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Fabrication,microstructures,and optical properties of Yb:Lu_(2)O_(3) laser ceramics from co-precipitated nano-powders

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Journal of Advanced Ceramics 2020年第6期9卷 674-682页

作者： Ziyu LIU guido toci Angela PIRRI Barbara PATRIZI Yagang FENG Jiabei WEI Feng WU Zhaoxiang YANG Matteo VANNINI Jiang LI Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Istituto Nazionale di Ottica Consiglio Nazionale delle RicercheCNR-INOSesto Fiorentino(Fi)50019Italy Istituto di Fisica Applicata“N.Carrara” Consiglio Nazionale delle RicercheCNR-IFACSesto Fiorentino(Fi)50019Italy School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China

The Yb:Lu_(2)O_(3)precursor made up of spherical particles was synthesized through the co-precipitation method in the water/ethanol *** 5 at% Yb:Lu_(2)O_(3)powder is in the cubic phase after calcination at 1100℃ for 4 *** powder also consists of spherical nanoparticles with the average particle and grain sizes of 96 and 49 nm,*** average grain size of the pre-sintered ceramic sample is 526 nm and that of the sample by hot isostatic pressing grows to 612 *** 1.0 mm-thick sample has an in-line transmittance of 81.6%(theoretical value of 82.2%)at 1100 *** largest absorption cross-section at 976 nm is 0.96×1^(0-20)cm^(2) with the emission cross-section at 1033 nm of 0.92×10^(-20)cm^(2) and the gain cross sections are calculated with the smallest population inversion parameter β of *** highest slope efficiency of 68.7% with the optical efficiency of 65.1% is obtained at 1033.3 nm in quasi-continuous wave(QCW)*** the case of continuous wave(CW)pumping,the highest slope efficiency is 61.0% with the optical efficiency of 54.1%.The obtained laser performance indicates that Yb:Lu_(2)O_(3)ceramics have excellent resistance to thermal load stresses,which shows great potential in high-power solid-state laser applications.

关键词： Yb:Lu_(2)O_(3)transparent ceramics co-precipitated nano-powder spectroscopic properties laser performance hot isostatic pressing

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共沉淀纳米粉体制备Yb:CaF2激光陶瓷及其性能研究（英文）

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无机材料学报 2019年第12期34卷 1341-1348页

作者：韦家蓓 toci guido PIRRI Angela PATRIZI Barbara 冯亚刚 VANNINI Matteo 李江中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室上海200050 中国科学院大学材料科学与光电工程中心北京100049 意大利国家研究委员会国立光学研究所佛罗伦萨50019 意大利国家研究委员会“Carrara”应用物理研究所佛罗伦萨50019 意大利国家研究委员会国立光学研究所比萨56124

利用共沉淀法合成的粉体,通过真空烧结结合热压烧结后处理制备了掺镱的氟化钙透明陶瓷(Yb:CaF2)。在600℃预烧1 h,700℃热压烧结2 h制备的5at%Yb:CaF2透明陶瓷在1200 nm处的直线透射率达到92.0%。对陶瓷的显微结构、光谱特性和激光性能... 详细信息

利用共沉淀法合成的粉体,通过真空烧结结合热压烧结后处理制备了掺镱的氟化钙透明陶瓷(Yb:CaF2)。在600℃预烧1 h,700℃热压烧结2 h制备的5at%Yb:CaF2透明陶瓷在1200 nm处的直线透射率达到92.0%。对陶瓷的显微结构、光谱特性和激光性能进行了测试和讨论。研究结果表明,陶瓷样品的显微结构均匀,平均晶粒尺寸为360 nm。此外,计算得到Yb:CaF2陶瓷在977nm处的吸收截面和1030nm处的发射截面分别为0.39×10–20和0.26×10–20cm2。最后,对Yb:CaF2陶瓷激光性能进行了表征,得到最大输出功率为0.9 W,最大斜率效率为23.6%。

关键词： Yb:CaF2 共沉淀法两步烧结激光陶瓷光学性能

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固体激光用Nd:Lu_(2)O_(3)透明陶瓷的制备和光学性能研究

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无机材料学报 2021年第2期36卷 210-216页

作者：刘子玉 toci guido PIRRI Angela PATRIZI Barbara 冯亚刚陈肖朴胡殿君田丰吴乐翔 VANNINI Matteo 李江中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室上海201899 中国科学院大学材料与光电研究中心北京100049 意大利国家研究委员会国立光学研究所佛罗伦萨50019 意大利国家研究委员会“Carrara”应用物理研究所佛罗伦萨50019

