Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extens...Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extensive attention due to their advantages of small size,high multiplexing efficiency,convenient mass production,and low cost.An RGB beam combiner based on directional couplers is designed,with a core-cladding relative refractive index difference of 0.75%.The RGB beam combiner is optimized from the perspective of parameter optimization.Using the beam propagation method(BPM),the relationship between the performance of the RGB beam combiner and individual parameters is studied,achieving preliminary optimization of the device’s performance.The key parameters of the RGB beam combiner are optimized using the entropy weight-technique for order preference by similarity to an ideal solution TOPSIS method,establishing the optimal parameter scheme and further improving the device’s performance indicators.The results show that after optimization,the multiplexing efficiencies for red,green,and blue lights,as well as the average multiplexing efficiency,reached 99.17%,99.76%,96.63%and 98.52%,respectively.The size of the RGB beam combiner is 4.768 mm×0.062 mm.展开更多
High-power ridge-waveguide tapered InGaAs-AlGaAs lasers emitting at 980nm were fabricated. Lasers with a total length L = 1850μm and different lengths of the ridge waveguide Lrw were processed to study the influence ...High-power ridge-waveguide tapered InGaAs-AlGaAs lasers emitting at 980nm were fabricated. Lasers with a total length L = 1850μm and different lengths of the ridge waveguide Lrw were processed to study the influence of the straight section on the spatial mode filtering. When Lrw is 450μm, the devices have the optimized maxi- mum output power and beam quality,and the output power P is 4. 28W. The beam propagation ratio M2 is 3. 79 at 1W.展开更多
O435 96063534光束通过棱镜的变换矩阵=The matrixes of abeam of light transmitting a prism[刊,中]/武星,吴福顺,何明霞,姚键铨(天津大学精密仪器工程系.天津(300072))//天津大学学报.-1995,28(6).-862-864利用光束斜入射到界面的变...O435 96063534光束通过棱镜的变换矩阵=The matrixes of abeam of light transmitting a prism[刊,中]/武星,吴福顺,何明霞,姚键铨(天津大学精密仪器工程系.天津(300072))//天津大学学报.-1995,28(6).-862-864利用光束斜入射到界面的变换矩阵,推导光束通过棱镜时在子午面和弧矢面的变换矩阵,并得出光束通过棱镜时所产生的像散与光束入射的位置、入射角及棱镜顶角相关的结论。图2参3(赵桂云)展开更多
TH776.1 99021372医用内窥镜导光束应力分析与其螺旋排列成型技术研制=Forced aralysis on light guide for medicalendoscope and technology[刊,中]/郭良,余亚梅,杜建红(成都军区后勤部医疗器械修理所.四川,成都(610017))∥测控技术....TH776.1 99021372医用内窥镜导光束应力分析与其螺旋排列成型技术研制=Forced aralysis on light guide for medicalendoscope and technology[刊,中]/郭良,余亚梅,杜建红(成都军区后勤部医疗器械修理所.四川,成都(610017))∥测控技术.—1998,17(2).—43-44针对内窥镜照明用纤维导光束较易损坏的问题,通过分析光导纤维受力情况,研究出螺旋排列纤维导光束的工艺方法。图2(李瑞琴)TH786 99021373人眼动态视力测试仪的研究=Research on humanmobile eyesight detector[刊,中]/林晓珑,辛德胜(吉林工业大学应用物理系.吉林,长春(130022)),朱宏志(长春市公路工程监理办公室.吉林,长春(130041))∥光学技术.—1998,(1).—81-83介绍了动态视力测试仪的原理和结构及测试过程,概述了动态视力测试的意义和国内外的进展情况及视力与车速的关系。该仪器采用微机管理及控制、自动进行数据采集、标准判别和结果打印,可作为各种交通工具的驾驶人员及运动员的动态、静态视力的检查仪器。展开更多
A windowed very small aperture laser (VSAL) source for use in high resolution near field optical data storage is fabricated.The windowed regions are introduced to avoid shorting the pn junction with metal coating a...A windowed very small aperture laser (VSAL) source for use in high resolution near field optical data storage is fabricated.The windowed regions are introduced to avoid shorting the pn junction with metal coating and suppress the COD effect.It facilitates producing VSAL by simplified technology and improves the laser performance.A VSAL with 400nm small aperture is demonstrated by focused ion beam (FIB) and the output power is 0 3mW at 31mA.展开更多
The optimum theory and methods were adopted to design the laser beam riding guidance anti tank missile's control system in the short run. Through building the mathematical model of system, selecting a proper meth...The optimum theory and methods were adopted to design the laser beam riding guidance anti tank missile's control system in the short run. Through building the mathematical model of system, selecting a proper method and taking advantage of computer's high speed calculation and logic traits, an optimal controller was designed. Simulation results showed that the designed control system has fair performance and it satisfies the tactical and technical requirements. The results also demonstrate that by the combination of the optimizing methods and the computer the control system could be designed as soon as possible.展开更多
