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面向片上传感量子级联激光器的研究进展(特邀)

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光子学报 2023年第10期52卷 101-115页

作者：周斌茹马钰张世晨刘峰奇陆全勇北京量子信息科学研究院量子材料与器件研究部北京100193 中国科学院物理研究所北京凝聚态物理国家实验室北京100190 中国科学院大学物理学院北京100049 中国科学院半导体研究所半导体材料科学重点实验室北京100083

作为一种新型半导体激光器,量子级联激光器因其独特的子带间跃迁机制,具有高速响应、高非线性、输出波长大范围可调等特点。近年来随着输出光功率和电光转化效率等性能指标的快速提升,量子级联激光器已成为中红外至太赫兹波段(波长约为3... 详细信息

作为一种新型半导体激光器,量子级联激光器因其独特的子带间跃迁机制,具有高速响应、高非线性、输出波长大范围可调等特点。近年来随着输出光功率和电光转化效率等性能指标的快速提升,量子级联激光器已成为中红外至太赫兹波段(波长约为3~300μm)的主流激光光源,在大气污染监控、气体检测、太赫兹成像、生物医疗以及空间光通信等领域具有重要科学意义和应用价值。本文阐释了量子级联激光器的发展历程以及工作原理;分别重点讨论了中红外量子级联激光器在高效率、大功率、波长可调谐以及片上传感的应用等方面的研究进展,并对基于中红外量子级联激光器差频太赫兹光源和光频梳的发展进行叙述,最后进行了简要总结与展望。

关键词：量子级联激光器片上传感光频梳太赫兹

Design of surface emitting distributed feedback quantum cascade laser with single-lobe far-field pattern and high outcoupling efficiency

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Chinese Physics B 2010年第5期19卷 320-326页

作者：郭万红刘俊岐陆全勇张伟李路王利军刘峰奇王占国 Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences

A 7.8-μm surface emitting second-order distributed feedback quantum cascade laser （DFB QCL） structure with metallized surface grating is studied. The modal property of this structure is described by utilizing coupled-mode theory where the coupling coefficients are derived from exact Floquet-Bloch solutions of infinite periodic structure. Based on this theory, the influence of waveguide structure and grating topography as well as device length on the laser performance is numerically investigated. The optimized surface emitting second-order DFB QCL structure design exhibits a high surface outcoupling efficiency of 22% and a low threshold gain of 10 cm-1. Using a π phase-shift in the centre of the grating, a high-quality single-lobe far-field radiation pattern is obtained.

关键词： quantum cascade laser Floquet-Bloch expansion distributed feedback lasers surface emission

Room-temperature continuous-wave InP-based 2.01 μm microcavity lasers in whispering-gallery modes with InGaAsSb quantum well

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Chinese Optics Letters 2023年第4期21卷 65-68页

作者：郭强强张锦川朱怡璇高旭陆全勇卓宁翟慎强刘俊岐王利军刘舒曼刘峰奇 Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Division of Quantum Materials and Devices Beijing Academy of Quantum Information SciencesBeijing 100193China

We demonstrated an electrically pumped InP-based microcavity laser operating in continuous-wave *** active region is designed with antimony surfactants to enhance the gain at 2 μm,and a selective electrical isolation scheme is used to secure continuous-wave operation for the microcavity laser at room *** lasers were fabricated as a notched elliptical resonator,resulting in a highly unidirectional far-field profile with an in-plane beam divergence of less than 2°.Single-mode emission was obtained over the entire dynamic range,and the laser frequencies were tuned linearly with the pumping ***,these directional lasers pave the way for portable and highly integrated on-chip sensing applications.

关键词： whispering-gallery mode continuous-wave operation electrical isolation directional emission

Analysis of surface emitting distributed-feedback quantum cascade laser based on a surface-plasmon waveguide

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Journal of Semiconductors 2010年第11期31卷 62-66页

作者：郭万红陆全勇刘俊岐张伟江宇超李路王利军刘峰奇王占国 Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences

An analysis of a surface emitting distributed-feedback quantum cascade laser（DFB QCL） based on a surface-plasmon waveguide is *** second-order grating realized by the sole patterning of the top metal provides strong *** analysis is based on a coupled-mode theory derived from exact Floquet-Bloch solutions of the infinite periodic *** surface outcoupling efficiency and threshold gain for the optimized device design are 43%and 12 cm-1,respectively,which represent great improvements on the conventional dielectric waveguide based DFB QCL with typical values of 17.5%and 20 cm-1.

关键词： quantum cascade laser distributed feedback lasers surface plasmon waveguide surface emission

Surface Emitting Distributed Feedback Quantum Cascade Laser around 8.3 μm

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Chinese Physics Letters 2010年第11期27卷 125-128页

作者：郭万红刘俊岐陆全勇张伟江宇超李路王利军刘峰奇王占国 Key Lab of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences P.O. Box 912 Beijing 100083

We demonstrate surface emitting distributed feedback quantum cascade lasers emitting at wavelengths from 8.1 μm at 90 K to 8.4 μm at 210 K. The second？order metalized grating is carefully designed using a modified coupled-mode theory and fabricated by contact lithography. The devices show single mode behavior with a side mode suppression ratio above 18 dB at all working temperatures. At 90 K, the device emits an optical power of 101 mW from the surface and 199 mW from the edge. In addition, a double-lobe far-field pattern with a separation of 2.2° is obtained in the direction along the waveguide.

