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Analysis of third and one-third harmonic generation in lossy waveguides
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作者 张剑宇 孙云旭 宋清海 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第6期209-212,共4页
A comprehensive study on the requirements for the highly efficient third harmonic generation(THG) and its inverse process, one-third harmonic generation(OTHG), in lossy waveguides is proposed. The field intensity rest... A comprehensive study on the requirements for the highly efficient third harmonic generation(THG) and its inverse process, one-third harmonic generation(OTHG), in lossy waveguides is proposed. The field intensity restrictions for both THG and OTHG caused by loss are demonstrated. The effective relative phase ranges, supporting the positive growth of signal fields of THG and OTHG are shrunken by the loss. Furthermore, it turns out that the effective relative phase ranges depend on the intensities of the interacting fields. At last, a modified definition of coherent length in loss situation, which evaluates the phase matching degree more precisely, is proposed by incorporating the shrunken relative phase range and the nonlinear phase mismatch. These theoretical analysis are valuable for guiding the experimental designs for highly efficient THG and OTHG. 展开更多
关键词 coupled mode theory THIRD HARMONIC GENERATION one-third HARMONIC GENERATION LOSS effects
营卫析解及临床应用研究 预览
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作者 侯仙明 刘淑彦 +3 位作者 潘永梅 方敬 贾云芳 贾春生 《河北中医药学报》 2019年第2期9-13,39共6页
笔者对营卫的生成、分布与循行提出了一些新的认识:⑴明确了营气与卫气的生成源头及组成。即营气之源头在中焦脾胃,其组成包括:水谷之精气和自然之清气;卫气之源头在下焦肾,其组成包括:水谷之精气、自然之清气和肾中之精气。⑵明确提出... 笔者对营卫的生成、分布与循行提出了一些新的认识:⑴明确了营气与卫气的生成源头及组成。即营气之源头在中焦脾胃,其组成包括:水谷之精气和自然之清气;卫气之源头在下焦肾,其组成包括:水谷之精气、自然之清气和肾中之精气。⑵明确提出营气循行有两条路线,分别为经络路线与血脉路线。⑶以取象比类的方法对卫气循行的3种方式进行了分析,提出了卫气有2种运行状态,其一为全身散布,由内而外的运行状态;其二为循经运行,昼行于阳,夜行于阴,一日一夜五十周于身的运行模式。⑷以太极阴阳消长变化模型对卫气“昼行于阳,夜行于阴”进行了重新解读。⑸对于卫气昼行于阳的路线提出主干与分支说,其循行主干是:起于目,沿太阳膀胱经之主干下行至足小趾,然后由小趾入足心,上内踝,走跷脉上行复归于目。主要涉及足太阳膀胱经、足少阴肾经(一部分)与跷脉。其他循行的阳经均是分支。⑹提出卫气的循行方向存在多向性。另外,除了理论上的认识外,本文还对“避”“脉”“随”等相关文字对内经原文中的含义进行了重新解读。 展开更多
关键词 营卫 营气 卫气 生成 分布 循行
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SLIPS-TENG:robust triboelectric nanogenerator with optical and charge transparency using a slippery interface
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作者 Wanghuai Xu Xiaofeng Zhou +8 位作者 Chonglei Hao Huanxi Zheng Yuan Liu Xiantong Yan Zhengbao Yang Michael Leung Xiao Cheng Zeng Ronald X. Xu Zuankai Wang 《国家科学评论:英文版》 CSCD 2019年第3期540-550,共11页
Energy harvesting devices that prosper in harsh environments are highly demanded in a wide range of applications ranging from wearable and biomedical devices to self-powered and intelligent systems.Particularly,over t... Energy harvesting devices that prosper in harsh environments are highly demanded in a wide range of applications ranging from wearable and biomedical devices to self-powered and intelligent systems.Particularly,over the past several years,the innovation of triboelectric nanogenerators(TENGs)that efficiently convert ambient kinetic energy of water droplets or wave power to electricity has received growing attention.One of the main bottlenecks for the practical implications of such devices originates from the fast degradation of the physiochemical properties of interfacial materials under harsh environments.To overcome these challenges,here we report the design of a novel slippery lubricant-impregnated porous surface(SLIPS)based TENG,referred to as SLIPS-TENG,which exhibits many distinctive advantages over conventional design including optical transparency,configurability,self-cleaning,flexibility,and power generation stability,in a wide range of working environments.Unexpectedly,the slippery and configurable lubricant layer not only serves as a unique substrate for liquid/droplet transport and optical transmission,but also for efficient charge transfer.Moreover,we show that there exists a critical thickness in the liquid layer,below which the triboelectric effect is almost identical to that without the presence of such a liquid film.Such an intriguing charge transparency behavior is reminiscent of the wetting transparency and van der Waals potential transparency of graphene previously reported,though the fundamental mechanism remains to be elucidated.We envision that the marriage of these two seemingly totally different arenas(SLIPS and TENG)provides a paradigm shift in the design of robust and versatile energy devices that can be used as a clean and longer-lifetime alternative in various working environments. 展开更多
