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Fabrication and characterization of high-damage resistance Zn-diffused MgO:PPLN ridge waveguides

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Optoelectronics Letters 2024年第1期20卷 12-17页

作者： CHENG Xing feng xinkai MA Lei CHEN Jiaying CHEN Huaixi LIANG Wanguo College of Chemistry Fuzhou UniversityFuzhou 350108China Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

This study investigates the fabrication process of Zn-diffused ridge waveguides in periodically poled magnesium-doped lithium niobate(PPMgO:LN).A controlled variable method is used to study the effects of diffusion temperature,diffusion time,ZnO film thickness,and barrier layer thickness on the surface domain depolarization and waveguide quality of PPMgO:LN.A special barrier layer is proposed that can automatically lift off from the sample surface,which increases the depth of Zn doping and reduces the surface loss of the *** optimizing the process parameters,we fabricate Zn-diffused PPMgO:LN ridge waveguides with a length of 22.80 mm and a period of 18.0μ*** above waveguides can make a second harmonic generation(SHG)at 775 nm with an output power of 90.20 mW by a pump power of 741 mW at 1550 *** corresponding conversion efficiency is 3.160%/W·cm2,and the waveguide loss is approximately 0.81 dB/*** results demonstrate that high-efficiency devices can be obtained through the fabrication process described in this paper.

关键词： waveguide waveguides pump

High-intensity spatial-mode steerable frequency up-converter toward on-chip integration

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Opto-Electronic Science 2024年第4期3卷 12-20页

作者： Haizhou Huang Huaixi Chen Huagang Liu Zhi Zhang xinkai feng Jiaying Chen Hongchun Wu Jing Deng Wanguo Liang Wenxiong Lin Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of ScienceFuzhou 350002China Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education Fujian Provincial Key Laboratory of Photonics TechnologyCollege of Photonic and Electronic EngineeringFujian Normal UniversityFuzhou 350117China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China College of Digital Economy Fujian Agriculture and Forestry UniversityFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China.

Integrated photonic devices are essential for on-chip optical communication,optical-electronic systems,and quantum information *** develop a high-fidelity interface between photonics in various frequency domains without disturbing their quantum properties,nonlinear frequency conversion,typically steered with the quadratic(χ2)process,should be ***,another degree of freedom in steering the spatial modes during theχ2 process,with unprecedent mode intensity is proposed here by modulating the lithium niobate(LN)waveguide-based inter-mode quasi-phasematching conditions with both temperature and wavelength *** high incident light intensities(25 and 27.8 dBm for the pump and the signal lights,respectively),mode conversion at the sum-frequency wavelength with sufficient high output power(−7–8 dBm)among the TM01,TM10,and TM00 modes is realized automatically with characterized broad temperature(ΔT≥8°C)and wavelength windows(Δλ≥1 nm),avoiding the previous efforts in carefully preparing the signal or pump *** results prove that high-intensity spatial modes can be prepared at arbitrary transparent wavelength of theχ2 media toward on-chip integration,which facilitates the development of chip-based communication and quantum information systems because spatial correlations can be applied to generate hyperentangled states and provide additional robustness in quantum error correction with the extended Hilbert space.

关键词： integrated photonics LN waveguide sum-frequency generation spatial-mode steering on-chip integration

基于紧凑型Nd∶YAG/PPMgLN模组的561 nm基模激光器

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人工晶体学报 2024年第9期53卷 1512-1518页

作者：伍秋林冯新凯陈怀熹陈家颖马翠坪梁万国中国科学院福建物质结构研究所福州350002 中国福建光电信息科学与技术创新实验室(闽都创新实验室) 福州350108 中国科学院大学北京100049 福建农林大学数字经济学院福州350028 福建师范大学光电与信息工程学院福州350117 福建师范大学物理与能源学院福州350117