Nd:Lu_(2)O_(3)材料由于具有高热导率、低声子能量和优异的光学特性而成为非常有前景的高功率固体激光器用的增益介质。但Lu_(2)O_(3)单晶的熔点超过2400℃,难以生长,而Lu_(2)O_(3)陶瓷既能在低温下制备,又具有与晶体相当的光学性质和... 详细信息

Nd:Lu_(2)O_(3)材料由于具有高热导率、低声子能量和优异的光学特性而成为非常有前景的高功率固体激光器用的增益介质。但Lu_(2)O_(3)单晶的熔点超过2400℃,难以生长,而Lu_(2)O_(3)陶瓷既能在低温下制备,又具有与晶体相当的光学性质和激光性能从而备受关注。本研究制备了高透明的Nd:Lu_(2)O_(3)陶瓷并对其光学性质和激光性能进行探究。以共沉淀法制备的纳米粉体为原料,采用真空烧结结合热等静压(HIP)两步烧结法制备了1.0at%Nd:Lu_(2)O_(3)透明陶瓷。对制备的粉体、素坯和陶瓷的微结构进行了表征:HIP后处理的陶瓷平均晶粒尺寸是724.2nm。厚度为1.0mm的1.0at%Nd:Lu_(2)O_(3)透明陶瓷在1100 nm处的直线透过率是82.4%,样品在806 nm处的吸收截面为1.50×10^(-20)cm^(2),而根据荧光光谱计算得到的发射截面为6.5×10^(–20)cm^(2)。分别在878.8和895.6 nm波长激发下,1.0at%Nd:Lu_(2)O_(3)透明陶瓷(4)^F3/2→(4)^I11/2跃迁的平均荧光寿命均为169ms。当输出耦合镜的透过率TOC=2.0%时,退火后的1.0at%Nd:Lu_(2)O_(3)透明陶瓷获得了最大输出功率为0.47 W的准连续(QCW)激光输出,斜率效率为8.7%。本研究成功制备了显微结构均匀、高透明度的1.0at%Nd:Lu_(2)O_(3)陶瓷,并展示了其在固体激光增益介质领域的广阔应用潜力。

关键词： Nd:Lu2O3透明陶瓷共沉淀法两步烧结光学性能激光性能

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黄光激光用Dy,Tb∶LuAG透明陶瓷的制备与性能研究

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发光学报 2022年第11期43卷 1733-1740页

作者：刘强武龙飞李晓英刘子玉陈鹏辉田丰谢腾飞 PIRRI Angela toci guido 李江江苏大学材料科学与工程学院江苏镇江212013 中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室上海201899 中国科学院大学材料与光电研究中心北京100049 Istituto di Fisica Applicata“N.Carrara” Consiglio Nazionale delle RicercheCNR-IFACVia Madonna del Piano 10C50019 Sesto Fiorentino(Fi)Italy Istituto Nazionale di Ottica Consiglio Nazionale delle RicercheCNR-INOVia Madonna del Piano 10C50019 Sesto Fiorentino(Fi)Italy

以NH_(4)HCO_(3)为沉淀剂,通过共沉淀法合成了分散性良好的Dy,Tb∶LuAG纳米粉体,并研究了前驱体的热分解行为、粉体的物相及显微形貌。在不添加任何烧结助剂的情况下,采用真空预烧结合热等静压烧结技术首次制备出高透明的Dy,Tb∶LuAG陶... 详细信息

以NH_(4)HCO_(3)为沉淀剂,通过共沉淀法合成了分散性良好的Dy,Tb∶LuAG纳米粉体,并研究了前驱体的热分解行为、粉体的物相及显微形貌。在不添加任何烧结助剂的情况下,采用真空预烧结合热等静压烧结技术首次制备出高透明的Dy,Tb∶LuAG陶瓷,并研究了预烧温度对陶瓷显微形貌及光学质量的影响。当预烧温度为1600℃时,退火后的Dy,Tb∶LuAG陶瓷(厚度为1.5 mm)在578 nm处的直线透过率达到83.6%,平均晶粒尺寸为0.9μm。此外,退火后的3%Dy,1%Tb∶LuAG透明陶瓷在447 nm的吸收截面积为1.3×10^(-21) cm^(2),半高宽为3.0 nm,与商用GaN蓝色激光二极管具有良好的匹配性。研究表明,Dy,Tb∶LuAG透明陶瓷在黄光激光领域具有潜在的应用价值。