关键词 slippery surface triboelectricity power generation water DROPLET interfaces
Generate basic conceptual solutions for 3DPVS via utilizing TRIZ 预览
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作者 Haobo Yuan Ke Xing Hung-Yao Hsu 《生物设计与制造(英文)》 CSCD 2019年第2期76-95,共20页
For cell culture scaffold innovation,3DPVS,namely 3D printed vibratory scaffold,was indicated as a future novel product,and it currently stands at conceptual development stage.One essential part for 3DPVS design is in... For cell culture scaffold innovation,3DPVS,namely 3D printed vibratory scaffold,was indicated as a future novel product,and it currently stands at conceptual development stage.One essential part for 3DPVS design is innovation,and TRIZ(algorithm of inventive problem solving)was studied as promising method for generating novel conceptual solutions.This study targets designing and solving 3DPVS problems using TRIZ in the new biodimension.We aim to utilize TRIZ to conduct a multi-layer problem-solving process,which is to address design concerns of 3DPVS,especially at super-system to system level.In this connection,TRIZ is used to address basic constraints and contradictions inside regarding trinity of 3D printing,3D scaffold and bio-based vibratory functionality.In the study,five basic conceptual solutions for potential 3DPVS,namely magnetic,electric,mechanical,light and thermal based,have been generated.A brief evaluation has also been conducted,where magnetic-based 3DPVS shows the relatively highest applicability as potential 3DPVS.Compared with traditional experimental-oriented processes for biodesign,the approach of utilizing TRIZ can be inspiring and reinvigorating,which prepares a ground for future 3DPVS design to address detailed sub-system concerns.This study might,to some extent,fill a gap in scaffold design and TRIZ literature and hopefully provide a comprehensive perspective of a timely topic. 展开更多
关键词 3DPVS 3D SCAFFOLD 3D PRINTING SCAFFOLD INNOVATION Biodesign TRIZ CONCEPT generation
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The revival of thermal utilization from the Sun:interfacial solar vapor generation
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作者 Lin Zhou Xiuqiang Li +2 位作者 George W. Ni Shining Zhu Jia Zhu 《国家科学评论:英文版》 CSCD 2019年第3期562-578,共17页
Since solar energy is the ultimate energy resource and a significant amount of global energy utilization goes through heat,there have been persistent efforts for centuries to develop devices and systems for solar–the... Since solar energy is the ultimate energy resource and a significant amount of global energy utilization goes through heat,there have been persistent efforts for centuries to develop devices and systems for solar–thermal conversion.Most recently,interfacial solar vapor generation,as an emerging concept of solar–thermal conversion,has gained significant attention for its great potentials in various fields such as desalination,sterilization,catalysis,etc.With the advances of rationally designed materials and structures and photon and thermal management at the nanoscale,interfacial solar vapor generation has demonstrated both thermodynamic and kinetical advantages over conventional strategies.In this review,we aim to illustrate the definition,mechanism and figures of merit of interfacial solar vapor generation,and to summarize the development progress of relevant materials and applications,as well as to provide a prospective view of the future. 展开更多
关键词 SOLAR vapor generation SOLAR ABSORBER SOLAR EVAPORATOR INTERFACIAL heating
长白公猪不同代数及血缘对产活仔数和初生重的影响 预览
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作者 潘建文 《福建畜牧兽医》 2019年第4期15-17,共3页
本文通过收集福建某猪场2015-2018年长白猪的生产数据,研究公猪代数、血缘对母猪产活仔数、仔猪初生重的影响。结果表明:长白猪不同代数对产活仔数与初生重有显著差异,产活仔数第3代最多,为12.34头。初生重第2、第3代最高,代数1至代数2... 本文通过收集福建某猪场2015-2018年长白猪的生产数据,研究公猪代数、血缘对母猪产活仔数、仔猪初生重的影响。结果表明:长白猪不同代数对产活仔数与初生重有显著差异,产活仔数第3代最多,为12.34头。初生重第2、第3代最高,代数1至代数2的初生重呈上升趋势,代数3、代数4呈下降趋势,表明选择第3代最好;血缘关系对产活仔数呈现差异性,其中血缘2最多(12.24头),相比其他血缘有很高的优越性。血缘对于初生重也有很大差异影响,血缘23与血缘2、15、17有显著差异性。 展开更多
