A5064619178- Advanced Fiber Optic Sensors
- Laser Material Processing Techniques
- Photonic and Optical Devices
- Ocular and Laser Science Research
- Advanced Fiber Laser Technologies
- Laser-induced spectroscopy and plasma
- Surface Roughness and Optical Measurements
- Advanced Surface Polishing Techniques
- Spectroscopy and Laser Applications
- Diamond and Carbon-based Materials Research
- Optical Systems and Laser Technology
- Multiferroics and related materials
- Ion-surface interactions and analysis
- Ferroelectric and Piezoelectric Materials
- Laser Design and Applications
- Fluid Dynamics and Heat Transfer
- Particle Dynamics in Fluid Flows
- Tactile and Sensory Interactions
- Metal Alloys Wear and Properties
- Advanced Sensor and Energy Harvesting Materials
- Bacterial Identification and Susceptibility Testing
- Numerical methods in engineering
- Optical Network Technologies
- Metallurgical Processes and Thermodynamics
- Mechanical stress and fatigue analysis
China Academy of Engineering Physics
2017-2025
Laser Fusion Research Center
2021-2024
Laser Research Institute
2021-2024
Wuhan University of Technology
2017
Lanzhou University
2014
In this study, micro-pit and microgroove anti-reflective structures were fabricated on the titanium alloy by general controllable femtosecond (fs) laser-direct-writing (LDW) strategies. Energy-dispersive spectroscopy (EDS) temperature cycling test (TCT) results showed that surface was oxidized its thermostability excellent. The improved anti-reflection performance due to combined effect of scattering rough surfaces light trapping absorption property. An efficient achieved in infrared (IR)...
A high sensitivity refractive index sensor based on a single mode-small diameter no core fiber structure is proposed. In this structure, small (SDNCF) used as probe, was fusion spliced to the end face of traditional mode (SMF) and SDNCF coated with thin film gold provide reflective light. The influence length has been investigated by both simulations experiments, where results show that significant influence. However, limited sensitivity. Experimental 327 nm/RIU (refractive unit) achieved...
A polarization-dependent all-fiber comb filter based on a combination effect of multimode interference and Mach-Zehnder interferometer was proposed demonstrated. The composed with short section fiber (MMF) fusion spliced conventional single mode the one side different type optical other side. second is to MMF properly designed misalignment. Different types lengths fibers were used investigate influence performance filter. Experimentally, several filters free spectral range (FSR) values...
Based on a linear piezoelectric constitutive relation and nonlinear magnetostrictive relation, magnetoelectric (ME) effect model for lead zirconate titanate (PZT)/Terfenol-D nanobilayer substrate has been developed. In this study, the ME coefficients at bending mode two cases (without surface stress with stress) are calculated by using Gurtin-Murdoch theory. The difference between influence of residual tension discussed. At same time, clamping is studied altering thickness ratio selecting...
Stretchable optical fiber sensors (SOFSs), which are promising and ultra-sensitive next-generation sensors, have achieved prominent success in applications including health monitoring, robotics, biological-electronic interfaces. Here, we report an multi-functional micro/nanofiber embedded with a flexible polydimethylsiloxane (PDMS) membrane, is compatible wearable sensors. Based on the effect of strong evanescent field, as-fabricated SOFS highly sensitive to strain, achieving high...
Magnetoelectric (ME) effect in a Ni/PZT/Terfenol-D composite cantilever was tested under three different magnetic loading modes. The frequency-dependent ME and dual-peak phenomenon were observed the experiment. influence of orientations fields on coupling investigated. Magnetic field distribution inside structure simulated, which agrees well with experimental data. experiment results indicate that coefficient versus bias curve presents novel near resonant frequency, depends upon amplitude...
The damage of large-aperture optical components caused by organic contamination limits the performance improvement high-power laser facilities. We propose an in situ plasma cleaning technology to remove contaminants on components, demonstrated simulated equipment. characteristics equipment were investigated spectral diagnosis. capability coefficient was defined evaluate Then diffusion properties reactive species along surface elucidated under various charge parameters, including powers,...
The nano-metric cutting process of single-crystal SiO 2 was studied using molecular dynamics simulation, where the effects anisotropy on material removal and surface integrity were analyzed. typical crystal directions different planes selected as directions. results show that chip formation, temperature distribution in machined area, force, phase transformation damage layer thickness vary according to direction. orientation (110) [00−1] exhibits a large range expansion while [1−10] smallest...
A high temperature-sensitive long-period fiber grating (LPFG) sensor fabricated by the local fictive temperature modification is proposed and demonstrated. High-frequency CO 2 laser pulses scan standard single-mode (SMF), zones extended to core of SMF. Experimental results demonstrate that LPFG sensors with 600 μ m period 32 numbers offer average sensitivity 0.084 nm/C in range room (RM) 875°C. The LPFGs here show exponential change terms spectral wavelength shift versus changes temperature....