本文提出了一种非线性晶体的切角方法,通过切去谐振腔中掺氧化镁周期极化铌酸锂(PPMgLN)晶体输出端面的一角,改变输出端面的激光模式分布,从而实现了稳定的561 nm黄光激光的基模输出。利用有限差分本征模法,仿真出各种切角方案输出端面... 详细信息

本文提出了一种非线性晶体的切角方法,通过切去谐振腔中掺氧化镁周期极化铌酸锂(PPMgLN)晶体输出端面的一角,改变输出端面的激光模式分布,从而实现了稳定的561 nm黄光激光的基模输出。利用有限差分本征模法,仿真出各种切角方案输出端面的激光模式分布,讨论其输出基模的原理,并通过实验测出各方案输出功率随泵浦功率的变化曲线。结果表明,当抽运功率为4.8 W时,实现了最高121 mW的基模输出,光-光转换效率为2.6%,中心波长为560.95 nm,半峰全宽为0.92 nm,3 h内波动性小于1.91%。与已报道的实验结果对比,该实验结果具有更小的结构尺寸,为紧凑型基模激光器提供重要参考。

关键词： PPMgLN晶体 561 nm激光器倍频晶体切角基模输出

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Compact yellow-orange Nd:YVO_(4)/PPMgLN laser at 589 nm

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Optoelectronics Letters 2023年第11期19卷 641-645页

作者： MA Lei feng xinkai CHEN Huaixi CHENG Xing CHEN Jiaying LIANG Wanguo College of Chemistry and Material Fujian Normal UniversityFuzhou 350008China Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

We propose and make a compact yellow-orange laser of the Nd-doped yttrium vanadate(Nd:YVO_(4))/periodically poled Mg-doped lithium niobate(PPMgLN)module by Raman frequency-doubling at 589 *** reasonably designing the size of the Nd:YVO_(4)and 5 mol%PPMgLN crystals,cavity length and coating parameter,a compact 589 nm laser module with a total size of 3 mm×10 mm×1.5 mm is *** the laser module,the input surface of Nd:YVO_(4)crystal is end-pumped by an 808 nm laser diode(LD).Under the effect of linear resonant cavity structure,the output surface of PPMgLN crystal with a period of 9.48μm generates 589 nm yellow-orange *** experimental results show that the maximum output power at 589 nm is 390 mW at the pump power of 3 W with the optical-optical conversion efficiency of 13%and the stability of the output power is less than 2%within 3 h.

关键词： Nd: PPMgLN laser

光纤端面耦合周期极化铌酸锂(PPLN)薄膜波导器件的研究

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人工晶体学报 2024年第8期53卷 1319-1325页

作者：马翠坪陈家颖陈怀熹梁万国伍秋林冯新凯福建师范大学物理与能源学院福州350117 中国科学院福建物质结构研究所福州350002 中国福建光电信息科学与技术创新实验室福州350108 中国科学院大学北京100049 福建师范大学光电与信息工程学院福州350117 福建农林大学安溪茶学院泉州362406

通过有限元模拟器从理论上分析了在理想光学系统中实现光纤与周期性极化铌酸锂(PPLN)波导之间高效耦合的可行性。仿真模拟了单模保偏光纤和透镜光纤在空间中的发散情况。针对截面尺寸为10μm×10μm、长度为20 mm的PPLN脊形波导,进行了... 详细信息

