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The optical phased array controls the emission beam by adjusting the phase of the array antenna to change the wave-front, thus achieving control over the emission beam. Optical phased array technology has great potential applications in areas such as laser radar, laser communication, high-brightness laser generation, and synthetic aperture detection. This article reviews the re-search progress, advantages, and disadvantages of liquid crystal phased arrays, micro-electro-mechanical system phased arrays, and optical waveguide phased arrays. It also delves into the optical waveguide phased array technology in laser radar, proposing break-through directions for this technology.

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光学相控阵通过对阵列天线相位的调节以改变发射波束的波前,从而实现对发射波束的控制。光学相控阵技术在激光雷达、激光通信、高亮度激光生成、合成孔径探测等领域极具应用潜力。本文综述了液晶相控阵、微机电系统相控阵和光波导相控阵的研究进展以及优缺点,并对激光雷达中的光波导相控阵技术进行了深入思考,提出了光波导相控阵技术的突破方向。

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潘超 1981年生,博士,研究员。

于勇 1971年生,博士,研究员。

刘宇哲 1989 年生,博士,高级工程师。

崔铮 1987年生,博士,工程师。

刘雅琦 1993年生,博士,工程师。

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潘超 1981年生,博士,研究员。

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崔铮 1987年生,博士,工程师。

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崔铮 1987年生,博士,工程师。

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Review of optical phased array technology and its applications[J]. High Power Laser and Particle Beams, 2023, 35(4): 1-22., articleTitle=Review of optical phased array technology and its applications, refAbstract=null), Reference(id=1241431115299344398, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431095850357312, doi=null, pmid=null, pmcid=null, year=1972, volume=11, issue=3, pageStart=613, pageEnd=616, url=null, language=null, rfNumber=[2], rfOrder=2, authorNames=MEYER R A, journalName=Applied Optics, refType=null, unstructuredReference=MEYER R A. Optical beam steering using a multichannel lithium tantalate crystal[J]. 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label=图20, caption=上海交通大学的多波束OPA芯片, figureFileSmall=Di7ucFO+NHLrn4NHYcFQTA==, figureFileBig=gBZG6zDR5Y8Rr0J+Sb/WMg==, tableContent=null), ArticleFig(id=1241431114909274119, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431095850357312, language=EN, label=Table 1, caption=

Comparison of three optical phasing properties

, figureFileSmall=null, figureFileBig=null, tableContent=
光学相控阵波长视场角调制频率效率其他
液晶相控阵400 nm~1 650 nm/1 850 nm~2 050 nm<20°<10 kHz80%~95%损伤阈值可达~10 MW/cm2(脉冲)
MEMS相控阵光波导相控阵—0.9 μm~3.5 μm<10°<51°1 kHz~100 kHz100 kHz以上99.9%<50%功率阈值高、偏振无关、反射式功率阈值低、集成度高、效率低
), ArticleFig(id=1241431115014131720, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431095850357312, language=CN, label=表1, caption=

三种光学相控阵性能对比

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光学相控阵波长视场角调制频率效率其他
液晶相控阵400 nm~1 650 nm/1 850 nm~2 050 nm<20°<10 kHz80%~95%损伤阈值可达~10 MW/cm2(脉冲)
MEMS相控阵光波导相控阵—0.9 μm~3.5 μm<10°<51°1 kHz~100 kHz100 kHz以上99.9%<50%功率阈值高、偏振无关、反射式功率阈值低、集成度高、效率低
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光学相控阵技术发展及其在激光雷达方向的应用思考
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潘超 , 于勇 , 刘宇哲 , 崔铮 , 刘雅琦
遥测遥控 | 雷达与对抗 2024,45(6): 99-111
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遥测遥控 | 雷达与对抗 2024, 45(6): 99-111
光学相控阵技术发展及其在激光雷达方向的应用思考
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潘超, 于勇, 刘宇哲, 崔铮, 刘雅琦
作者信息
  • 北京遥测技术研究所 北京 100094
  • 潘超 1981年生,博士,研究员。

    于勇 1971年生,博士,研究员。

    刘宇哲 1989 年生,博士,高级工程师。

    崔铮 1987年生,博士,工程师。

    刘雅琦 1993年生,博士,工程师。

Optical Phased Array Technology Development and Its Application Thinking in the Direction of LIDAR
Chao PAN, Yong YU, Yuzhe LIU, Zheng CUI, Yaqi LIU
Affiliations
  • Beijing Research Institute of Telemetry, Beijing 100094, China
doi: 10.12347/j.ycyk.20240513002
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光学相控阵通过对阵列天线相位的调节以改变发射波束的波前,从而实现对发射波束的控制。光学相控阵技术在激光雷达、激光通信、高亮度激光生成、合成孔径探测等领域极具应用潜力。本文综述了液晶相控阵、微机电系统相控阵和光波导相控阵的研究进展以及优缺点,并对激光雷达中的光波导相控阵技术进行了深入思考,提出了光波导相控阵技术的突破方向。

