Results 41 to 50 of about 8,680 (259)

Beam Shaping by Mode Superposition With Coefficient Optimization

IEEE Photonics Journal
Beam shaping is of significance for applications in various fields, including laser fusion, laser processing, and optical manipulation. One conventional approach for beam shaping is using the superposition of eigenmodes, such as the Hermite-Gaussian (HG)
Guowen Zhang, Hang Sun, Ziyang Chen, Yanli Zhang, Jixiong Pu, Jianqiang Zhu   +5 more
doaj   +1 more source

High-power fiber lasers for photocathode electron injectors

Physical Review Special Topics. Accelerators and Beams, 2014
Many new applications for electron accelerators require high-brightness, high-average power beams, and most rely on photocathode-based electron injectors as a source of electrons.
Zhi Zhao, Adam Bartnik, Frank W. Wise, Ivan V. Bazarov, Bruce M. Dunham   +4 more
doaj   +1 more source

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source

A Knowledge‐Based Approach for Understanding and Managing Additive Manufacturing Data

Advanced Engineering Materials, EarlyView.
Additive manufacturing processes generate a large amount of data. Effectively managing, understanding, and retrieving information from this data remains a major challenge. Therefore, we propose an ontology‐based approach to integrate heterogeneous data, enable semantic queries, and support decision‐making.
Mina Abd Nikooie Pour, Prithwish Tarafder, Anton Wiberg, Huanyu Li, Johan Moverare, Patrick Lambrix   +5 more
wiley   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

Affecting the Properties of Copper–Graphene Electroconductive Composite by Severe Plastic Deformation

Advanced Engineering Materials, EarlyView.
Copper‐based composites enhanced with carbon feature convenient mechanical properties and favorable electric conductivity. Processing via deformation and thermomechanical treatments can introduce advantageous microstructures further enhancing their performance. Herein, copper–graphene powder‐based composites are directly consolidated via rotary swaging
Radim Kocich, Lenka Kunčická, Pavel Czernek, Zifan Wang   +3 more
wiley   +1 more source

Adaptive beam-shaping enabled high-precision patterned laser micro-grooving

International Journal of Extreme Manufacturing
Microgrooves with diverse cross-sections are required in various fields but remain a significant challenge in precision machining, especially for hard-to-machine materials.
Pei Qiu, Jun Li, Dandan Yuan, Zixuan Xin, Jiaxu Huang, Shaolin Xu   +5 more
doaj   +1 more source

Advancing laser powder bed fusion of metals via tailored laser beam shaping: A critical review

Materials & Design
Laser beam shaping is increasingly explored to enhance Laser Powder Bed Fusion of Metals (PBF-LB/M) by controlling the spatial energy distribution within the laser spot.
Abid Ullah, Kashif Azher, Tingting Liu, Philipp Kohlwes, Dirk Herzog, Reshad Bakhtari, Alexander E. Medvedev, Asif Ur Rehman, Kai Zhang, Andrey Molotnikov, Ingomar Kelbassa, Milan Brandt   +11 more
doaj   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Electrically Tunable Generation of Vector Beams via Integrated Liquid Crystal Plates and Dielectric Metasurface

IEEE Photonics Journal
The generation and modulation of vector beams typically require mechanical adjustments of optical components, leading to a complex setup and long manipulation times.
Ruisi Wang, Kaishuo Zhang, Jing Wei, Wei Zhao   +3 more
doaj   +1 more source