We propose a method for generating an all-fiber cylindrical vector beam(CVB)using a fiber Bragg grating(FBG)inscribed in a ring core fiber(RCF).The FBGs are inscribed using the femtosecond laser phase mask scanning te...We propose a method for generating an all-fiber cylindrical vector beam(CVB)using a fiber Bragg grating(FBG)inscribed in a ring core fiber(RCF).The FBGs are inscribed using the femtosecond laser phase mask scanning technique,chosen for its large ring core diameter and low photosensitivity of the RCF.Additionally,a lateral offset splicing spot is introduced to couple the fundamental mode to the second-order modes.Switchable LP_(01)and LP_(11)mode lasers can be achieved.Meanwhile,azimuthally and radially polarized CVBs are successfully realized by adjusting the polarization controllers.展开更多
We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF betwe...We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber(MMF)and single-mode fiber(SMF)at the ends of the MMF as lead-in and lead-out.Due to the first segment of the MMF,the transmitted light is coupled into the ring core,silica center,and cladding of the RCF,exciting multiple modes in the RCF.By the modal interferences in the structure,bending sensing can be realized by interrogating the intensity of the interference dip.Experimental results show a high bending sensitivity of-25.63 dB/m^(-1)in the range of 1.0954 m^(-1)to1.4696 m^(-1).In addition,the advantages of the bend sensor,such as small size,low temperature sensitivity,and simple fabrication process,can be used for curvature measurement in building health monitoring.展开更多
The reaction of a ruthenium carbide complex RuCl2（C：）（PCy3）2 with [H（Et2O）x]＋[BF4]- at a molar ratio of 1：2 produced a two-core ruthenium carbene complex, {[RuCl（=CHPCy3）（PCy3）]2（μ-Cl）3}＋·[BF4]-,...The reaction of a ruthenium carbide complex RuCl2（C：）（PCy3）2 with [H（Et2O）x]＋[BF4]- at a molar ratio of 1：2 produced a two-core ruthenium carbene complex, {[RuCl（=CHPCy3）（PCy3）]2（μ-Cl）3}＋·[BF4]-, in the form of a yellow-green crystalline solid in a yield of 94%. This two-core ruthenium complex is a selective catalyst for ring closing metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed for N-substrates when the two-core ruthenium complex was used as the catalyst at an elevated temperature（137 °C）, indicating that the complex is a chemo-selective catalyst for ring closing metathesis reactions.展开更多
通过中国知网(CNKI)与Web of Science(WOS)核心数据库,检索其中2004年~2024年所收录的环锭包芯纱相关中英文文献,采集相关文献数据。利用CiteSpace知识图谱工具,构建环锭包芯纱研究的知识图谱,对环锭包芯纱领域的年度发文量、作者和国...通过中国知网(CNKI)与Web of Science(WOS)核心数据库,检索其中2004年~2024年所收录的环锭包芯纱相关中英文文献,采集相关文献数据。利用CiteSpace知识图谱工具,构建环锭包芯纱研究的知识图谱,对环锭包芯纱领域的年度发文量、作者和国家合作分布、研究热点与发展趋势进行可视化分析。研究发现:国内环锭包芯纱领域年度发文量总体上呈现逐年递减的趋势;国际年度发文量变化幅度较大,整体上是一个增长的态势。展开更多
基金supported by the National Natural Science Foundation of China(No.62075182)the National Key Research and Development Program of China(No.2022YFB3207502)。
文摘We propose a method for generating an all-fiber cylindrical vector beam(CVB)using a fiber Bragg grating(FBG)inscribed in a ring core fiber(RCF).The FBGs are inscribed using the femtosecond laser phase mask scanning technique,chosen for its large ring core diameter and low photosensitivity of the RCF.Additionally,a lateral offset splicing spot is introduced to couple the fundamental mode to the second-order modes.Switchable LP_(01)and LP_(11)mode lasers can be achieved.Meanwhile,azimuthally and radially polarized CVBs are successfully realized by adjusting the polarization controllers.
基金supported by the National Key R&D Program of China(No.2018YFB1800903)the National Natural Science Foundation of China(No.62005052)+2 种基金the Guangdong Introducing Innovative and Entrepreneurial Teams of“The Pearl River Talent Recruitment Program”(No.2019ZT08X340)the Guangdong Provincial Key Laboratory of Photonics Information Technology(No.2020B121201011)the Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education(Beijing Jiaotong University)(No.AON2019002)。
文摘We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber(MMF)and single-mode fiber(SMF)at the ends of the MMF as lead-in and lead-out.Due to the first segment of the MMF,the transmitted light is coupled into the ring core,silica center,and cladding of the RCF,exciting multiple modes in the RCF.By the modal interferences in the structure,bending sensing can be realized by interrogating the intensity of the interference dip.Experimental results show a high bending sensitivity of-25.63 dB/m^(-1)in the range of 1.0954 m^(-1)to1.4696 m^(-1).In addition,the advantages of the bend sensor,such as small size,low temperature sensitivity,and simple fabrication process,can be used for curvature measurement in building health monitoring.
基金Supported by the National Natural Science Foundation of China(No.20872108)
文摘The reaction of a ruthenium carbide complex RuCl2（C：）（PCy3）2 with [H（Et2O）x]＋[BF4]- at a molar ratio of 1：2 produced a two-core ruthenium carbene complex, {[RuCl（=CHPCy3）（PCy3）]2（μ-Cl）3}＋·[BF4]-, in the form of a yellow-green crystalline solid in a yield of 94%. This two-core ruthenium complex is a selective catalyst for ring closing metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed for N-substrates when the two-core ruthenium complex was used as the catalyst at an elevated temperature（137 °C）, indicating that the complex is a chemo-selective catalyst for ring closing metathesis reactions.
文摘通过中国知网(CNKI)与Web of Science(WOS)核心数据库,检索其中2004年~2024年所收录的环锭包芯纱相关中英文文献,采集相关文献数据。利用CiteSpace知识图谱工具,构建环锭包芯纱研究的知识图谱,对环锭包芯纱领域的年度发文量、作者和国家合作分布、研究热点与发展趋势进行可视化分析。研究发现:国内环锭包芯纱领域年度发文量总体上呈现逐年递减的趋势;国际年度发文量变化幅度较大,整体上是一个增长的态势。