光学相控阵  /  激光雷达  /  光束扫描

The optical phased array controls the emission beam by adjusting the phase of the array antenna to change the wave-front, thus achieving control over the emission beam. Optical phased array technology has great potential applications in areas such as laser radar, laser communication, high-brightness laser generation, and synthetic aperture detection. This article reviews the re-search progress, advantages, and disadvantages of liquid crystal phased arrays, micro-electro-mechanical system phased arrays, and optical waveguide phased arrays. It also delves into the optical waveguide phased array technology in laser radar, proposing break-through directions for this technology.

Optical phased array  /  Laser radar  /  Beam scanning
潘超, 于勇, 刘宇哲, 崔铮, 刘雅琦. 光学相控阵技术发展及其在激光雷达方向的应用思考. 遥测遥控, 2024 , 45 (6) : 99 -111 . DOI: 10.12347/j.ycyk.20240513002
Chao PAN, Yong YU, Yuzhe LIU, Zheng CUI, Yaqi LIU. Optical Phased Array Technology Development and Its Application Thinking in the Direction of LIDAR[J]. Journal of Telemetry, Tracking and Command, 2024 , 45 (6) : 99 -111 . DOI: 10.12347/j.ycyk.20240513002
光学相控阵(Optical Phased Array,OPA)技术通过对主动阵列光场的相位调控,实现光束的高精度控制和多波束智能扫描。与微波相控阵技术相比,两种相控阵技术原理相同,但OPA技术受限于光波的高频和短波特性,直至基于钽酸锂晶体移相器的出现,该技术可行性才被证实[1]。OPA技术最早应用于自适应光学领域,用于对大气链路湍流畸变进行补偿[24],以及合成孔径高分辨率探测[5]。随着材料科学、激光技术等先进科学技术的发展,OPA技术被逐渐推广到激光雷达、激光通信和高亮度激光等领域[68]
激光雷达作为一种主动探测及测距系统,得益于出射激光束较短的发射波长、良好的方向性和单色性等特点,实现了高精度、高分辨率的测量与成像,在军事科学、航空航天、精密制造等领域发挥着重要的作用[911]。随着半导体技术的发展,激光雷达开始进入无人机、服务型机器人、智能医疗及地图测绘等民用领域[1215]。近年来,得益于无人驾驶技术的发展,激光雷达的市场需求迅速扩大,2023年Yole Intelligence发布的报告[16]预计,到2028年,汽车激光雷达市场将达到44.8亿美元,复合年增长率高达55%。
OPA技术作为全固态激光雷达实现的新途径,与机械式激光雷达[17]和混合固态激光雷达[18,19]相比,OPA式全固态激光雷达彻底抛弃了机械部件,具有不受惯性约束、无机械磨损的特点。与闪光(Flash)式全固态激光雷达[20]相比,OPA式全固态激光雷达发出的激光信号更集中于部分区域甚至“一点”,而整个视场范围,具有探测距离更远、探测精度更高的特点。同时,OPA技术与标准集成光子组件(如调制器和检测器)相结合可实现芯片级系统,大大降低系统复杂度、重量及功耗,解决了体积大、稳定性差等问题[21,22]。因此,OPA技术成为最具有发展前景的激光雷达技术。