关键词 代数 血缘 产活仔数 初生重
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Facile oxalic acid-assisted construction of laminated porous N-deficient graphitic carbon nit ride: Highly efficient visible-light-driven hydrogen evolution photocatalyst 预览
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作者 Fengli Yang Jia Ren +3 位作者 Qianqian Liu Lu Zhang Yuanyuan Chai Wei-Lin Dai 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第6期1-8,共8页
The laminated porous N-deficient g-C3N4(CN–H)is successfully synthesized by a facile two-step hydrothermal calcination method using oxalic acid-assisted melamine as the precursor.Compared with pristine g-C3N4(224μmo... The laminated porous N-deficient g-C3N4(CN–H)is successfully synthesized by a facile two-step hydrothermal calcination method using oxalic acid-assisted melamine as the precursor.Compared with pristine g-C3N4(224μmol g-1h-1),the CN–H shows superior photocatalytic hydrogen production activity(up to 728μmol g-1h-1),which is three times higher than the unmodified counterpart.To draw out the multifaceted influences of oxalic acid modification on the visible-light-induced photocatalytic activity,various techniques are utilized to investigate the formation mechanism,structural characteristics and photoelectrical properties of CN–H.The results indicate that the addition of a trace amount of oxalic acid to the precursor melamine results in a g-C3N4 structure possessing the advantage of both nitrogen defects and laminated porosity.These properties can enlarge specific surface areas of g-C3N4,enhance an efficient separating of photogenerated electron-hole pairs and extend the range of spectral response,all contributing to the enhancement of the visible-light-induced photocatalytic activity. 展开更多
关键词 Oxalic acid Melamine LAMINATED POROUS N-deficient g-C3N4 Visible-light-induced photocatalytic activity for H2 generation
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Exergetic sustainability evaluation and optimization of an irreversible Brayton cycle performance
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作者 Mohammad H. AHMADI Mohammad-Ali AHMADI +3 位作者 Esmaeil ABOUKAZEMPOUR Lavinia GROSU Fathollah POURFAYAZ Mokhtar BIDI 《能源前沿:英文版》 CSCD 2019年第2期399-410,共12页
Owing to the energy demands and global warming issue, employing more effective power cycles has become a responsibility. This paper presents a thermo-dynamical study of an irreversible Brayton cycle with the aim of op... Owing to the energy demands and global warming issue, employing more effective power cycles has become a responsibility. This paper presents a thermo-dynamical study of an irreversible Brayton cycle with the aim of optimizing the performance of the Brayton cycle. Moreover, four different schemes in the process of multi-objective optimization were suggested, and the outcomes of each scheme are assessed separately. The power output, the concepts of entropy generation, the energy, the exergy output, and the exergy efficiencies for the irreversible Brayton cycle are considered in the analysis. In the first scheme, in order to maximize the exergy output, the ecological function and the ecological coefficient of performance, a multi-objective optimization algorithm (MOEA) is used. In the second scheme, three objective functions including the exergetic performance criteria, the ecological coefficient of performance, and the ecological function are maximized at the same time by employing MOEA. In the third scenario, in order to maximize the exergy output, the exergetic performance criteria and the ecological coefficient of performance, a MOEA is performed. In the last scheme, three objective functions containing the exergetic performance criteria, the ecologi-cal coefficient of performance, and the exergy-based ecological function are maximized at the same time by employing multi-objective optimization algorithms. All the strategies are implemented via multi-objective evolu-tionary algorithms based on the NSGAII method. Finally, to govern the final outcome in each scheme, three well- known decision makers were employed. 展开更多
关键词 ENTROPY generation EXERGY Brayton CYCLE ECOLOGICAL function IRREVERSIBILITY
新时期“Z世代”大学生思想政治教育的有效途径探析
