Results 21 to 30 of about 5,781,485 (283)

AlGaAs converters and arrays for laser power beaming [PDF]

AIP Conference Proceedings, 2015
This study reports on the development of AlGaAs/GaAs-based laser power photovoltaic (PV) converters fabricated by LPE. The monochromatic (λ = 809 nm) conversion efficiency up to 58% is measured for cells with p-n junction in Al0.07Ga0.93As and low (x = 0.25-0.3) Al concentration ‘window’.
Vladimir Khvostikov, Svetlana Sorokina, Nataliia Potapovich, Olga Khvostikova, Maxim Shvarts, Nailya Timoshina, Viacheslav Andreev   +6 more
openaire   +1 more source

High power diode lasers converted to the visible [PDF]

2017 IEEE High Power Diode Lasers and Systems Conference (HPD), 2017
High power diode lasers have in recent years become available in many wavelength regions. However, some spectral regions are not well covered. In particular, the visible spectral range is lacking high power diode lasers with good spatial quality. In this paper, we highlight some of our recent results in nonlinear frequency conversion of high power near
Jensen, Ole Bjarlin, Hansen, Anders Kragh, Andersen, Peter E., Christensen, Mathias, Müller, André, Tawfieq, Mahmoud, Sumpf, Bernd, Petersen, Paul Michael   +7 more
openaire   +3 more sources

High-performance laser power converts for direct-energy applications

Optics Express, 2022
Six-junction GaAs laser power converts (LPCs) were designed and fabricated. Each subcell is vertically connected by p++-AlGaAs: C/n++-AlGaAs: Si: Te (1:2) tunnel junction with good thermal stability and a record peak tunneling current density of 1867 A/cm 2 .
Yudan Gou, Hao Wang, Jun Wang, Ruijun Niu, Xiangliu Chen, Bangguo Wang, Yao Xiao, Zhicheng Zhang, Wuling Liu, Huomu Yang, Guoliang Deng   +10 more
openaire   +2 more sources

Possible explanations for different surface quality in laser cutting with 1 micron and 10 microns beams [PDF]

, 2012
In laser　cutting　of　thick　steel　sheets,　quality　difference　is　observed　between　cut　surfaces　obtained　with 1 micron and 10 micron laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength ...
Remy Fabbro, Koji Hirano, FABBRO, Rémy, HIRANO, Koji   +3 more
core   +1 more source

High-current contactless ferromagnetic converters for multi-profile monitoring and control systems [PDF]

E3S Web of Conferences, 2023
The article shows that the undesirability of breaking the current circuit for the temporary inclusion of electrical measuring devices, the presence of large power losses on shunts, the impossibility of breaking the circuit under the conditions of the ...
Plakhtiev Anatoliy, Gaziev Gayratjon, Doniyorov Odil, Muradov Khayot   +3 more
doaj   +1 more source

Power-scalable Ho:YAG slab laser intracavity side-pumped by a Tm:YLF slab laser [PDF]

, 2006
We report the first demonstration of an intracavity side-pumped Ho:YAG slab laser, delivering 13W at 2.09µm and discuss the advantages of this scheme as an approach for power ...
Shepherd, David, Betterton, John G., D. P. Shepherd, E. K. Gorton, Mackenzie, Jacob, S. So, So, Sik, J. A. C. Terry, J. I. Mackenzie, Clarkson, W. Andrew, W. A. Clarkson, Gorton, Eric K., Terry, John A.C., J. G. Betterton   +13 more
core   +2 more sources

High-Efficiency Pulse Width Modulation-Based Wireless Laser Power Transmission Step-Down System

IEEE Photonics Journal, 2020
Wireless laser power transmission is a promising technique in the far-field wireless power supply with the advantages of high-power density, and small transmitter and receiver sizes.
Yunshi Wang, Changming Zhao, Liwei Zhang, Chun Liu, Jian Li   +4 more
doaj   +1 more source

Electron cyclotron converters of microwaves in wireless power transmission systems

RUDN Journal of Engineering Research, 2020
A proposal to use special electron cyclotron devices as effective converters of electromagnetic waves into direct current in modern microwave systems for wireless transmission of electrical energy to the Earth via a microwave channel from solar space ...
Yury A. Pirogov, Gohar M. Kazaryan, Vladimir L. Savvin   +2 more
doaj   +1 more source

Photogeneration and Performance Optimization (PhPO): A New Algorithm to Improve the Performance of Vertical Epitaxial Hetero-Structure Architecture Laser Power Converters

IEEE Access, 2023
The state of the art in the field of high-power laser transmission is dominated by the so called Vertical Epitaxial Hetero-Structure Architecture (VEHSA), which consists of monolithically stacking p/n cells connected by tunnel junctions.
Javier F. Lozano, Natalia Seoane, Enrique Comesana, Florencia M. Almonacid, Eduardo F. Fernandez, Antonio Garcia-Loureiro   +5 more
doaj   +1 more source

Supercapacitor assisted LDO (SCALDO) techniquean extra low frequency design approach to high efficiency DC-DC converters and how it compares with the classical switched capacitor converters [PDF]

, 2013
Supercapacitor assisted low dropout regulators (SCALDO) were proposed as an alternative design approach to DC-DC converters, where the supercapacitor circulation frequency (switching frequency) is in the order of few Hz to few 10s of Hz, with an output ...
Nihal Kulatana, Kankanamge, Kosala, Kularatna, Nihal, Kosala Kankanmage, Kulatana, Nihal, Kankanmage, Kosala   +5 more
core   +1 more source