Results 91 to 100 of about 40,178 (256)

Control of Polarization and Polar Helicity in BiFeO3 by Epitaxial Strain and Interfacial Chemistry

Advanced Functional Materials, EarlyView.
In BiFeO3 thin films, the interplay of interfacial chemistry, electrostatics, and epitaxial strain is engineered to stabilize homohelicity in polarization textures at the domain scale. The synergistic use of a Bi2O2‐terminated Aurivillius buffer layer and a highly anisotropic compressive epitaxial strain offers new routes to control the polar‐texture ...
Elzbieta Gradauskaite, Lilia Huynh, Natascha Gray, Quintin N. Meier, Marta D. Rossell, Morgan Trassin   +5 more
wiley   +1 more source

Raman amplification and pulsed lasing in cladding-pumped germanosilicate fiber [PDF]

We report for the first time Raman amplification in a cladding-pumped fiber. The double-clad germanosilicate fiber was pumped by a Q-switched Er-Yb co-doped fiber laser at 1570 nm. The power conversion efficiency was up to 36%, with a slope of 64%
Selvas, R., Hanna, D.C., Nilsson, J., Grudinin, A.B., Sahu, J.K., Jang, J.N.   +5 more
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All-fiber 7x1 signal combiner for incoherent laser beam combining [PDF]

, 2011
We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power.
M. D. Maack, P. M. W. Skovgaard, J. Johansen, F. Becker, Becker, Frank, M. Blomqvist, Lægsgaard, Jesper, Maack, Martin D., D. Noordegraaf, Blomqvist, Mats, S. Belke, Noordegraaf, Danny, J. Laegsgaard, Belke, Steffen, Skovgaard, Peter M. W., Johansen, Jeppe   +15 more
core   +1 more source

Intermediate Resistive State in Wafer‐Scale Vertical MoS2 Memristors Through Lateral Silver Filament Growth for Artificial Synapse Applications

Advanced Functional Materials, EarlyView.
In MOCVD MoS2 memristors, a current compliance‐regulated Ag filament mechanism is revealed. The filament ruptures spontaneously during volatile switching, while subsequent growth proceeds vertically through the MoS2 layers and then laterally along the van der Waals gaps during nonvolatile switching.
Yuan Fa, Milan Buttberg, Ke Ran, Rana Walied Ahmad, Dennis Braun, Lukas Völkel, Jimin Lee, Sofía Cruces, Bart Macco, Bárbara Canto, Holger Lerch, Thorsten Wahlbrink, Holger Kalisch, Michael Heuken, Andrei Vescan, Joachim Mayer, Zhenxing Wang, Ilia Valov, Stephan Menzel, Max C. Lemme   +19 more
wiley   +1 more source

Speckle-Metric-Optimization-Based Adaptive Optics for Laser Beam Projection and Coherent Beam Combining [PDF]

, 2012
Maximization of a projected laser beam’s power density at a remotely located extended object (speckle target) can be achieved by using an adaptive optics (AO) technique based on sensing and optimization of the target-return speckle field’s statistical ...
Weyrauch, Thomas, Gatz, Micah, Carhart, Gary W., Lachinova, Svetlana, Vorontsov, Mikhail   +4 more
core   +1 more source

Integration of Low‐Voltage Nanoscale MoS2 Memristors on CMOS Microchips

Advanced Functional Materials, EarlyView.
This article presents the first monolithic integration of nanoscale MoS2‐based memristors into the back‐end‐of‐line of foundry‐fabricated CMOS microchips in a one‐transistor‐one‐resistor (1T1R) architecture. The MoS2‐based 1T1R cells exhibit forming‐free, nonvolatile resistive switching with ultra‐low operating voltages, low cycle‐to‐cycle variability ...
Jimin Lee, Sofía Cruces, Xiaohua Liu, Yang Chen, Vasilis A. Maroufidis, Janghyun Jo, Lukas Völkel, Dennis Braun, Michael Möller, Leon Brackmann, Holger Kalisch, Michael Heuken, Andrei Vescan, Rafal E. Dunin‐Borkowski, Joachim Mayer, Stefan Wiefels, Max C. Lemme   +16 more
wiley   +1 more source

High-Power Narrow-Linewidth Tunable 670.8-nm Master Oscillator Power Amplifier With High Efficiency

IEEE Photonics Journal, 2017
A highly efficient 670.8-nm high-power narrow-linewidth wavelength-tunable laser source with master oscillator power amplifier structure is demonstrated, which yielded CW output power of 4.5 W with spectral linewidth of 0.3 pm and mode-hop free tuning ...
Hao Wu, Hangyu Peng, Jun Zhang, Jinlong Zhang, Hongbo Zhu, Yongqiang Ning   +5 more
doaj   +1 more source

Mechanical Behavior and Fracture Mechanisms of MXene/PVDF Nanocomponsites: In Situ Characterization and Multiscale Analysis

Advanced Functional Materials, EarlyView.
Multiscale experiments and modeling reveal how Ti3C2Tx MXene nanosheets reinforce PVDF nanocomposites. An optimal MXene loading (∼1 wt.%) nearly doubles tensile strength through efficient stress transfer, flake alignment, and crack‐deflection mechanisms, transforming ductile polymer behavior into a controlled multi‐stage fracture pathway which aligns ...
Bita Soltan Mohammadlou, James FitzPatrick, Li Meng, Kateryna Shevchuk, Ahmad Najafi, Yury Gogotsi   +5 more
wiley   +1 more source

Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy

Materials & Design
Laser beam shaping technology has advanced remote laser welding applications, yet welding AA6xxx alloys remains challenging due to their sensitivity to cracking.
Venkat Vivek Pamarthi, Tianzhu Sun, Abhishek Das, Qamar Hayat, Alexander Griffiths, Lewis Johnson, Pasquale Franciosa   +6 more
doaj   +1 more source

Coherent Beam Combining of 1 um DFB Laser Based on Adaptive Optics Control [PDF]

, 2021
A 1-µm DFB laser monolithically integrated with 1×2 MMI and SOAs has been demonstrated with a stable lasing wavelength. Coherent beam combining using adaptive control of the outputs is demonstrated, showing good agreement with ...
Dong, Lizhi, Marsh, John H., Tan, Yi, Zhu, Licheng, Liang, Song, Huang, Yongguang, Eddie, Iain, Hou, Lianping, Ye, Shengwei, Lai, Baiheng, Hou, Bin   +10 more
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