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作者 王庆男 《创新创业理论研究与实践》 2019年第1期174-175,共2页
”Z世代”作为新兴力量开始成为大学生的主体,他们有着鲜明的特征。作为高校学生思想政治教育的骨干力量,在面对个性越来越鲜明的新时代大学生时,必须要把握”Z世代”大学生的特点,通过不断创新管理方法,选择合理的教育模式,积极转变工... ”Z世代”作为新兴力量开始成为大学生的主体,他们有着鲜明的特征。作为高校学生思想政治教育的骨干力量,在面对个性越来越鲜明的新时代大学生时,必须要把握”Z世代”大学生的特点,通过不断创新管理方法,选择合理的教育模式,积极转变工作思路,做好其思想教育工作。 展开更多
关键词 ”Z世代” 大学生 新时代 辅导员工作
The scientific connotation of oil and gas formations under deep fluids and organic-inorganic interaction
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作者 Quanyou LIU Dongya ZHU +5 位作者 Qingqiang MENG Jiayi LIU Xiaoqi WU Bing ZHOU Qi FU Zhijun JIN 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第3期507-528,共22页
As a relatively stable craton block in the earth system, the petroliferous basin is influenced by the evolution of the earth system from the early development environment of source rocks, hydrocarbon formation, and re... As a relatively stable craton block in the earth system, the petroliferous basin is influenced by the evolution of the earth system from the early development environment of source rocks, hydrocarbon formation, and reservoir dissolution to hydrocarbon accumulation or destruction. As a link between the internal and external factors of the basin, deep fluids run through the whole process of hydrocarbon formation and accumulation through organic-inorganic interaction. The nutrients carried by deep fluids promote the bloom of hydrocarbon-generating organisms and extra addition of carbon and hydrogen source, which are beneficial to the development of high-quality source rock and enhancement of the hydrocarbon generation potential. The energy carried by the deep fluid promotes the early maturation of the source rock and facilitates the hydrocarbon generation by activation and hydrogenation in high-mature hydrocarbon sources. The dissolution alteration of carbonate rocks and clastic reservoirs by CO2-rich deep fluids improves the deep reservoir space, thus extending the oil and gas reservoir space into greater depth. The extraction of deeply retained crude oil by deep supercritical CO2 and the displacement of CH4 in shale have both improved the hydrocarbon fluidity in deep and tight reservoirs. Simultaneously, the energy and material carried by deep fluids(C, H, and catalytic substances) not only induce inorganic CH4 formation by Fischer-Tropsch(F-T) synthesis and "hydrothermal petroleum" generation from organic matter by thermal activity but also cause the hydrothermal alteration of crude oil from organic sources. Therefore, from the perspective of the interaction of the earth’s sphere, deep fluids not only input a significant amount of exogenous C and H into sedimentary basins but also improve the reservoir space for oil and gas, as well as their enrichment and accumulation efficiencies. 展开更多
关键词 ORGANIC-INORGANIC INTERACTION Deep fluid HYDROCARBON generation from HYDROGENATION DISSOLUTION ALTERATION Displacement
Resource types, formation, distribution and prospects of coal-measure gas 预览
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作者 ZOU Caineng YANG Zhi +5 位作者 HUANG Shipeng MA Feng SUN Qinping LI Fuheng PAN Songqi TIAN Wenguang 《石油勘探与开发:英文版》 2019年第3期451-462,共12页
Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and... Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and trap-type coal-bearing gas reservoirs. Huge in resources, it is an important gas source in the natural gas industry. The formation and distribution characteristics of coal-measure gas in San Juan, Surat, West Siberia and Ordos basins are introduced in this paper. By reviewing the progress of exploration and development of coal-measure gas around the world, the coal-measure gas is confirmed as an important strategic option for gas supply. This understanding is mainly manifested in three aspects. First, globally, the Eurasian east-west coal-accumulation belt and North American north-south coal-accumulation belt are two major coal-accumulation areas in the world, and the Late Carboniferous–Permian, Jurassic and end of Late Cretaceous–Neogene are 3 main coal-accumulation periods. Second, continuous-type and trap-type are two main accumulation modes of coal-measure gas;it is proposed that the area with gas generation intensity of greater than 10×10^8 m^3/km^2 is