We propose a fiber-to-waveguide coupler for side-illuminated p-i-n photodiodes to obtain high responsivity and low polarization dependence that is grown on InP substrate and is suitable for surface hybrid integration ...We propose a fiber-to-waveguide coupler for side-illuminated p-i-n photodiodes to obtain high responsivity and low polarization dependence that is grown on InP substrate and is suitable for surface hybrid integration in low cost modules. The fiber-to-waveguide coupler is based on a diluted waveguide,which is composed of ten periods of undoped 120nm InP/80nm InGaAsP （1.05μm bandgap） multiple layers. Using the semi-vectorial three dimensional beam propagation method （BPM） with the central difference scheme,the coupling efficiency of fiber-to-waveguide under different conditions is simulated and studied,and the optimized conditions for fiber-to-waveguide coupling are obtained. For TE-like and TM-like modes,the calculated maximum coupling efficiency is higher than 94% and 92% ,respectively. The calculated polarization dependence is less than 0. ldB,showing good polarization independence.展开更多
The fabrication of the oxidized porous silicon waveguide prism is reported by selectively electrochemical anodisation process. The direction changes of light beams in TE and TM polarization out of this waveguide prism...The fabrication of the oxidized porous silicon waveguide prism is reported by selectively electrochemical anodisation process. The direction changes of light beams in TE and TM polarization out of this waveguide prism were respectively measured,and the experimental results were analyzed.展开更多
The beams of 980nm high-power LDs are analyzed, and the reasons that aspect ratio of LD beams is high are explained. It is certified by the test that cylindrical lens can efficiently compress the perpendicular diverge...The beams of 980nm high-power LDs are analyzed, and the reasons that aspect ratio of LD beams is high are explained. It is certified by the test that cylindrical lens can efficiently compress the perpendicular divergence angle of the beam. Some typical and popular lensed fibers were compared and analyzed according to coupling characteristics. The factors which affect the coupling efficiency and tolerance of the wedged-shaped GRIN tipped lensed fiber are pointed out, and some methods to reduce the coupling loss of the lensed fibers are proposed finally.展开更多
Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wur...Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well （QW） are deduced via the method of electrostatic .potential expanding. The present theoretical scheme can naturally reduce to the results in symmetric wurtzite QW once a set of symmetric structural parameters are chosen. Numerical calculations on an asymmetric AlN/GaN/AIo,15 Gao.85N Wurtzite Q W are performed. A detailed comparison with the symmetric wurtzite QW was also performed. The results show that the structural asymmetry of wurtzite QW changes greatly the dispersion frequencies and the electrostatic potential distributions of the QC optical phonon modes.展开更多
基金Project(52175445)supported by the National Natural Science Foundation of ChinaProject(2022JJ30743)supported by the Natural Science Foundation of Hunan Province,China+1 种基金Project(2023GK2024)supported by the Key Research and Development Program of Hunan Province,ChinaProject(2023ZZTS0391)supported by the Fundamental Research Funds for the Central Universities of China。
文摘Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extensive attention due to their advantages of small size,high multiplexing efficiency,convenient mass production,and low cost.An RGB beam combiner based on directional couplers is designed,with a core-cladding relative refractive index difference of 0.75%.The RGB beam combiner is optimized from the perspective of parameter optimization.Using the beam propagation method(BPM),the relationship between the performance of the RGB beam combiner and individual parameters is studied,achieving preliminary optimization of the device’s performance.The key parameters of the RGB beam combiner are optimized using the entropy weight-technique for order preference by similarity to an ideal solution TOPSIS method,establishing the optimal parameter scheme and further improving the device’s performance indicators.The results show that after optimization,the multiplexing efficiencies for red,green,and blue lights,as well as the average multiplexing efficiency,reached 99.17%,99.76%,96.63%and 98.52%,respectively.The size of the RGB beam combiner is 4.768 mm×0.062 mm.
文摘High-power ridge-waveguide tapered InGaAs-AlGaAs lasers emitting at 980nm were fabricated. Lasers with a total length L = 1850μm and different lengths of the ridge waveguide Lrw were processed to study the influence of the straight section on the spatial mode filtering. When Lrw is 450μm, the devices have the optimized maxi- mum output power and beam quality,and the output power P is 4. 28W. The beam propagation ratio M2 is 3. 79 at 1W.
