-MMNPs), which was equipped with pullulan oxide to form Schiff base bonds upon loading doxorubicin (DOX), thus creating an oMMNPs/DOX nanoplatform. This nanoplatform exhibits excellent controlled...
OMEGA EP (extended performance) is a petawatt-class addition to the existing 30-kJ, 60-beam Laser Facility at University of Rochester. It will enable high-energy picosecond backlighting high-energy-density experiments and inertial confinement fusion implosions, investigation advanced-ignition such as fast ignition, exploration phenomena. The short-pulse beams have flexibility be directed either target chamber, or new, auxiliary chamber for independent experiments. This paper detail progress...
A robust, computationally efficient modeling method describing multi-pulse femtosecond laser-material interaction is required to determine the optimal laser parameters control and differentiate non-thermal ablation heat accumulation processes for surface structuring welding applications. We establish a three-dimensional, two-temperature model (TTM) heat-accumulation based on classical generation conduction equations evaluate their efficacy efficiency in simulating during processing of...
Introduction: Hypertension is a global health concern and leading risk factor for cardiovascular diseases. Central obesity, marked by abdominal fat, more strongly linked to hypertension than general obesity. Traditional metrics like Body Mass Index (BMI) overlook fat distribution. This study examines the association between Roundness (BRI) Z-score, novel central obesity measure, prevalence in China's middle-aged older adults. Methods: Utilizing data from China Health Retirement Longitudinal...
Temperature-responsive iohexol-loaded microcages demonstrated controlled expansion in a tumor microenvironment ( T > UCST), enabling enhanced local CT imaging.
OMEGA EP is a large-scale laser system that combines optical parametric amplification and solid-state on two beamlines to deliver high-intensity, high-energy pulses. The temporal contrast of the output pulse limited by front-end fluorescence other features are specific amplification. impact two-crystal preamplifier, pump-intensity noise, pump-signal timing experimentally studied. implementation amplifier pumped short pump before stretching, further amplification, recompression enhance described.
Surface processing of silicon using a 400-fs ytterbium fiber laser has been experimentally investigated. Processing was conducted an average power 20 W at repetition rates from 500 kHz – 2 MHz and scanning speeds up to 2.8 mm/s. Samples showed both effective material removal detrimental surface artifacts resulting high temperatures during the ablation process. A numerical model constructed simulate macroscopic heating mechanism in femtosecond processing. The validates experimental results,...
The femtosecond GHz-burst mode laser processing has attracted much attention in the last few years. Very recently, first percussion drilling results obtained glasses using this new regime were reported. In study, we present our latest on top-down glasses, focusing specifically influence of burst duration and shape hole rate quality drilled holes, wherein holes very high with a smooth glossy inner surface can be obtained. We show that decreasing energy repartition pulses within increase rate,...
Two large-aperture tiled-grating (1.5 m) compressors, each consisting of four sets assemblies, have been built for the OMEGA EP high-energy petawatt-class laser system. The techniques used tiling individual assemblies and optimizing overall performance a compressor are described. Both compressors achieved subpicosecond pulse duration without tiling-induced temporal degradation. A ray-tracing model predicted that static wavefront grating tiles dominated focal-spot degradations when...
Freeform optics can reduce the cost, weight, and size of advanced imaging systems, but it is challenging to manufacture complex rotationally asymmetric surfaces optical tolerances. To address need for disruptive, high-precision sub-aperture forming finishing techniques freeform optics, we investigate an alternative, non-contact polishing methodology using femtosecond lasers, combining modeling, experiments, demonstrations. Femtosecond-laser-based germanium was investigated...
The OMEGA EP Laser System was completed in April 2008. It consists of four NIF-like beamlines that will each produce 6.5 kJ per beam at 351 nm. Two the can be configured as high-energy petawatt 2.6 a 10-ps laser pulse. This paper describes current status and some initial experimental results.
This study reports the fabrication and characterization of various configurations mid-infrared waveguides beamsplitters within chalcogenide glass IG2 using ultrafast laser inscription (ULI). Our investigation reveals two distinct regimes ULI modification: weak strong. The strong regime, marked by higher pulse energies, presents darker prominent waveguide morphology, enabling efficient light guiding at 4.55 µm, but with scattering losses shorter wavelengths. In we observed a significant...
Sensors measuring the spatial phase of optical waves are widely used in optics. The differentiation wavefront sensor (ODWS) reconstructs an wave from slope measurements obtained by inducing linear field-transmission gradients far-field. Its dynamic range and sensitivity can be adjusted simply changing gradient slope. We numerically experimentally demonstrate possibility implementing spatially varying transmission using distributions small pixels that either transparent or opaque. Binary...
A dynamic pulse propagation modeling for femtosecond laser bonding of Borofloat glass is presented. The temperature evolution and internal modifications are predicted by incorporating the nonlinear electron dynamics along with dependent thermal properties. modelling predicts spatial temporal distribution absorption coefficient plasma density that gives quantitative estimations heat affected zone weld geometry. impact focusing condition on geometry investigated, which first time to our...
The dynamics of ablation in monocrystalline silicon, from electron-hole plasma generation to material expansion, upon irradiation by a single femtosecond laser pulse (1030 nm, 300 fs duration) at wide range fluences is investigated using time-resolved microscopy technique. reflectivity evolution obtained dynamic images combination with theoretical Drude model and Two-Temperature provides new insights on excitation process. For all fluences, the increased temporary stable state after hundreds...
We demonstrate simultaneous figuring and surface finishing of glass using a femtosecond laser. For the first time, to best our knowledge, we have achieved deterministic material removal with nanometer precision maintained sub-nanometer roughness without inducing any mid-spatial-frequency errors initial surface. A dynamic pulse propagation model is established predict interaction process, including plasma generation temperature. The interactive modeling experiments enable selection set laser...
A grating-inspection system and a damage-analysis method have been developed to measure in situ laser-induced damage on 1.5-m tiled-grating assembly of the OMEGA EP pulse compressor during 15-ps, 2.2-kJ energy ramp. The beam fluence at which significant growth occurred was determined. This is first report versus laser-induced-damage meter-sized multilayer-dielectric-diffraction gratings. result correlated damage-probability measurement conducted small grating sample consistent with fluence,...
Monolithic large-scale diffraction gratings are desired to improve the performance of high-energy laser systems and scale them higher energy, but surface deformation these induce spatio-temporal coupling that is detrimental focusability compressibility output pulse. A new deformable-grating-based pulse compressor architecture with optimized actuator positions has been designed correct spatial temporal aberrations induced by grating wavefront errors. An integrated optical model built analyze...
In this work, unidirectional pulse propagation equation (UPPE) modeling is performed to study the nonlinear laser-mater interaction in silicon and Nd:Y3Al5O12 (Nd:YAG) crystals. The simulation results are validated with reported experimental for applied Nd:YAG crystals validation. Stress-induced waveguides written using 515 nm, 300 fs pulses at a 1 kHz repetition rate. Waveguides having mean loss of 0.21 ± 0.06 dB/cm obtained, which lower than previous values Type-II consistently show that...
A high-density wavelength division demultiplexer (DEMUX) capable of demultiplexing eight-channel 200-GHz optically spaced signals into a 62.5-µm multimode-fiber array is reported. The range operation from 1549.32 to 1560.61 nm within the International Telecommunication Union grid. measured accuracy 0.04 nm. mean insertion loss this DEMUX 1.95 dB. Thermal analysis and temperature testing results are test cycling 20 °C 60 indicates that thermal drift less than 0.8 pm/°C. Adjacent cross talk be...