essential for the formation of large coal-measure gas field, and the CBM generated by medium- to high-rank coal is usually enriched in syncline, while CBM generated by low-rank coal is likely to accumulate when the source rock and caprock are in good configuration. Third, it is predicted that coal-measure gas around the world has huge remaining resources, coal-measure gas outside source is concentrated in Central Asia-Russia, the United States, Canada and other countries/regions, while CBM inside source is largely concentrated in 12 countries. The production of coal-measure gas in China is expected to exceed 1000×10^8 m^3 by 2030, including (500–550)×10^8 m^3 conventional coal-measure gas,(400–450)×10^8 m^3 coal-measure tight gas, and (150–200)×10^8 m^3 CBM. 展开更多
关键词 coal-measure GAS (CMG) coalbed methane (CBM) tight GAS continuous-type trap-type GAS generation intensity resource potential coal-accumulation period coal-accumulation area
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High power and energy generation in a Nd:YAG single-crystal fiber laser at 1834 nm
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作者 YAQI CAI BIN XU +6 位作者 YUNSHAN ZHANG QINGYU TIAN XIAODONG XU QINGSONG SONG DONGZHEN LI JUN XU IVAN BUCHVAROV 《光子学研究:英文版》 CSCD 2019年第2期162-166,共5页
We report on a diode-end-pumped high-power and high-energy Nd:YAG single-crystal fiber laser at 1834 nm.Two 808 nm diodes injecting about 58 W pump power into the Nd:YAG fiber have generated 3.28 W continuouswave and ... We report on a diode-end-pumped high-power and high-energy Nd:YAG single-crystal fiber laser at 1834 nm.Two 808 nm diodes injecting about 58 W pump power into the Nd:YAG fiber have generated 3.28 W continuouswave and 1.66 W Cr:ZnSe-based passively Q-switched lasers. Slope efficiencies with respect to pump powers are8.7% for the continuous-wave laser and 4.9% for the Q-switched laser. The extracted maximum pulse energy is about 266.9 μJ, and the corresponding maximum pulse peak power is 2.54 kW. These performances greatly surpass previous results regarding this specific laser emission because the laser gain medium in the form of fiber can significantly mitigate thermally induced power saturation thanks to its significantly reduced thermal lensing effect. Single-crystal fiber lasers show great potential for high average power, pulse energy, and peak power. 展开更多
关键词 High power energy GENERATION
The effects of gas flow pattern on the generation of ozone in surface dielectric barrier discharge
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作者 谢松汝 何勇 +4 位作者 袁定琨 王智化 Sunel KUMAR 朱燕群 岑可法 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第5期168-178,共11页
Ozone production utilizing surface dielectric barrier discharge(SDBD)was experimental studied for different flow patterns considering the influences of transversal flow,lateral flow and different lateral flow position... Ozone production utilizing surface dielectric barrier discharge(SDBD)was experimental studied for different flow patterns considering the influences of transversal flow,lateral flow and different lateral flow positions.Results show that the flow patterns have a remarkable impact on the ozone yield by affecting the uniformity and turbulenee of gas flow.Meanwhile,distributing the O2 flow rate according to the intensity of the plasma reaction would also increase the generation efficiency of SDBD for ozone production.By improving the uniformity and introducing the lateral flow to the transversal flow,the highest ozone yield was obtained in flow pattern'F‘.In this case,the ozone yield increased by 28.4%to 131 g kWh^-1 from 102.8 g kWh^-1 in flow pattern‘A’. 展开更多
关键词 surface DIELECTRIC BARRIER DISCHARGE gas flow OZONE generation
Engaging Generation Z:A Case Study on Motivating the Post-Millennial Traditional College Student in the Classroom 预览
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作者 Kimberlee R.Mendoza 《美中外语:英文版》 2019年第4期157-166,共10页
