Results 11 to 20 of about 7,503 (250)

Beam shaping techniques for pulsed laser ablation in liquids: Unlocking tunable control of nanoparticle synthesis in liquids [PDF]

Beilstein Journal of Nanotechnology
Nanoparticle synthesis via pulsed laser ablation in liquids has gained prominence as a versatile and environmentally friendly approach for producing ligand-free colloids with controlled composition, size, and morphology.
Sergio Molina-Prados, Nadezhda M. Bulgakova, Alexander V. Bulgakov, Jesus Lancis, Gladys Mínguez Vega, Carlos Doñate-Buendia   +5 more
doaj   +2 more sources

Dynamically reprogrammable nonlinear Pancharatnam–Berry phase via ferroelectric nematic liquid crystals: a new paradigm for reconfigurable nonlinear optics [PDF]

Light: Science & Applications
A dynamically programmable, nonlinear beam-shaping and steering system is demonstrated, based on photopatterned, electrically controlled, ion-doped liquid ferroelectrics.
Shuang Zhang
doaj   +2 more sources

A hybrid analytical–optimization framework for sidelobe suppression and beamwidth control in linear antenna arrays [PDF]

Scientific Reports
This paper presents a novel hybrid analytical–optimization framework for sidelobe suppression and beamwidth control in uniform linear antenna arrays (ULAAs). The primary objective is to achieve significant sidelobe level (SLL) reduction while maintaining
Ahmed M. Elkhawaga, Mohamed Aboualalaa, Mustafa M. Abd Elnaby   +2 more
doaj   +2 more sources

Tunable Chiral Terahertz Wave Absorption and Beam Manipulation Based on Vanadium Dioxide Metasurfaces [PDF]

Nanomaterials
Chiral metasurfaces exhibit enormous potential in optical applications, and their integration with phase-change material vanadium dioxide (VO2) provides a novel pathway for dynamic regulation.
Li Luo, Boyu Chen, Jie Li, Yi Zheng, Jin He, Yuanyuan Lv, Lin Liu, Cheng Chen, Jialuo Ding, Xiang Yan, Junqi Chen, Tian Tian, Zhe Zhao, Zhanyi Lin, Menghan Chen, Lin Liang, Jianquan Yao   +16 more
doaj   +2 more sources

Beam Shaping in Laser Powder Bed Fusion: Péclet Number and Dynamic Simulation

Metals, 2022
A uniform distribution of power density (energy flux) in a stationary laser beam leads to a decrease in the overheating of the material in the center of the laser beam spot during laser powder bed fusion and a decrease in material losses due to its ...
Sergey N. Grigoriev, Andrey V. Gusarov, Alexander S. Metel, Tatiana V. Tarasova, Marina A. Volosova, Anna A. Okunkova, Andrey S. Gusev   +6 more
doaj   +1 more source

Understanding the Changed Mechanisms of Laser Beam Fusion Cutting by Applying Beam Oscillation, Based on Thermographic Analysis

Applied Sciences, 2021
The latest research on applying beam oscillation in laser beam fusion cutting revealed significant process improvements regarding speed and quality.
Thomas Pinder, Cindy Goppold
doaj   +1 more source

1-Bit Transmission-Type Digital Programmable Coding Metasurface with Multi-Functional Beam-Shaping Capability for Ka-Band Applications

Micromachines, 2023
Digital programmable coding metasurfaces (DPCMs) have recently attracted enormous attention and have been broadly applied, owing to their ability to manipulate electromagnetic (EM) wave behaviours and programmable multi-functionality.
Aqeel Hussain Naqvi, Duc Anh Pham, Syed Imran Hussain Shah, Sungjoon Lim   +3 more
doaj   +1 more source

Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

Applied Sciences, 2020
The latest research on laser beam fusion cutting (LBFC) with static beam shaping have shown a limitation in the quality of cut parts for thick steel plates (> 6 mm) when using solid state lasers.
Cindy Goppold, Thomas Pinder, Susanne Schulze, Patrick Herwig, Andrés Fabián Lasagni   +4 more
doaj   +1 more source

Dynamic ultraviolet harmonic beam pattern control by programmable spatial wavefront modulation of near-infrared fundamental beam

Nanophotonics, 2023
The ultraviolet (UV) wavelength regime is attracting increasing attention because of its growing demand in semiconductor lithography, spectroscopy, and imaging applications owing to its high spatial resolution and high photon energy.
Won Seungjai, Choi Seungman, Kim Taewon, Kim Byunggi, Kim Seung-Woo, Kim Young-Jin   +5 more
doaj   +1 more source

Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics, 2021
In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image.
Di Wang, Yi-Wei Zheng, Nan-Nan Li, Qiong-Hua Wang   +3 more
doaj   +1 more source