关键词： Electronics and devices Optics quantum optics and lasers

Porous waveguide facilitated low divergence quantum cascade laser

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Journal of Semiconductors 2011年第6期32卷 51-54页

作者：尹雯陆全勇刘万峰张锦川王利军刘俊岐李路刘峰奇王占国 Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences

A quantum cascade laser with a porous waveguide structure emitting at 4.5μm is reported.A branchlike porous structure filled with metal material was fabricated on both sides of the laser ridge by an electrochemical etching *** contrast to the common ridge waveguide laser,devices with a porous structure give rather better beam *** this porous structure as a high-order mode absorber,the device exhibited fundamental transverse mode emission with a nearly diffraction limited far-field beam divergence angle of 4.9°.

关键词： quantum cascade laser ridge waveguide porous structure electrochemical etching

基于数字孪生的回转式空气预热器参数在线监测系统

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基于数字孪生的回转式空气预热器参数在线监测系统

作者：陆全西安理工大学

学位级别：硕士

回转式空气预热器是大型工业锅炉的主要部件之一,其主要功能是利用锅炉排放的废烟气预热即将进入锅炉燃烧的助燃空气,从而提高锅炉的热效率。但是回转式空气预热器在运行过程中存在与温度密切相关的漏风、热点和积灰三个痛点问题,严重... 详细信息

回转式空气预热器是大型工业锅炉的主要部件之一,其主要功能是利用锅炉排放的废烟气预热即将进入锅炉燃烧的助燃空气,从而提高锅炉的热效率。但是回转式空气预热器在运行过程中存在与温度密切相关的漏风、热点和积灰三个痛点问题,严重影响其工作效率。本文将智能检测和数字孪生技术相结合,设计了一套预热器参数在线监测系统,实时准确地监测预热器运行过程中的温度、形变等参数,对解决以上三大问题,保证预热器安全运行,提高机组整体效率具有重要意义。本文具体的研究工作如下:(1)创新性地提出一种预热器内部温度测量方案。通过在预热器内部布置分布式光纤测温系统,且光纤测温数据通过无线方式传输,实现预热器隔板的多点分布式测温。同时本文对系统的性能指标进行了实验验证,结果满足工程项目要求。(2)采用有限元数值模拟方法建立了预热器数字孪生传热模型,实现预热器转子整体温度和隔板形变参数的软测量。通过对波纹板的流场进行仿真计算获得了孔隙率、阻力系数,作为转子多孔介质模型的重要参数,在此基础上计算获得了转子的整体温度场分布,且计算结果与电厂设计值吻合较好,烟气、空气出口温度最大误差仅为2.89%,验证了转子多孔介质模型的准确性。最后将分布式光纤测温系统所采集的温度数据进行插值得到径向隔板的温度分布,作为隔板热变形模型的温度边界条件,通过计算获得了径向隔板的形变量参数,且模拟结果与经验公式吻合较好,误差仅为8.1%,验证了隔板热变形模型的准确性。(3)使用多种技术实现系统的可视化与数据传输。基于Unity 3D 平台搭建了预热器数字孪生可视化系统,对测量和计算得到的监测参数进行可视化映射;基于MQTT协议实现整个监测系统的实时数据传输与交互;基于APDL参数化编程技术实现有限元自动化仿真,保证预热器运行过程中参数在线计算。

关键词：回转式空气预热器数字孪生分布式光纤测温系统有限元数值模拟数据可视化

学习活动单元分析下高中语文项目化学习设计与实践--以必修下册第一单元为例

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中学语文 2024年第18期 73-75页

作者：陆全云南宣威市第一中学

在高中语文课堂教学改革持续发展的新时期,项目化学习得到学界的广泛关注。项目化学习的应用,改变了学生的语文学习方式。学习活动单元是统编版高中语文教材中新增的板块,必修下册第一单元选取了反映诸子百家学说的篇章,怎样设计项目化... 详细信息

在高中语文课堂教学改革持续发展的新时期,项目化学习得到学界的广泛关注。项目化学习的应用,改变了学生的语文学习方式。学习活动单元是统编版高中语文教材中新增的板块,必修下册第一单元选取了反映诸子百家学说的篇章,怎样设计项目化学习方案,是需要教师重点解决的问题。基于此,文章立足必修下册第一单元实际,围绕核心知识、驱动问题、活动形式、评价机制等基本要素,厚植项目化学习设计与实践研究,为学生提供科学的学习指导,使其能在活动中自主学习,提高单元教学有效性。

关键词：高中语文项目化学习学习活动单元教学策略

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为什么合声波成为了弥散极光形成的主因

Science Bulletin 2024年第5期69卷 597-600页

作者：高新亮马玖琦邵同陈瑞柯阳光陆全明 Deep Space Exploration Laboratory School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China

Earth’s diffuse aurora(structureless auroras,5-15 s pulsations and microbursts)occurs over a broad latitude range,which arises from the collision of energetic charged particles with atoms in the upper atmosphere[1].Diffuse aurora exists for most of the time,and intensifies during geo magnetically active periods[2].Although generally not visible to the naked eyes,it is the major source of energy input into the Earth’s nightside upper atmosphere[3].During magnetospheric substorms,~100 eV to 1 keV plasmasheet particles are injected into the midnight sector *** to the conservation of the particles’first two adiabatic invariants,the particles are energized to~10-100 keV energies.A mechanism that violates the first adiabatic invariant of electrons is required to scatter them to enter the atmospheric loss cone(a small cone of angle~3°wide at the equator)[4].

关键词： Earth latitude storm