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Vertical cavity surface emitting laser transverse mode and polarization control by elliptical hole photonic crystal

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Chinese Physics B 2013年第2期22卷 261-264页

作者：曹田徐晨解意洋阚强魏思民毛明明陈弘达 Key Laboratory of Optoelectronics Technology(Beijing University of Technology) Ministry of Education State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorChinese Academy of Sciences

The polarization of traditional photonic crystal（PC） vertical cavity surface emitting laser（VCSEL） is uncontrollable,resulting in the bit error increasing *** hole photonic crystal can control the transverse mode and polarization of VCSEL *** analyze the far field divergence angle,and birefringence of elliptical hole PC *** the ratio of minor axis to major axis b/a = 0.7,the PC VCSEL can obtain single mode and *** to the simulation results,we fabricate the device *** output power is 1.7 mW,the far field divergence angle is less than 10°,and the side mode suppression ratio is over 30 *** output power in the Y direction is 20 times that in the X direction.

关键词： photonic crystal vertical cavity surface emitting laser(VCSEL) elliptical holes single mode polarization control

FEL polarization control studies on Dalian coherent light source

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Chinese Physics C 2013年第11期37卷 108-113页

作者：张彤邓海啸张未卿吴国荣戴东旭王东杨学明赵振堂 Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences

The polarization switch of a free-electron laser （FEL） is of great importance to the user scientific community. In this paper, we investigate the generation of controllable polarization FEL from two well-known approaches for Dalian coherent light source, i.e., crossed planar undulator and elliptical permanent undulator. In order to perform a fair comparative study, a one-dimensional time-dependent FEL code has been developed, in which the imperfection effects of an elliptical permanent undulator are taken into account. Comprehensive simulation results indicate that the residual beam energy chirp and the intrinsic FEL gain may contribute to the degradation of the polarization performance for the crossed planar undulator. Tile elliptical permanent undulator is not very sensitive to the undulator errors and beam imperfections. Meanwhile, with proper configurations of the main planar undulators and additional elliptical pernmuent undulator section, circular polarized FEL with pulse energy exceeding 100 bt.J could be achieved at Dalian coherent light source.

关键词： crossed planar undulator elliptical permanent undulator PELICAN polarization control slippage

Uniformly high-speed semi-open loop polarization control and PMD suppression

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Chinese Optics Letters 2020年第5期18卷 1-5页

作者： Boehen Wang Zhengyong Li Key Laboratory of Luminescence and Optical Information Technology Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China

We propose and demonstrate a novel scheme of semi-open-loop polarization control(SOL-PC), which controls the state of polarization(SOP) with high accuracy and uniform high speed. For any desired SOP, we first adjust the initial SOP using open-loop control(OLC) based on the matrix model of a three-unit piezoelectric polarization controller, and quickly move it close to the objective one. Then closed-loop control(CLC) is performed to reduce the error and reach precisely the desired SOP. The response time is three orders faster than that of the present closed-loop polarization control, while the average deviation is on par with it. Finally, the SOL-PC system is successfully applied to realize the suppression of the polarization mode dispersion(PMD) effect and reduce the first-order PMD to near zero. Due to its perfect performance, the SOL-PC energizes the present polarization control to pursue an ideal product that can meet the future requirements in ultrafast optical transmission and quantum communication.

关键词： polarization control polarization mode dispersion fiber optics components coherent comm unications

Fabrication of polarization control Devices Using Metal Grating Structures

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Optics and Photonics Journal 2022年第9期13卷 201-213页

作者： Atsushi Motogaito Yukino Hayashi Akinori Watanabe Kazumasa Hiramatsu Graduate School of Engineering Mie University Tsu Japan

A polarization control device was developed using a plasmonic metasurface with the aim of achieving the desired polarization state. In this study, the Ag metal grating structure was fabricated as a plasmonic metasurface by electron beam lithography and a lift-off process. The phase difference of the fabricated sample was 21.0°. This value is almost consistent with the simulation (24.0°). Then, the transmission and phase difference is dependent on the structural parameter. Because of the propagation of surface plasmon polariton at the interface between Ag and SiO2 or Ag and air, it is believed that the transmittance and the phase difference for TM polarized light can be controlled by the structural parameters. By plotting on the Poincaré sphere after calculating the S-parameter by simulation, it is clear that the arbitrary polarization status can be controlled by the structural parameter.

关键词： Surface Plasmon Metal Grating polarization control Plasmonic Metasurface

Invisible Code Display for Robots’ Eye Communication Using polarization control by LCD Panel

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Invisible Code Display for Robots’ Eye Communication Using ...