OPA技术[23]是OPA式全固态激光雷达中的最核心技术。目前,OPA技术的主要实现方式有:液晶阵列[24,25]、微机电系统(MEMS)[26]、光波导阵列[27]等。液晶阵列具有驱动电压低、双折射率高、制造工艺成熟等优点,是目前OPA技术最成熟的实现方式。用于光扫描的MEMS早期专注于成像应用领域[28],如共焦显微镜、条形码读取和指纹传感等。但随着无人驾驶技术的发展,受扫描速度和可靠性的限制,传统的机械式扫描激光雷达无法大规模应用,因此,多家激光雷达厂商采用MEMS微振镜替代机械式扫描结构[29,30]。光波导阵列相控阵技术最初由Acoleyen等人[31]于2009年提出,经过十几年的发展,其在规模、性能和系统集成方面取得了巨大进步,并已在各种集成光子学平台中实现,如Si、InP、Ⅲ/V混合平台、CMOS工艺,以及具有集成掺铒激光器的定制工艺等。随着半导体工艺的进步,尤其是与CMOS工艺线相兼容的绝缘体上硅(SOI)技术的发展[32],使大规模硅光子集成制造成为可能,为光波导阵列的发展提供了巨大的助力[33,34]
本文综述了OPA技术的原理、技术研究进展以及各种实现方式的优缺点。此外,为应对激光雷达大范围覆盖、远距离探测、高帧率、小型化的发展需求,对在激光雷达应用中的光波导相控阵技术进行了深入思考,提出了技术突破的方向。
相控阵技术利用阵列中每个天线间的相对相位关系,通过构造干涉来重构电磁波的辐射场,在不移动天线面的情况下,对发射电磁波的偏转方向和扫描范围进行控制。光波是一种电磁波,其空间传输严格服从麦克斯韦方程。OPA技术通过对阵列光束进行相位控制,使不同发射单元之间形成固定相位差,从而使各发射单元发射的子光束,其远场的等相位面不再垂直于初始出射方向,各子波在远场发生干涉。最终使得光束在某一方向上因干涉加强而集中,在其他方向上因干涉相消而减弱,从而改变光束的传播方向,实现扫描[35,36]
一维OPA扫描基本原理,如图1所示。由N个阵元组成的一维相控阵阵列,各阵元间距相等为d,则相邻阵列的光束到达等相位面的光程差表达式为:
ΔR=d×sinθ
其中,θ为相控阵波束出射角度。OPA相邻波束相位差与光程差∆R的关系为:
由式(1)、式(2)可知,相控阵相邻光束相位差与波束偏转角的关系为:
因此,改变相邻波束的波前相位差,即可实现波束指向的变化,从而实现波束扫描。
液晶具有较高的双折射率,可以在较低的驱动电压下实现较大的光程差。液晶相控阵通过调节相邻液晶阵元的相位差,改变出射光的等相位面来实现光束偏转,其光束偏转原理如图2所示。为使相邻液晶阵元达到足够的相位差,液晶移相器需要具有足够的厚度,这也导致液晶移相器响应时间和光损耗的增大。目前,液晶移相器的响应时间约为ms量级,对应频率为kHz量级,采用双频液晶技术可将频率提升到10 kHz量级,但仍很难满足激光雷达对光束快速指向的需求。另外,液晶移相器的相位回扫现象和非线性效应对偏转效率也有较大影响,尤其在大角度偏转时,相位回扫引起的边缘效应导致的效率下降尤为严重,角度偏转误差增加,这也限制了液晶的偏转角度范围。
美国Meadowlark公司陆续推出多款液晶相控阵,如图3所示。2016年,推出的ODPDM512型[38]液晶相控阵,液晶微显示器分辨率为512×512像素,单个阵元大小为15 μm×15 μm;2021年,推出的E-SERIES型液晶相控阵[39],液晶微显示器分辨率为1 920×1 200像素,单个阵元大小为8 μm×8 μm;2022年,推出1 024×1 024型液晶相控阵[40],液晶微显示器分辨率为1 024×1 024像素,单个阵元大小为17 μm×17 μm。可根据不同的工作波长(400 nm~1 650 nm)定制液晶相控阵,据称激光损伤阈值可达10 W/cm2(连续波),脉冲激光损伤阈值可达10 MW/cm2,但由于阵元大小限制,其扫描角度在10°左右。
德国Holoeye公司陆续推出多款液晶空间光调制器,如图4所示。2012年,推出的LC2012型液晶相控阵[41],液晶微显示器分辨率为1 024×768像素,单个阵元大小为36 μm×36 μm,工作波长范围覆盖420 nm~800 nm;2019年,推出的GAEA-2型液晶相控阵[42],液晶微显示器分辨率为4 160×2 464像素,单个阵元大小为3.4 μm×3.4 μm,可根据工作波长范围420 nm~650 nm、650 nm~1 100 nm和1 400 nm~1 700 nm选择具体型号;2020年,推出的LUNA型液晶相控阵[43],液晶微显示器分辨率为1 920×1 080像素,单个阵元大小为4.5 μm×4.5 μm,工作波长范围覆盖420 nm~1 100 nm,帧率为60 Hz;推出的ERIS型液晶相控阵[44],液晶微显示器分辨率为1 920×1 200像素,单个阵元大小为8 μm×8 μm。