关键词： Dy,Tb∶LuAG 透明陶瓷共沉淀法热等静压烧结

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Yb∶CaF_(2)透明陶瓷的压力辅助烧结及其性能研究

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人工晶体学报 2024年第11期53卷 1918-1926页

作者：刘强李想郭礼豪 toci guido PIRRI Angela PATRIZI Barbara VANNINI Matteo 吴俊林李江江苏大学材料科学与工程学院镇江212013 中国科学院上海硅酸盐研究所透明陶瓷研究中心上海201899 中国科学院大学材料与光电中心北京100049 意大利国家研究委员会国立光学研究所佛罗伦萨50019 意大利国家研究委员会“Carrara”应用物理研究所佛罗伦萨50019

本文采用化学共沉淀法合成了5%(原子数分数,下同)Yb∶CaF_(2)纳米粉体。经过冷冻干燥后,粉体的团聚程度有所减轻,粉体呈立方片层状,平均颗粒尺寸约为40 nm。以冷冻干燥后的粉体为原料,通过热压烧结结合热等静压(HIP)烧结后处理制备了高... 详细信息

本文采用化学共沉淀法合成了5%(原子数分数,下同)Yb∶CaF_(2)纳米粉体。经过冷冻干燥后,粉体的团聚程度有所减轻,粉体呈立方片层状,平均颗粒尺寸约为40 nm。以冷冻干燥后的粉体为原料,通过热压烧结结合热等静压(HIP)烧结后处理制备了高光学质量的5%Yb∶CaF_(2)透明陶瓷。分析了热压烧结过程中样品的致密化行为,并对陶瓷的显微结构、直线透过率、吸收光谱及激光性能进行测试与表征。结果表明,陶瓷坯体在热压烧结时的保温阶段存在致密化驱动力的激活阈值,同时HIP后处理能够进一步压缩和排除热压陶瓷内残留气孔,有效提高陶瓷的光学质量。通过热压烧结(625℃×2 h,50 MPa)结合HIP后处理(600℃×3 h,100 MPa Ar)制备的5%Yb∶CaF_(2)透明陶瓷在400和1200 nm处的直线透过率分别为72.6%和92.2%(厚度2 mm),其在976 nm处的吸收截面为0.52×10^(-20)cm^(2)。使用波长为930 nm的光纤耦合二极管激光器(LD)端面泵浦Yb∶CaF_(2)透明陶瓷,获得了最大输出功率为0.81 W、斜率效率为9.7%的准连续激光输出。

关键词： Yb∶CaF_(2)透明陶瓷热压烧结热等静压烧结显微结构激光性能

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Deciphering the transcriptomic signature of synaptic activity

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Neural Regeneration Research 2022年第1期17卷 82-84页

作者： guido Hermey Institute for Molecular and Cellular Cognition Center for Molecular Neurobiology HamburgUniversity Medical Center Hamburg-EppendorfHamburgGermany

Neurons undergo activity-dependent changes in their molecular composition and structure in order to regulate cellular processes such as dendritic growth,synapse elimination,spine maturation and synaptic *** synaptic plasticity plays an important role during a critical period in brain development and contributes to sensory adaptation and to learning and memory in the mature nervous *** dysregulation underlies a number of pathological processes in psychiatric and neurodegenerative disorders,such as addiction.

关键词： strength. signature elimination

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Lectures on Wonderful Varieties

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Acta Mathematica Sinica,English Series 2018年第3期34卷 417-438页

作者： guido PEZZINI Dipartimento di Matematica "guido Castelnuovo" "Sapienza" Università di Roma

These notes are an introduction to wonderful varieties. We discuss some general results on their geometry, their role in the theory of spherical varieties, several aspects of the combinatorics arising from these varie... 详细信息

关键词： Wonderful varieties spherical varieties reductive groups

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Converging links between adult-onset neurodegenerative Alzheimer’s disease and early life neurodegenerative neuronal ceroid lipofuscinosis?

