Results 51 to 60 of about 7,684 (263)

Optical Vortex-Enhanced LIBS: Signal Improvement and Precise Classification of Coal Properties with Machine Learning

Applied Sciences
Laser-induced breakdown spectroscopy (LIBS), limited by matrix effects, self-absorption in complex samples, and ambient atmospheric influences, still requires further improvement in detection sensitivity and signal stability. In this work, the excitation
Yuxia Zhou, Abulimiti Yasen, Jianqiang Ye, Palidan Aierken, Bumaliya Abulimiti, Mei Xiang   +5 more
doaj   +1 more source

Inversion of a guided optical vortex

, 2006
We demonstrate, both theoretically and experimentally, the inversion of the topological charge of a vortex that propagates through an optical fiber.
Salgueiro, J. R., Ferrando, A., Carpentier, A. V., Doval, S., Michinel, H.   +4 more
core   +1 more source

Observations of meteoric material and implications for aerosol nucleation in the winter Arctic lower stratosphere derived from in situ particle measurements [PDF]

, 2005
Number concentrations of total and non-volatile aerosol particles with size diameters >0.01 μm as well as particle size distributions (0.4–23 μm diameter) were measured in situ in the Arctic lower stratosphere (10–20.5 km altitude). The measurements were
Curtius, Joachim, A. Roiger, C. Schiller, Werner, Anja, Werner, A., Vössing, H. J., Krebsbach, Michael, Schlager, H., Weigel, Ralf, Volk, Michael, Roiger, A., Roiger, Anke, M. Krebsbach, S. Borrmann, Volk, C.-Michael, Werner, Anja Sabine, Weigel, R., Wernli, H., Dreiling, Volker, A. Werner, Schiller, Cornelius, H. Wernli, C.-M. Volk, Vössing, H.-J., Schiller, C., P. Konopka, Borrmann, Stephan, Curtius, J., Dreiling, V., H.-J. Vössing, Vössing, Hermann-Josef, J. Curtius, R. Weigel, Borrmann, S., Krebsbach, M., J. Curtius, Volk, C.-M., Konopka, P., V. Dreiling, Bormann, Stephan, Volk, C. M., Konopka, Paul, Vössing, Hermann, H. Schlager, Schlager, Hans, Wernli, Heini   +45 more
core   +1 more source

Optical vortex-induced forward mass transfer: manifestation of helical trajectory of optical vortex

Optics Express, 2019
The orbital angular momentum of an optical vortex field is found to twist high viscosity donor material to form a micron-scale 'spin jet'. This unique phenomenon manifests the helical trajectory of the optical vortex. Going beyond both the conventional ink jet and laser induced forward mass transfer (LIFT) patterning technologies, it also offers the ...
Ryosuke Nakamura, Haruki Kawaguchi, Muneaki Iwata, Akihiro Kaneko, Ryo Nagura, Satoyuki Kawano, Kohei Toyoda, Katsuhiko Miyamoto, Takashige Omatsu   +8 more
openaire   +3 more sources

Prediction of Surface Topography Parameters in Direct Laser Interference Patterning of Stainless Steel Using Infrared Monitoring and Convolutional Neural Networks

Advanced Engineering Materials, EarlyView.
This study presents an infrared monitoring approach for direct laser interference patterning (DLIP) combined with a convolutional neural network (CNN). Thermal emission data captured during structuring are used to predict surface topography parameters.
Lukas Olawsky, Marcelo Sallese, Leander Kläber, Clemens Kuhn, Keming Du, Andrés Fabián Lasagni   +5 more
wiley   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Ring-broken optical vortices with an adjustable opening

Results in Physics, 2019
A modified helical phase is presented in this paper. The generated vortex beams with the modified helical phases are characterized with ring-broken intensity distributions.
Shubo Cheng, Tian Xia, Mengsi Liu, Yiping Xu, Shan Xu, Shufang Gao, Geng Zhang, Shaohua Tao, Wenxing Yang   +8 more
doaj   +1 more source

Integrated optical vortex beam receivers [PDF]

, 2016
A simple and ultra-compact integrated optical vortex beam receiver device is presented. The device is based on the coupling between the optical vortex modes and whispering gallery modes in a micro-ring resonator via embedded angular gratings, which ...
Meriggi L., Li S., Zhang N., Yu, Siyuan, Gao, Shengqian, Yu S., Cai, Xinlun, Cicek, Kenan, Meriggi, Laura, Nong, Zhichao, Hu Z., Hu, Ziyang, Cicek K., Cai X., Wang X., Zhu, Jiangbo, Nong Z., Gao S., Wang, Xuyang, Sorel M., Sorel, Marc, Zhu J., Li, Shimao, Zhang, Ning   +23 more
core   +1 more source

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

Direction of energy flows at the focus of cylindrical vortex vector beams

Компьютерная оптика
In this work, we show analytically using the Richards-Wolf formalism and through the numerical simulation that at the sharp focus of a circularly polarized optical vortex, three energy flows occur: the direct longitudinal, reverse longitudinal, and ...
V.V. Kotlyar, A.A. Kovalev, A.G. Nalimov, A.M. Telegin   +3 more
doaj   +1 more source