A5101977145- Laser-induced spectroscopy and plasma
- Analytical chemistry methods development
- Mercury impact and mitigation studies
- Mass Spectrometry Techniques and Applications
- Cultural Heritage Materials Analysis
- Recycling and Waste Management Techniques
- Microplastics and Plastic Pollution
- Astrophysics and Star Formation Studies
- Ion-surface interactions and analysis
- Stellar, planetary, and galactic studies
- Graphene and Nanomaterials Applications
- Semiconductor Quantum Structures and Devices
- Photonic Crystals and Applications
- Astronomy and Astrophysical Research
- Biosensors and Analytical Detection
- Photonic and Optical Devices
Qingdao National Laboratory for Marine Science and Technology
2020-2021
Ocean University of China
2014-2020
Lawrence Berkeley National Laboratory
2017-2018
The exploitation and research of deep-sea hydrothermal vent has been an issue great interest in ocean recent years. Laser-induced breakdown spectroscopy (LIBS) potential for application due to the capabilities stand-off, multiphase, multielement analysis. In this work, a newly developed compact 4000 m rated LIBS system (LIBSea) is introduced with preliminary results sea trials. underwater consists Nd:YAG single-pulsed laser operating at 1064 nm, optical fiber spectrometer, optics module,...
Laser focusing geometry effects on plasma emissions in bulk water were investigated with five angles ranging from 11.9° to 35.4°. Fast imaging and space-resolved spectroscopy techniques used observe the emission distributions fluctuations. We demonstrated that by increasing angle, discrete irregular formed multiple sites could be turned into continuous stable single core fixed at laser focal point. This indicates key role of angle stabilization positions, which is crucial improvement...
Temporal and spatial evolutions of the laser-induced plasma in bulk water are investigated using fast imaging emission spectroscopic techniques. By tightly focusing a single-pulse nanosecond Nd: YAG laser beam into water, we generate strongly expanded with high reproducibility. Such strong expanding enables us to obtain well-resolved spectral lines by means position-selective detection; hence, time-gated detector becomes abdicable. The present results suggest not only possible non-gated...
The influence of laser wavelength on the characteristics laser-induced breakdown spectroscopy (LIBS) in bulk water was investigated by using 532- and 1064-nm lasers. We demonstrated that higher energy does not lead to LIBS signals because strong plasma shielding occurring at high energies, as shown spectroscopic fast imaging results this work. At threshold energies 100% probability, 1064 nm beam could induce a with electron density temperature than 532 beam, which leads signal-to-noise...
With the application of an orthogonal DP-LIBS excitation, when compared to SP-LIBS, significant emission intensity enhancements for a wide range elements were obtained in seawater by using proper shorter interpulse delays.
Deep-sea in situ detection was performed using the developed LIBS system and comprehensive effects of oceanic pressure temperature on underwater were investigated practice.
Laser-induced breakdown spectroscopy (LIBS) has drawn more attention as a new technique for in situ detection of seawater, especially hydrothermal areas. In order to evaluate the focusing geometry effect on laser-induced plasma bulk water, four arrangements were tried out with single lens well double-lens combination. We demonstrated that, same transmission distance combination shorter effective focal length generated condensed plasma, shown by spectroscopic and fast imaging results....
Laser-induced breakdown spectroscopy (LIBS) has attracted extensive attention as a new technique for in-situ marine application. In this work, the influence of deep-sea high pressure environment on LIBS signals was investigated by using compact LIBS-sea system developed Ocean University China chemical analysis seawater. The results from field measurements show that liquid significant effect signals. Higher peak intensity and larger line broadening were obtained increases. By comparing...
Due to plasma quenching caused by the dense water medium, laser-induced breakdown spectroscopy (LIBS) faces challenges such as strong continuous background radiation and weak broadened characteristic spectral lines when directly detecting metal elements in liquids. In this work, we introduced a simple approach improve underwater LIBS signals with solid substrate-assisted method, which requires no sample pre-treatment operation thus has potential for
Long nanosecond pulses have been proven to be efficient at enhancing underwater LIBS emission. However, the quantitative analytical capability of long-pulse has yet further revealed. In this work, we investigated spectral characteristics by irradiating with a laser pulse 120 ns duration. The alkali and alkaline earth metals Li, K Ca transition element Mn were selected for analysis. It is shown that obvious self-reversal structures observed in spectra high concentrations, making calibration...
With the hope of applying LIBS to solid target detection in deep-sea, influences laser focus sample distance (LFTSD) on plasma characteristics were investigated using spectra-image approach with energies at sub- and super- threshold irradiance solution. The experimental results show that LFTSD is a critical parameter which can directly influence shapes, by changing fluence surface. divided into two parts under pre-focus condition, while only forms surface Cu de-focus condition. Moreover,...
LAMIS is an all-optical laser-ablation technique for isotope analysis at atmospheric ambient conditions. In this presentation, the theoretical principles of F2-LAMIS will be overviewed and its application remote isotopic discussed.
A hybrid laser diode consisted of Si slab waveguide and III-V ridge has been investigated. This structure is efficient for enhancing the confinement factors in silicon region active simultaneously.