Maximal Output PowEr of Point‐Contact Josephson Junctions

An all-fiberized high-average-power narrow linewidth ns pulsed laser with linear polarization is demonstrated. The laser system utilizes a typical master oscillator power amplifier (MOPA) configuration. The stimulated Brillouin scattering (SBS) is effectively suppressed due to the short fiber length and large mode area in the main amplifier, combined with the narrow pulse duration smaller than the phonon lifetime of SBS effect. A maximal output power of 466 W is obtained with a narrow linewidth of ${\sim}$203.6 MHz, and the corresponding slope efficiency is ${\sim}$80.3%. The pulse duration is condensed to be ${\sim}$4 ns after the amplification, corresponding to the peak power of 8.8 kW and the pulse energy of $46.6~\unicode[STIX]{x03BC}\text{J}$. Near-diffraction-limited beam quality with an $M^{2}$ factor of 1.32 is obtained at the output power of 442 W and the mode instability (MI) is observed at the maximal output power. To the best of our knowledge, this is the highest average output power of the all-fiberized narrow linewidth ns pulsed fiber laser with linear polarization and high beam quality, which is a promising source for the nonlinear frequency conversion, laser lidar, and so on.

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CONTROL OVER THE PERFORMANCE OF MONOCRYSTALLINE SILICON SOLAR CELLS REFERRING TO THE POROUS SILICON LAYER / MONOKRISTALINIO SILICIO SAULĖS ELEMENTŲ CHARAKTERISTIKŲ VALDYMAS AKYTOJO SILICIO SLUOKSNIU

Mokslas - Lietuvos ateitis ◽

10.3846/mla.2011.120 ◽

2012 ◽

Vol 3 (6) ◽

pp. 91-94

Author(s):

Ramūnas Mitkevičius ◽

Viktor Zagadskij ◽

Eugenijus Šatkovskis

Keyword(s):

Solar Cells ◽

Porous Silicon ◽

Output Power ◽

Crystalline Silicon ◽

Silicon Layer ◽

Porous Silicon Layer ◽

Silicon Solar Cells ◽

Crystalline Silicon Solar Cells ◽

Maximal Output Power ◽

Maximal Output

The paper examines the parameters of crystalline silicon solar cells such as fill factor, maximal output power and series resistance forming a porous silicon layer. The obtained results show that introducing the layer into the structure of a solar cell results in a 19 percent enhancement of maximal output power and conversion efficiency. Santrauka Šiame darbe tiriamas akytojo silicio darinių poveikis saulės elementų elektrinėms charakteristikoms: nuosekliajai varžai, voltamperinių charakteristikų formai. Parodyta, kad pagaminus silicio saulės elemente akytojo silicio sluoksnį, galima veikti (valdyti) saulės elementų voltamperines charakteristikas ir elemento nuosekliąją elektrinę varžą. Nustatyta, kad tiriamajame bandinyje suformavus akytojo silicio sluoksnį, apkrovos voltamperinės charakteristikos užpildos rodiklis padidėjo 1,15 karto, o maksimali elemento kuriama ir apkrovos metu atiduodama elektros energijos galia – 1,19 karto. Tiek pat 1,19 karto padidėjo saulės elemento šviesos konversijos į elektros energiją efektyvumas.

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An Integrated Numerical Model for a PEM Fuel Cell System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.706-708.1742 ◽

2013 ◽

Vol 706-708 ◽

pp. 1742-1745 ◽

Cited By ~ 1

Author(s):

Zhou Bo Ding ◽

Li Ping He ◽

Z. Dong ◽

X. Gao

Keyword(s):

Fuel Cell ◽

Numerical Model ◽

Output Power ◽

Pem Fuel Cell ◽

Cell System ◽

Fuel Cell System ◽

Fuel Cell Stack ◽

Operation Conditions ◽

Maximal Output Power ◽

Maximal Output

PEM Fuel Cell (PEMFC) system plays an important role in a future hydrogen economy. Numerical modeling is useful to evaluate and optimize PEM fuel cell system. Therefore, this paper developed an integrated numerical model for predicting the power output of PEMFC system and optimizing system operation parameters to achieve the maximal output power. The developed numerical model integrated the models of fuel cell stack itself and its auxiliary systems, which were quantitatively described and analyzed with calculation equations. Furthermore, the newly developed numerical model was applied to a PEMFC powered scooter to estimate the output power a PEMFC system and optimize the operation conditions parameters of its auxiliary systems based on optimization algorithm. This validates that the developed integrated numerical model is useful and reliable for predicting the net output power and achieving maximal net output power through optimizing the operating parameters of a PEMFC system.

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Numerical investigation of an impact of a top gold metallization on output power of a p-up III-N-based blue-violet edge-emitting laser diode

Opto-Electronics Review ◽

10.1515/oere-2015-0019 ◽

2015 ◽

Vol 23 (2) ◽

Cited By ~ 4

Author(s):

M. Kuc ◽

R.P. Sarzała ◽

S. Stańczyk ◽

P. Perlin

Keyword(s):

Output Power ◽

Laser Diode ◽

Thermal Performance ◽

Optical Model ◽

Ridge Waveguide ◽

Waveguide Laser ◽

Maximal Output Power ◽

Maximal Output ◽

Ridge Waveguide Laser ◽

Gold Metallization

AbstractThe effect of modifications in epi-side (top) gold metallization on a thermal performance and on power roll-over of blue-vio- let III-N-based p-up edge-emitting ridge-waveguide laser diode (RW EEL) was explored in this paper. The calculations were carried out using a two-dimensional self-consistent electrical-thermal model combined with a simplified optical model tuned to a RW EEL fabricated in the Institute of High Pressure Physics (Unipress). Our results suggest that with proper modifica- tions in the III-N-based RW EEL, excluding modifications in its inner structure, it is possible to considerably improve the thermal performance and, thus, increase the maximal output power.

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Investigation of Flyback Transformer Flux Leakage Reduction Ways

Mokslas - Lietuvos ateitis ◽

10.3846/mla.2017.1037 ◽

2017 ◽

Vol 9 (3) ◽

pp. 312-317

Author(s):

Edvardas Bielskis ◽

Martynas Šapurov ◽

Andrius Platakis

Keyword(s):

Experimental Investigation ◽

Optimal Design ◽

Design Optimization ◽

Output Power ◽

Leakage Flux ◽

Maximal Output Power ◽

Maximal Output ◽

Transformer Design ◽

The Impact ◽

Flux Leakage

Results of experimental investigation and design optimization of flyback transformer are presented. Aim of the work is to investigate experimentally the impact of the flyback transformer design on the flux leakage and maximal output power. It is difficult to evaluate the effect of the leakage flux mathematically because it depends on various factors: the position of the windings relative to each other; the position of the windings in the transformer; the distance between the winding. A multi-winding flyback transformer was used for experiments. Using the results of the experiments optimal design of the investigated flyback transformer was defined.

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