Engagement among the Post-Millennial college student has become problematic due to a culture of technology and instant gratification.Research indicates that student engagement is linked to student learning,and therefo... Engagement among the Post-Millennial college student has become problematic due to a culture of technology and instant gratification.Research indicates that student engagement is linked to student learning,and therefore it is essential that professors find improved techniques to reconnect with today’s student.Based on Generational Theory,which states that cohorts of people within a certain span of time share certain traits,it is determined that Generation Z(those born between 1995 and 2010)is unlike any other generation before them.The purpose of this research study was to learn what would engage and disengage Generation Z students in the classroom.A single case qualitative case study including journals,interviews,field notes,audiotapes,a personal reflection,and classroom observation were applied.The findings from this study show that relationship,passion,active teaching,and applied learning are all ways in which a professor may be able to connect and engage with his or her class. 展开更多
关键词 STUDENT ENGAGEMENT GENERATION Z HIGHER education Post-Millennial active teaching applied learning
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Polymer coated nanowire network promises self-healing and superstretchable conductors
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作者 Markus Antonietti 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第2期151-152,共2页
The generation of stretchable conductors is a mandatory precondition for the next-generation electronic devices ineluding flexible,wearable electronics,smart skins and bioinspired devices [1-4].This new class of elect... The generation of stretchable conductors is a mandatory precondition for the next-generation electronic devices ineluding flexible,wearable electronics,smart skins and bioinspired devices [1-4].This new class of electronic materials takes up external mechanical deformations and maintains structural integrity and electronic performance throughout bending,folding and stretching processes.Although intense efforts have been devoted to the construction of stretchable conductors,large stretchability is still difficult to achieve. 展开更多
关键词 GENERATION POLYMER STRETCHABLE
Nitrite pre-treatment of dewatered sludge for microbial fuel cell application
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作者 Abdul Rasyid Ruslan Vel Murugan Vadivelu 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第3期148-155,共8页
The effect of pre-treatment of dewatered sludge using different nitrite concentrations and p H for microbial fuel cell(MFC) application was investigated. The results show that the addition of nitrite was feasible to i... The effect of pre-treatment of dewatered sludge using different nitrite concentrations and p H for microbial fuel cell(MFC) application was investigated. The results show that the addition of nitrite was feasible to increase the solubilization rate of the sludge and may reduce mass transfer limitation at the anode. This helped the MFC to reach higher voltage and to generate more power. The higher free nitrous acid(FNA) concentration under the acidic condition helped to increase sludge solubilization. However, under an alkaline condition, during which the FNA concentration was relatively low, the solubilization of the sludge was higher. The highest voltage and power density produced was 390 mV and 153 mW/m~2, respectively, with the addition of nitrite at 100 mg-N/L and pH 9. Furthermore,it was found that elevated levels of FNA could inhibit electrogenic bacteria thus reducing power generation. 展开更多
关键词 Dewatered SLUDGE NITRITE pre-treatment Free nitrous acid MICROBIAL FUEL cell ELECTRICITY GENERATION
Nanosecond Pulse Generation with Silver Nanoparticle Saturable Absorber
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作者 R.Z.R.R.Rosdin M.T.Ahmad +3 位作者 A.R.Muhammad Z.Jusoh H.Arof S.W.Harun 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第5期31-34,共4页
Nanosecond pulse generation in an erbium-doped fiber laser (EDFL) passively mode-locked by a silver nanoparticle(SNP)-based saturable absorber(SA) is experimentally demonstrated. The SA is fabricated by depositing a n... Nanosecond pulse generation in an erbium-doped fiber laser (EDFL) passively mode-locked by a silver nanoparticle(SNP)-based saturable absorber(SA) is experimentally demonstrated. The SA is fabricated by depositing a nanosized SNP layer onto the surface of polyvinyl alcohol film through the thermal evaporation process. By inserting the SA into an EDFL cavity, stable mode-locked operation is achieved at 1561.5 nm with the maximum pulse energy up to 52.3 nJ. The laser operates at a pulse repetition frequency of 1.0 MHz with a pulse width of 202 ns. These results suggest that SNPs could be developed as an effective SA for mode-locking pulse generation. 展开更多
