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A High Power Conversion Efficiency L-Band Erbium Doped Fiber Amplifier
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作者 Z.G. Lu C.P. Grover 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期383-384,共2页
By using two sections of erbium doped fiber and a fiber optical reflector, a novel, highly efficient L-band amplifier is demonstrated with significantly power-conversion-efficiency enhancement and the gain increasing ... By using two sections of erbium doped fiber and a fiber optical reflector, a novel, highly efficient L-band amplifier is demonstrated with significantly power-conversion-efficiency enhancement and the gain increasing of as much as 13 dB. 展开更多
关键词 EDFA as of LENGTH high with A high power conversion efficiency L-Band Erbium Doped Fiber Amplifier ASE been for
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Highly Efficient Power Conversion from Salinity Gradients with Ion-Selective Polymeric Nanopores
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作者 凌云 闫东晓 +4 位作者 王鹏飞 汪茂 文琪 刘峰 王宇钢 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第9期91-94,共4页
A polymeric nanopore membrane with selective ionic transport has been proposed as a potential device to convert the chemical potential energy in salinity gradients to electrical power. However, its energy conversion e... A polymeric nanopore membrane with selective ionic transport has been proposed as a potential device to convert the chemical potential energy in salinity gradients to electrical power. However, its energy conversion efficiency and power density are often limited due to the challenge in reliably controlling the size of the nanopores with the conventional chemical etching method. Here we report that without chemical etching, polyimide (PI) membranes irradiated with GeV heavy ions have negatively charged nanopores, showing nearly perfect selectivity for cations over anions, and they can generate electrical power from salinity gradients. We further demonstrate that the power generation efficiency of the PI membrane approaches the theoretical limit, and the maximum power density reaches 130m W/m2 with a modified etching method, outperforming the previous energy conversion device that was made of polymeric nanopore membranes. 展开更多
关键词 of on in from with highly Efficient power conversion from Salinity Gradients with Ion-Selective Polymeric Nanopores
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An asymmetric broad waveguide structure for a 0.98-μm high-conversion-efficiency diode laser 被引量:2
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作者 崇锋 王俊 +5 位作者 熊聪 王翠鸾 韩淋 吴芃 王冠 马骁宇 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2009年第6期64-67,共4页
A novel asymmetric broad waveguide diode laser structure was designed for high power conversion efficiency(PCE).The internal quantum efficiency,the series resistance,and the thermal resistance were theoretically opt... A novel asymmetric broad waveguide diode laser structure was designed for high power conversion efficiency(PCE).The internal quantum efficiency,the series resistance,and the thermal resistance were theoretically optimized.The series resistance and the thermal resistance were greatly decreased by optimizing the thickness of the P-waveguide and the P-cladding layers.The internal quantum efficiency was increased by introducing a novel strain-compensated GaAs0.9P0.1/InGaAs quantum well.Experimentally,a single 1-cm bar with 20% fill factor and 900 μm cavity length was mounted P-side down on a microchannel-cooled heatsink,and a peak PCE of 60% is obtained at 26.3-W continuous wave output power.The results prove that this novel asymmetric waveguide structure design is an efficient approach to improve the PCE. 展开更多
关键词 asymmetric broad waveguide high power conversion efficiency strain-compensated quantum well
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