The impact of airborne molecular contaminants (AMCs) on the lifetime fused silica UV optics in high power lasers (HPLs) is a critical issue. In this work, we demonstrated on-line monitoring method AMCs concentration based Sagnac microfiber structure. experiment, loop with mesoporous coating was fabricated by microheater brushing technique and dip coating. physical absorption results modification surrounding refractive index (RI). By spectral shift wavelength domain, proposed structure can...
This study examines the laser-stricken damage to different alumina ceramic surfaces of roughness through multi-physical field coupling simulations and laser-striking experiments. The morphologies can be described by waves frequencies amplitudes, which are discretized rectangular microstructures heights. In this paper, we found that reaction gauss lasers stricken on them could simulated heights laser strike. simulation was carried out method. distribution temperature stress microstructure...
Cleanliness control is one of the most important processes for final optics assembly (FOA) in high-power laser systems. In this paper, an “Ultra Clean Manufacturing (UCM)” concept put forward first time to satisfy cleanliness requirements FOA. First, challenges and FOA are introduced UCM proposed. Significant surface cleaning technologies mechanical parts then expounded. Finally, techniques, such as “gas knife” “laser cleaning”, developed online methods
The cleaning mechanism of optical surface particle contaminants in the light pneumatic tube was simulated based on static equations and JKR model. Cleaning verification experiment air knife sweeping system on-line monitoring high power laser facility set up order to verify results. Results showed that removal ratio is significantly influenced by velocity angle. can reach 94.3% using higher input pressure knife, demonstrating technology useful for maintaining cleanliness elements, thus...
The incidence of scarlet fever cases remains high in China. Here, we report the complete genome sequence a Streptococcus pyogenes isolate serotype M12, which has been confirmed as predominant recent outbreaks. Genome sequencing was achieved by combination Oxford Nanopore MinION and Illumina methodologies.
A novel chemical sensing approach detecting airborne molecular contaminants (AMCs) or compounds is demonstrated by using single-mode optical microfibre (OMF) coated with hollow silica nanoparticles (HSNs). The concentration of AMCs, which were volatilized on the surface tapered HSNs, influences transmission loss microfibre. Tapered OMF was fabricated a high-precision electrically controlled setup, and coatings HSNs prepared meniscus coating method. three OMFs different diameters same thick...
Thermal ablation is quite a complex process in high energy continuous wave (CW) laser facility, and it crucial to understand the damage mechanism for stable operation of system. In this paper, we observe behavior contaminants-induced via self-build optics testing platform. The waveband optical coatings (Ta2O5 SiO2) under test dedicated infrared. Based on 100kW level infrared CW laser, thermal substrate caused by typical surface contaminants (iron micro-particle) recorded, which shows...
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Wettability of metal surfaces is used to characterise the surface cleanliness components in inertial confinement fusion (ICF) facility. In this work, molecular simulations combined with wettability experimentation were performed. The temperature effects water-metallic interface energies and their influence on measurements for investigated. simulation results indicated van der Waals forces promoted attraction between water molecules surfaces. interaction raised elevated temperatures from 291...
Introduction: Based on microfibers with sol–gel film, this study focuses developing an organic contaminant sensing device to monitor airborne contamination in high-power laser facilities. Methods: The heightened the sensitivity external environment nano-structure of microfiber surface. relationship between additional transmission power loss caused by contaminants and filling rate porosity film was discussed. In addition, we obtained refractive index microstructure. Results: experimental...
Particulate contaminants are common damage precursors on optics in the daily operation of high laser power systems. In this paper, behaviors silica particles attached to front and back surfaces fused under irradiation a 355 nm were studied. Results showed that surface tend splash severely fluence, while particle forms large laser-induced shallow pit (LSP)-like substrate. Different morphologies observed, mechanisms also proposed.
Surfaces of polycrystalline Al samples were treated by using electropolishing, etching or mechanical polishing methods. Surface morphologies, laser-induced damage thresholds (LIDTs) and ejected particle numbers different analyzed compared. Results showed that several surface morphologies prepared. A new electropolishing technique was developed an improvement 95% LIDT obtained this method. Ejected monitored compared to investigate their damage-resistant properties. The from the...
Aerosol particle contamination in high-power laser facilities has become a major cause of internal optical component damage resistance and service life reduction. In general, contaminating particles primarily originate from stray light; therefore, it is crucial to investigate the mechanism dynamics dynamic generation control cleanliness level. this study, corresponding research was conducted on experiments theory. We investigated surface composition modification under action laser. employed...