通过有限元模拟器从理论上分析了在理想光学系统中实现光纤与周期性极化铌酸锂(PPLN)波导之间高效耦合的可行性。仿真模拟了单模保偏光纤和透镜光纤在空间中的发散情况。针对截面尺寸为10μm×10μm、长度为20 mm的PPLN脊形波导,进行了与两种不同光纤的直接端面耦合模拟分析。分析发现,尽管透镜光纤的耦合效率高达95%,但其基模占比却不足5%。鉴于PPLN倍频器件主要依赖于激光的基模进行工作,这使透镜光纤的耦合效率在实际应用中显得相对较低。相比之下,单模保偏光纤的基模占比高达93.8%,显示出更为优越的性能。因此,本文选择了单模保偏光纤与PPLN脊形波导进行封装测试。实验结果表明:当温度为24.8℃,从光纤放大器输出的泵浦功率最大为1.6 W时,计算扣除输入端光纤与波导的耦合损耗后的输入泵浦功率为1.2 W,光纤到波导的耦合效率为75%,略高于当前已知的最高效率72%。1 560 nm基频光的输入功率为1.2 W时,最大输出653 mW的倍频光,光光转换效率达到了54.4%,归一化转换效率为20.2%/(W·cm^(2))。

关键词：光纤周期性极化铌酸锂波导端面耦合耦合效率

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重载下可倾瓦推力轴承的热弹流润滑特性分析

航空动力学报 2021年第9期36卷 1861-1870页

作者：冯欣凯杨利花西安交通大学机械结构强度与振动国家重点实验室西安710049 西安交通大学陕西省先进飞行器服役环境与控制重点实验室西安710049 西安交通大学航天航空学院西安710049

建立了可倾瓦推力轴承的热弹流润滑(TEHD)模型,应用Newton-Raphson迭代法求解,研究了弹性变形、热变形和载荷对油膜静动态特性的影响。结果表明:弹性变形会减弱油膜动压效应,而热变形会增强油膜动压效应;随外载荷增大热变形对轴承静动... 详细信息

建立了可倾瓦推力轴承的热弹流润滑(TEHD)模型,应用Newton-Raphson迭代法求解,研究了弹性变形、热变形和载荷对油膜静动态特性的影响。结果表明:弹性变形会减弱油膜动压效应,而热变形会增强油膜动压效应;随外载荷增大热变形对轴承静动态特性的影响逐渐减弱而弹性变形的影响更加显著,重载条件下弹性变形的影响更为敏感。考虑轴承材料抗压性能和抗高温性能对可倾瓦推力轴承静动态特性的影响,对优化推力轴承设计、保证其稳定性和安全性具有重要意义。

关键词：油膜特性可倾瓦推力轴承热弹流润滑弹性变形热变形

Comprehensive integration of single-cell transcriptomic data illuminates the regulatory network architecture of plant cell fate specification

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Plant Diversity 2024年第3期46卷 372-385页

作者： Shanni Cao Xue Zhao Zhuojin Li Ranran Yu Yuqi Li xinkai Zhou Wenhao Yan Dijun Chen Chao He State Key Laboratory of Pharmaceutical Biotechnology School of Life SciencesNanjing UniversityNanjing 210023China National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China

Plant morphogenesis relies on precise gene expression programs at the proper time and position which is orchestrated by transcription factors(TFs)in intricate regulatory networks in a cell-type specific *** we introduced a comprehensive single-cell transcriptomic atlas of Arabidopsis *** atlas is the result of meticulous integration of 63 previously published scRNA-seq datasets,addressing batch effects and conserving biological *** integration spans a broad spectrum of tissues,including both below-and above-ground *** a rigorous approach for cell type annotation,we identified 47 distinct cell types or states,largely expanding our current view of plant cell *** systematically constructed cell-type specific gene regulatory networks and uncovered key regulators that act in a coordinated manner to control cell-type specific gene *** together,our study not only offers extensive plant cell atlas exploration that serves as a valuable resource,but also provides molecular insights into gene-regulatory programs that varies from different cell types.

