Results 71 to 80 of about 2,360,851 (277)

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

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

Influence of Scan Strategies in Electron Beam Powder Bed Fusion on Solidification, Microstructure, and High‐Temperature Compressive Properties of γ′‐Strengthened Inconel 738LC

Advanced Engineering Materials, EarlyView.
Experiments and thermophysical simulations were conducted to investigate the electron beam powder bed fusion electron beam (PBF‐EB/M) process for the γ′‐strengthened nickel‐based superalloy Inconel 738LC. The results demonstrate the impact of process‐induced microstructural variations on high‐temperature mechanical behavior, providing a basis for ...
Jan Niklas Petenati, Karthik Kumar Banku, Prasanth Bondi, Ivan Zhirnov, Yangyiwei Yang, Gordon Schmidt, Jürgen Christen, Georg Hasemann, Manja Krüger, Bai‐Xiang Xu, Bilal Gökce, Silja‐Katharina Rittinghaus   +11 more
wiley   +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

Laser requirements for a laser fusion energy power plant

High Power Laser Science and Engineering, 2013
We will review some of the requirements for a laser that would be used with a laser fusion energy power plant, including frequency, spatial beam smoothing, bandwidth, temporal pulse shaping, efficiency, repetition rate, and reliability.
Stephen E. Bodner, Andrew J. Schmitt, John D. Sethian   +2 more
doaj   +1 more source

Wavelength-independent laser beam shaping [PDF]

SPIE Proceedings, 2010
This paper presents a beam shaping device namely, a Diffractive Optical Element (DOE), which is used to change a beam having a Gaussian intensity profile into a beam with a uniform intensity profile. The DOE used in this work was fabricated from ZnSe and its performance was evaluated using a cw CO 2 laser.
Mapule P. Degama, Andrew Forbes
openaire   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

A Segmented Hybrid Algorithm for Beam Shaping Combining Iterative and Simulated Annealing Approaches

Photonics
In recent years, laser technology has made significant advancements, yet there are specific requirements for the energy concentration and uniformity of lasers in various fields, such as optical communication, laser processing, 3D printing, etc.
Xiaoyu Zhang, Qi Zhang, Genxiang Chen
doaj   +1 more source

Free electron laser and microwave instability interplay in a storage ring

Physical Review Special Topics. Accelerators and Beams, 2004
Collective effects, such as the microwave instability, influence the longitudinal dynamics of an electron beam in a storage ring. In a storage ring free electron laser (FEL) they can compete with the induced beam heating and thus be treated as a further ...
G. L. Orlandi, C. Bruni, D. Garzella, M. E. Couprie, C. Thomas, R. Bartolini, C. Rippon, G. Dattoli   +7 more
doaj   +1 more source

Investigating the Effect of Inclination Angle and the Influence of Scan Parameters on the Appearance and Thermal and Mechanical Properties of Filigree Tension Rods of LPBF‐Manufactured NiTi Shape‐Memory Alloys

Advanced Engineering Materials, EarlyView.
This article investigates the dependence of the properties on the manufacturing orientation in the form of the inclination angle to the build plate of LPBF‐fabricated NiTi rods with a diameter of 150–220 µm. Metallographic, chemical, thermal, and mechanical characterization show behavior under identical manufacturing conditions that ranges from ...
Sandra Herzig, Michael Werner, Christian Rotsch   +2 more
wiley   +1 more source