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Effect of copper impurity on the optical loss and Nd^(3+) nonradiative energy loss of Nd-doped phosphate laser glass

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Journal of Rare Earths 2011年第6期29卷 614-617页

作者：徐永春李顺光胡丽丽陈伟 Shanghai Institute of Optics & Fine Mechanics Chinese Academy of Sciences

N31-type phosphate laser glasses doped with different concentrations of Cu were prepared. Their optical loss coefficient at 1053 nm wavelength and nonradiative transition rate from the Nd3＋ 4F3/2 state were determined and analyzed in detail. The optical loss coefficient per unit of Cu2＋（cm–1/ppmw） and the fluorescence decay rate （Hz/ppmw） caused by Cu2＋ and Nd3＋ interaction were 0.0024 and 7.9, respectively. Cu impurity affected both optical loss at 1053 nm and fluorescent emission of Nd3＋ 4F3/2 state seriously in N31 laser glass.

关键词： Nd-doped phosphate laser glass optical loss nonradiative energy loss Cu impurity rare earths

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Characterization of a Raman-based distributed fiber optical temperature sensor in liquid nitrogen

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Superconductivity 2022年第4期4卷 22-28页

作者： Yi Yue Guilun Chen Jiajie Long Li Ren Kao Zhou Xianhao Li Ying Xu Yuejin Tang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina

Distributed Temperature Sensor(DTS)based on Raman scattering have a promising application in temperature monitoring and quench detection of high‐temperature superconducting(HTS)fiber optic *** this paper,a series of mechanical property tests were carried out on fiber optical cables with different encapsulation materials to select the best material for the engineering *** was followed by loss testing of fiber optic cables with different outer diameters under liquid nitrogen(LN_(2))and the optimal outer diameter to meet measurement accuracy and engineering practicability was ***,the temperature measurement of fiber optic cables laid on HTS fiber optic cables were calibrated using thermocouple as a *** results of this research results provide a suitable fiber optic cable for engineering *** the same time,it provides a reference for the selection of optical cable structure parameters in HTS optical cable projects.

关键词： DTS HTS cable Mechanical property optical loss

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Design and growth of GaN-based blue and green laser diodes

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Science China Materials 2020年第8期63卷 1348-1363页

作者： Aiqin Tian Lei Hu Liqun Zhang Jianping Liu Hui Yang Key Lab of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

GaN-based laser diodes(LDs)extend the wavelength of semiconductor LDs into the visible and ultraviolet spectrum ranges,and are therefore expected to be widely used in quantum technology,bio&medical instruments,laser displays,lighting and materials *** development of blue and green LDs is still challenging,even though they are based on the sameⅢ-nitride materials as GaN-based lightemitting *** challenges and progress of GaN-based blue and green LDs are reviewed from the aspects of epitaxial growth and layer structure *** to large differences in lattice constants and growth conditions for InN,GaN,and AlN,considerable effort is required to improve the quality of InGaN multiple quantum well(MQW)gain medium for blue and especially green LDs.p-type doping profiles,conditions and layer structures are critical to reduce the internal losses and to mitigate the degradation of InGaN *** injection is also a key issue for GaN-based LDs.

关键词： GaN-based LDs InG aN therm al degradation In segregation optical loss carrier injection

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