文摘O435 96063534光束通过棱镜的变换矩阵=The matrixes of abeam of light transmitting a prism[刊,中]/武星,吴福顺,何明霞,姚键铨(天津大学精密仪器工程系.天津(300072))//天津大学学报.-1995,28(6).-862-864利用光束斜入射到界面的变换矩阵,推导光束通过棱镜时在子午面和弧矢面的变换矩阵,并得出光束通过棱镜时所产生的像散与光束入射的位置、入射角及棱镜顶角相关的结论。图2参3(赵桂云)
文摘TH776.1 99021372医用内窥镜导光束应力分析与其螺旋排列成型技术研制=Forced aralysis on light guide for medicalendoscope and technology[刊,中]/郭良,余亚梅,杜建红(成都军区后勤部医疗器械修理所.四川,成都(610017))∥测控技术.—1998,17(2).—43-44针对内窥镜照明用纤维导光束较易损坏的问题,通过分析光导纤维受力情况,研究出螺旋排列纤维导光束的工艺方法。图2(李瑞琴)TH786 99021373人眼动态视力测试仪的研究=Research on humanmobile eyesight detector[刊,中]/林晓珑,辛德胜(吉林工业大学应用物理系.吉林,长春(130022)),朱宏志(长春市公路工程监理办公室.吉林,长春(130041))∥光学技术.—1998,(1).—81-83介绍了动态视力测试仪的原理和结构及测试过程,概述了动态视力测试的意义和国内外的进展情况及视力与车速的关系。该仪器采用微机管理及控制、自动进行数据采集、标准判别和结果打印,可作为各种交通工具的驾驶人员及运动员的动态、静态视力的检查仪器。
文摘A windowed very small aperture laser (VSAL) source for use in high resolution near field optical data storage is fabricated.The windowed regions are introduced to avoid shorting the pn junction with metal coating and suppress the COD effect.It facilitates producing VSAL by simplified technology and improves the laser performance.A VSAL with 400nm small aperture is demonstrated by focused ion beam (FIB) and the output power is 0 3mW at 31mA.
文摘The optimum theory and methods were adopted to design the laser beam riding guidance anti tank missile's control system in the short run. Through building the mathematical model of system, selecting a proper method and taking advantage of computer's high speed calculation and logic traits, an optimal controller was designed. Simulation results showed that the designed control system has fair performance and it satisfies the tactical and technical requirements. The results also demonstrate that by the combination of the optimizing methods and the computer the control system could be designed as soon as possible.
文摘We propose a fiber-to-waveguide coupler for side-illuminated p-i-n photodiodes to obtain high responsivity and low polarization dependence that is grown on InP substrate and is suitable for surface hybrid integration in low cost modules. The fiber-to-waveguide coupler is based on a diluted waveguide,which is composed of ten periods of undoped 120nm InP/80nm InGaAsP （1.05μm bandgap） multiple layers. Using the semi-vectorial three dimensional beam propagation method （BPM） with the central difference scheme,the coupling efficiency of fiber-to-waveguide under different conditions is simulated and studied,and the optimized conditions for fiber-to-waveguide coupling are obtained. For TE-like and TM-like modes,the calculated maximum coupling efficiency is higher than 94% and 92% ,respectively. The calculated polarization dependence is less than 0. ldB,showing good polarization independence.
文摘The fabrication of the oxidized porous silicon waveguide prism is reported by selectively electrochemical anodisation process. The direction changes of light beams in TE and TM polarization out of this waveguide prism were respectively measured,and the experimental results were analyzed.
文摘The beams of 980nm high-power LDs are analyzed, and the reasons that aspect ratio of LD beams is high are explained. It is certified by the test that cylindrical lens can efficiently compress the perpendicular divergence angle of the beam. Some typical and popular lensed fibers were compared and analyzed according to coupling characteristics. The factors which affect the coupling efficiency and tolerance of the wedged-shaped GRIN tipped lensed fiber are pointed out, and some methods to reduce the coupling loss of the lensed fibers are proposed finally.
基金The project supported by National Natural Science Foundation of China under Grant Nos. 60276004 and 6939007,3, the Scientilic Research Foundation for the Returned 0overseas Chinese Scholars State Education Ministry of China
文摘Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well （QW） are deduced via the method of electrostatic .potential expanding. The present theoretical scheme can naturally reduce to the results in symmetric wurtzite QW once a set of symmetric structural parameters are chosen. Numerical calculations on an asymmetric AlN/GaN/AIo,15 Gao.85N Wurtzite Q W are performed. A detailed comparison with the symmetric wurtzite QW was also performed. The results show that the structural asymmetry of wurtzite QW changes greatly the dispersion frequencies and the electrostatic potential distributions of the QC optical phonon modes.