关键词 SA Nanosecond PULSE GENERATION with SILVER NANOPARTICLE Saturable ABSORBER
Effect of Carrier Envelope Phase on High-Order Harmonic Generation from Solid
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作者 邵洁 张彩萍 +2 位作者 贾景超 马俊琳 苗向阳 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第5期35-39,共5页
The dependence of harmonic emission from a solid on the carrier envelope phase (CEP) is discussed by numerically solving the time-dependent Schr?dinger equation. The harmonic spectra periodically exhibit three distinc... The dependence of harmonic emission from a solid on the carrier envelope phase (CEP) is discussed by numerically solving the time-dependent Schr?dinger equation. The harmonic spectra periodically exhibit three distinct oscillating structures, which indicate the different dependences of the cutoff energies on the CEP. Furthermore,with time-dependent population imaging and the populations of different energy bands, the underlying physical mechanism is explored. 展开更多
关键词 CEP EFFECT of CARRIER ENVELOPE Phase on HIGH-ORDER HARMONIC Generation from SOLID CB
Visible Kerr comb generation in a high-Q silica microdisk resonator with a large wedge angle
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作者 Jiyang Ma Longfu Xiao +5 位作者 Jiaxin Gu Hao Li Xinyu Cheng Guangqiang He Xiaoshun Jiang Min Xiao 《光子学研究:英文版》 CSCD 2019年第5期573-578,共6页
This paper describes the specially designed geometry of a dry-etched large-wedge-angle silica microdisk resonator that enables anomalous dispersion in the 780 nm wavelength regime. This anomalous dispersion occurs nat... This paper describes the specially designed geometry of a dry-etched large-wedge-angle silica microdisk resonator that enables anomalous dispersion in the 780 nm wavelength regime. This anomalous dispersion occurs naturally without the use of a mode-hybridization technique to control the geometrical dispersion. By fabricating a1-μm-thick silica microdisk with a wedge angle as large as 56° and an optical Q-factor larger than 107, we achieve a visible Kerr comb that covers the wavelength interval of 700–897 nm. The wide optical frequency range and the closeness to the clock transition at 698 nm of 87 Sr atoms make our visible comb a potentially useful tool in optical atomic clock applications. 展开更多
关键词 COMB GENERATION HIGH-Q SILICA MICRODISK RESONATOR large wedge angle
Multi-channel 28-GHz millimeter-wave signal generation on a silicon photonic chip with automated polarization control 预览
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作者 Ruiyuan Cao Yu He +4 位作者 Qingming Zhu Jingchi Li Shaohua An Yong Zhang Yikai Su 《半导体学报:英文版》 EI CAS CSCD 2019年第5期33-39,共7页
We propose and experimentally demonstrate an integrated silicon photonic scheme to generate multi-channel millimeter-wave(MMW) signals for 5 G multi-user applications. The fabricated silicon photonic chip has a footpr... We propose and experimentally demonstrate an integrated silicon photonic scheme to generate multi-channel millimeter-wave(MMW) signals for 5 G multi-user applications. The fabricated silicon photonic chip has a footprint of 1.1 × 2.1 mm^2 and integrates 7 independent channels each having on-chip polarization control and heterodyne mixing functions. 7 channels of4-Gb/s QPSK baseband signals are delivered via a 2-km multi-core fiber(MCF) and coupled into the chip with a local oscillator(LO) light. The polarization state of each signal light is automatically adjusted and aligned with that of the LO light, and then 7 channels of 28-GHz MMW carrying 4-Gb/s QPSK signals are generated by optical heterodyne beating. Automated polarizationcontrol function of each channel is also demonstrated with ~7-ms tuning time and ~27-dB extinction ratio. 展开更多
关键词 MULTI-CHANNEL millimeter-wave(MMW) generation SILICON PHOTONIC integrated circuits SILICON POLARIZATION control(SPC)
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