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Neural Regeneration Research 2023年第7期18卷 1463-1471页

作者： Marcel Klein guido Hermey Institute for Molecular and Cellular Cognition Center for Molecular Neurobiology HamburgUniversity Medical Center Hamburg-EppendorfHamburgGermany

Evidence from genetics and from analyzing cellular and animal models have converged to suggest links between neurodegenerative disorders of early and late ***,we summarize emerging links between the most common late life neurodegenerative disease,Alzheimer’s disease,and the most common early life neurodegenerative diseases,neuronal ceroid *** studies reported an overlap of clinically diagnosed Alzheimer’s disease and mutations in genes known to cause neuronal ceroid *** data strongly suggest dysfunction of intracellular trafficking mechanisms and the autophagy-endolysosome system in both types of neurodegenerative *** suggests shared cytopathological processes underlying these different types of neurodegenerative diseases.A better understanding of the common mechanisms underlying the different diseases is important as this might lead to the identification of novel targets for therapeutic concepts,the transfer of therapeutic strategies from one disease to the other and therapeutic approaches tailored to patients with specific ***,we review dysfunctions of the endolysosomal autophagy pathway in Alzheimer’s disease and neuronal ceroid lipofuscinoses and summarize emerging etiologic and genetic overlaps.

关键词： Alzheimer’s disease autophagy Batten disease CLN3 disease dementia endosome lysosome neurodegeneration neuronal ceroid lipofuscinosis presenilin

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1991-2020 climate normal in the European Alps:focus on high-elevation environments

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Journal of Mountain Science 2023年第8期20卷 2149-2163页

作者： NIGRELLI guido CHIARLE Marta Istituto di Ricerca per la Protezione Idrogeologica Consiglio Nazionale delle RicercheTorino 10135Italy

Alps are an important geographical area of the European continent and,in this area,temperature increase is most ***,the 1991-2020 climate normal in the Alps has still not been thoroughly *** to fill this gap with a focus on high-elevation environments,minimum and maximum daily air temperature acquired by 23 automatic weather station were *** results show that the mean annual values of minimum and maximum temperature for the 1991-2020 climate normal in the Alps are-2.4℃ and 4.4℃,respectively,with a warming rate of 0.5℃/10 *** mean annual temperature comparison between 1961-1990 and 1971-2000,1961-1990 and 1981-2010,1961-1990 and 1991-2020 climate normal show an increase of 0.3℃,0.5℃ and 0.9℃,*** results also confirm that seasonal and annual temperatures are rising through the whole Alpine arc,mainly in summer and *** work highlights that annual minimum and maximum temperature do not seem to be affected by a positive elevation-dependent ***,a positive elevation-dependent warming in the maximum values of the annual minimum temperature was *** anthropogenic emissions maintain the trend of the last decades,the expected mean annual temperature of the 2001-2030 climate normal is-0.2℃,with an increase of 0.5℃ if compared to the 1991-2020 climate normal and with an increase of 1.5℃ if compared to the 1961-1990 climate *** study highlights the warming rate that is now present in the European Alps,provides indications on the warming rate that will occur in the coming years and highlights the importance of carrying out investigations that consider not only the last 30-year climate normal,but also the most recent 30-year climate normal by comparing them with each other.

关键词： Air temperature trend Climate normal Climate change High mountain climate Alps

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Evolution of temperature indices in the periglacial environment of the European Alps in the period 1990-2019

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Journal of Mountain Science 2021年第11期18卷 2842-2853页

作者： NIGRELLI guido CHIARLE Marta National Research Council Research Institute for Geo-hydrological ProtectionStrada delle Cacce73–TorinoItaly

Air temperature in the European Alps shows warming over recent decades at an average rate of 0.3℃/10 years,therebyoutpacing the global warming rate of 0.2℃/10 *** periglacial environment of the Alps is particularly important for several aspects(*** production,tourism,natural hazards,indicator of global warming).However,there is a lack of specific and updated studies relating to temperature change in this *** order to fill this gap,the recent temperature trends in the periglacial environment of the Alps were ***/maximum/minimum daily air temperatures recorded by 14 land-based meteorological stations were used,and the temperature indices for the period 1990-2019 were *** periglacial environment of the Alps showed a warming rate of 0.4℃/10 years,0.6℃/10 years and 0.8℃/10 years for the mean/maximum/minimum temperatures,*** warming rates are higher than that observed for the entire Alpine *** 2050 many glaciers of the Alps below 3000 m altitude are expected to be extinct,and all the areas previously occupied by glaciers will become *** order to manage and adapt to these changes,more in-depth climate analyses are *** is necessary for all the mountainous areas of the world,which are undergoing similar changes.

关键词： Mountain climate Cryosphere Climate change Extreme temperature Air temperature trend

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