关键词： Arabidopsis Single cell transcriptome Gene regulatory network Data integration Plant cell atlas

Single-cell transcriptome analysis dissects lncRNA-associated gene networks in Arabidopsis

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Plant Communications 2024年第2期5卷 94-105页

作者： Zhaohui He Yangming Lan xinkai Zhou Bianjiong Yu Tao Zhu Fa Yang Liang-Yu Fu Haoyu Chao Jiahao Wang Rong-Xu feng Shimin Zuo Wenzhi Lan Chunli Chen Ming Chen Xue Zhao Keming Hu Dijun Chen State Key Laboratory of Pharmaceutical Biotechnology School of Life SciencesNanjing UniversityNanjing 210023China Department of Bioinformatics College of Life SciencesZhejiang UniversityHangzhou 310058China Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Key Laboratory of Plant Functional Genomics of the Ministry of Education College of AgricultureYangzhou UniversityYangzhou 225009China Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province/Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou UniversityYangzhou 225009China Zhejiang Zhoushan High School Zhoushan 316099China National Key Laboratory for Germplasm Innovation and Utilization for Fruit and Vegetable Horticultural Crops Hubei Hongshan LaboratoryWuhan 430070China

The plant genome produces an extremely large collection of long noncoding RNAs(lncRNAs)that are generally expressed in a context-specific manner and have pivotal roles in regulation of diverse biological ***,we mapped the transcriptional heterogeneity of lncRNAs and their associated gene reg-ulatory networks at single-cell *** generated a comprehensive cell atlas at the whole-organism level by integrative analysis of 28 published single-cell RNA sequencing(scRNA-seq)datasets from juvenile Arabidopsis *** then provided an in-depth analysis of cell-type-related lncRNA signatures that show expression patterns consistent with canonical protein-coding gene *** further demon-strated that the cell-type-specific expression of lncRNAs largely explains their tissue *** addi-tion,we predicted gene regulatory networks on the basis of motif enrichment and co-expression analysis of lncRNAs and mRNAs,and we identified putative transcription factors orchestrating cell-type-specific expression of *** analysis results are available at the single-cell-based plant lncRNA atlas data-base(scPLAD;https://***/scPLAD/).Overall,this work demonstrates the power of inte-grative single-cell data analysis applied to plant lncRNA biology and provides fundamental insights into lncRNA expression specificity and associated gene regulation.

关键词： single-cell transcriptomics long noncoding RNAs lncRNAs gene regulatory networks GRNs plants

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光纤耦合周期极化铌酸锂薄膜波导器件的研究

中国激光 2023年第22期50卷 118-123页

作者：冯新凯陈怀熹陈家颖梁万国中国科学院福建物质结构研究所福建福州350002 中国科学院大学北京100049

对硅基周期极化铌酸锂(PPLN)薄膜脊形波导进行了理论分析,并使用有限元软件模拟了25℃下泵浦波长为1560 nm的PPLN脊形波导的准相位匹配(QPM)周期与波导脊高和脊宽的关系。仿真结果表明,在相同脊宽(10μm)或脊高(10μm)下,PPLN脊形波导的... 详细信息

对硅基周期极化铌酸锂(PPLN)薄膜脊形波导进行了理论分析,并使用有限元软件模拟了25℃下泵浦波长为1560 nm的PPLN脊形波导的准相位匹配(QPM)周期与波导脊高和脊宽的关系。仿真结果表明,在相同脊宽(10μm)或脊高(10μm)下,PPLN脊形波导的QPM周期随着脊高或脊宽的增加而增大,最后趋于常数(即块状PPLN的QPM周期)。进一步模拟了在脊高和脊宽维持不变的情况下,PPLN脊形波导的QPM周期与温度之间的关系。结果表明,随着温度的增加,PPLN脊形波导的QPM周期逐渐减小,并且温度每升高1℃,QPM周期减小约3 nm。根据仿真结果制作了硅基片上集成PPLN脊形波导器件,将其封装成小体积的光纤入光纤出的波导,并测试了性能。当温度为24.8℃、1560 nm基频光输入功率为1.2 W时,最大输出653 m W的倍频光,光光转换效率达54.4%,归一化转换效率为20.2%·W^(-1)·cm^(-2)。

关键词：非线性光学周期极化铌酸锂薄膜准相位匹配脊形波导