Spatial light modulation for femtosecond laser manufacturing:Current developments and challenges

2010亚洲光电子会议LED和显示技术分会场

作者： Kunio Sakamoto Takeru Furukawa Faculty of Intelligence and Informatics Konan University 8-9-1 OkamotoHigashinadaKobeHyogo 658-8501Japan

An invisible code is one of the useful technologies for a computer *** this paper,we propose a method to display invisible codes using LCD panels and to detect a polarized symbol image with a conventional CCD *** authors have been developing the mobile robots which can cooperation between *** robots should communicate with each other in order to cooperate ***,the communication between robots is very important problem to be *** robots generally utilize wireless transmission *** transmission sets send and receive on the same frequency or channel to establish the radio *** is called working *** robots cannot start communication if both sets use different frequency *** is important to perform an initial configuration for establishing the radio signal transmission at a first contact among strange mobile *** solve this problem,this paper describes an information transmission system using an invisible code on displays which show an expression of robot’s eyes.

关键词： polarization control invisible code two-dimensional code polarized imaging adaptive user interface

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Science China(Technological Sciences) 2024年第1期67卷 60-72页

作者： ZANG Xue LIU ZiTing XU YiShi WANG Yi WANG Qing LI ZhenZe WANG Lei State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Precision Measurement and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Since the invention of lasers,spatial-light-modulated laser processing has become a powerful tool for various *** enables multidimensional and dynamic modulation of the laser beam,which significantly improves the processing efficiency,accuracy,and flexibility,and presents wider prospects over traditional mechanical technologies for machining three-dimensional,hard,brittle,or transparent *** this review,we introduce:(1)The role of spatial light modulation technology in the development of femtosecond laser manufacturing;(2)the structured light generated by spatial light modulation and its generation methods;and(3)representative applications of spatial-light-modulated femtosecond laser manufacturing,including aberration correction,parallel processing,focal field engineering,and polarization ***,we summarize the present challenges in the field and possible future research.

关键词： femtosecond laser manufacturing spatial light modulation structured light aberration correction parallel processing focal field engineering polarization control

High power linearly polarized fiber laser：Generation, manipulation and application

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Science China(Technological Sciences) 2017年第12期60卷 1784-1800页

作者： ZHOU Pu HUANG Long XU JiangMing MA PengFei SU RongTao WU Jian LIU ZeJin College of Optoelectronic Science and Engineering National University of Defense Technology Changsha 410073 China

Linearly-polarized(LP) fiber lasers, which could find wide potential applications such as coherent detection, coherent/spectral beam combining, nonlinear frequency conversion, have been a research focus in recent years. In this paper, we will present a general review on the achievements of various kinds of high power LP fiber laser and its applications for the first time. The recent progress in high power LP fiber oscillator, including fiber oscillator based on active fiber, Raman fiber laser and Random distributed feedback fiber laser are summarized. Power scaling of LP fiber laser by using active-fiber based power amplifier, passive-fiber based Raman amplifier, and active/passive fiber based hybrid fiber amplifier has been achieved. polarization-maintained active fiber based power amplifier and non-polarization-maintained active fiber based power amplifier incorporating active polarization control are specially introduced in detail. High power LP fiber laser with diversified property, such as narrow-linewidth, wavelength-tunable and ultrashort pulse operation, are summarized. Various kinds application of high power LP fiber laser, including beam combining,supercontinumm generation, mid-infrared lasing, structured light field and ultrasonic generation, are presented at the end of this paper.

关键词： linear polarized fiber laser high power raman fiber laser polarization control pulsed fiber laser

Manipulating electromagnetic waves with metamaterials: Concept and microwave realizations

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Chinese Physics B 2014年第4期23卷 52-63页

作者：何琼孙树林肖诗逸李欣宋争勇孙午炯周磊 State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures Ministry of Education) Fudan University Department of Optical Science and Engineering and Shanghai Ultra-Precision Optical Manufacturing Engineering CenterFudan University

Our recent efforts in manipulating electromagnetic （EM） waves using metamaterials （MTMs） are reviewed with em- phasis on 1） manipulating wave polarization and transporting properties using homogeneous MTMs, 2） manipulating surface-wave properties using plasmonic MTMs, and 3） bridging propagating and surface waves using inhomogeneous meta-surfaces. For all these topics, we first illustrate the physical concepts and then present several typical practical real- izations and applications in the microwave regime.

关键词： metamateials inhomogeneous meta-surface polarization control light-matter interaction

Transmissive 2-bit anisotropic coding metasurface

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Chinese Physics B 2022年第9期31卷 554-560页

作者： Pengtao Lai Zenglin Li Wei Wang Jia Qu Liangwei Wu Tingting Lv Bo Lv Zheng Zhu Yuxiang Li Chunying Guan Huifeng Ma Jinhui Shi Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of ScienceHarbin Engineering UniversityHarbin 150001China College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096China School of Electronic Science Northeast Petroleum UniversityDaqing 163318China Synergetic Innovation Center of Wireless Communication Technology Southeast UniversityNanjing 210096China

Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic ***,archiving transmissive coding metasurface is still *** we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal *** polarization beam splitter and the orbital angular momentum(OAM)generator have been studied as typical applications of the anisotropic 2-bit coding *** simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions,*** anisotropic coding metasurface has been experimentally verified to realize an OAM beam with l=2 of right-handed polarized wave,resulting from both contributions from linear-to-circular polarization conversion and the phase profile *** work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.

关键词： transmissive coding metasurfaces polarization control orbital angular momentum