2020年,日本Hamamatsu公司研制出了一款耐光强度达400 GW/cm2的液晶空间光调制器[45],如图5(a)所示,其像素阵元为1 272×1 024,阵元宽度为12.5 μm,填充因子为95%,帧率为60 Hz,在1 550 nm的近红外波段附近衍射效率可达97%。2022年,该公司将SLM的有效面积扩大为现有尺寸的4倍,减少单位面积的入射光能量,更适用于高功率激光器。2023年,该公司推出X15213型产品[46]和X15223型产品[47],如图5(b)图5(c)所示。液晶微显示器分辨率为1 272×1 024像素,单个阵元大小为12.5 μm×12.5 μm,可根据工作波长范围400 nm~1 600 nm和1 850 nm~2 050 nm选择具体型号。
液晶调制速度较慢、帧率较低,且通常由于工艺限制导致扫描范围小,难以满足激光雷达光束指向快速控制、大范围扫描的需求。但目前液晶相控阵研究最为成熟,且随着对液晶的电极材料、散热技术等方面研究的深入,液晶的耐受功率密度大大提高。
MEMS主要由静电、电磁、压电和电热等方式驱动微反射镜实现光束偏转,由于具有移动部件,使得这些方式的MEMS与相控阵固态器件有一定区别。但MEMS也可以通过微小位移产生光程差,通过对入射光相位的调制来实现光束偏转,应用这一原理的MEMS器件也属于固态相控阵范畴。
2013年,Byung Wook Yoo 等人[48]针对早期MEMS反射镜需要在致动器顶部涂覆反射膜,从而限制了其在高光功率密度下应用的技术问题,提出了一种基于高对比度光栅(HCG)的MEMS相控阵技术,该MEMS相控阵具有响应时间快速(μs量级)、驱动电压低和耐受功率密度高的特点,并在SOI晶片上制备了8×8阵元的MEMS相控阵,对1 550 nm激光的反射率达到99.9%,填充因子为36%,如图6所示。
2014年,UCB(加利福尼亚大学伯克利分校)的Weijian Yang[49]制作了8×8阵元的高对比度光栅(HCG)阵元MEMS相控阵,如图7所示。材料为GaAs/AlGaAs,通过对HCG较小驱动距离的调节可以对反射光束的相位进行有效调谐。MEMS相控阵工作波长为1 550 nm,阵元尺寸约33.5 μm×33.5 μm,在10V电压下可产生1.7π的相移,具有0.52 MHz的响应速度,总视场约为2.65°,利用透镜系统扩大视场后其远场总视场角为9.14°。
2018年,加州大学Youmin Wang等人[50]制作了具有160×160阵元的MEMS相控阵,首次在MEMS相控阵上同时实现了光学效率高、响应时间快和偏转角度大的功能,如图8所示。阵列尺寸为3.1 mm×3.2 mm,工作波长为1 550 nm,10.5 V电压下产生2π相移,其光束扫描覆盖角度范围为6.6°×4.4°,光束发散角为0.042°×0.031°,调制频率为55 kHz,光反射效率约为85%。
2021年,多伦多大学的Tarek Mohammad等人[51]研发了基于节距调谐的硅微透镜MEMS相控阵,其具有平面内螺距调谐能力,可实现激光束指向高速和高分辨率转向,如图9所示。阵元尺寸约为195 μm×185 μm,阵列填充系数为40%~57%;在30 V电压下,工作波长为650 nm时,光束扫描范围为0.06°,角分辨率为0.002°。
基于MEMS器件的OPA具有扫描速度快、能耗低的特点,但目前采用这种方式制备的OPA扫描角度有限,另外整个器件的结构也较为复杂,离实用尚有一段距离。
随着半导体技术的发展,基于半导体集成光电器件的光波导相控阵开始出现,如铝砷化镓(Al-GaAs)相控阵、氮化硅(SiN)波导相控阵、硅(Si)基相控阵等。光波导相控阵可与片上的半导体激光器、放大器,甚至使用在接收端的探测器等集成在一块芯片上,实现单片集成的全固态激光雷达系统。这类集成器件通常利用辐射光栅天线实现激光的垂直发射,使用热光效应和波长调谐可实现两个维度的光束扫描。此外,依托于成熟的CMOS工艺线和半导体技术(特别是1 550 nm波段的硅基器件技术),提高了光波导相控阵的工艺稳定性,并降低了生产成本。
2013年,麻省理工学院(MIT)Yaacobi组的Sun J等人[52]在Nature上发表了二维大规模硅基OPA器件的研究成果。通过热光调相实现8×8阵元的光栅辐射阵列光束偏转角度达到6°×6°,π相移消耗功率8.5 mW,如图10所示。
2014年,MIT的Yaacobi组研发了高速大角度一维扫描的硅基相控阵[53],测试得到的光束扫描图,如图11所示。该相控阵采用热光效应实现光束扫描,工作波长为1 550 nm时,扫描角度达到51°,调制频率可达100 kHz。仿真估计该器件效率约为25%。
2015年,UCSB(加利福尼亚大学圣芭芭拉分校)的Hulme等人[54]报道了硅基混合集成的二维扫描相控阵,其将164个光学元件进行集成,包括激光器、放大器、探测器、相位调节器、光栅耦合器、分束器以及光子晶体透镜,如图12所示。实现的扫描角度范围为23°×3.6°,光束发散角为1°×0.6°,背景抑制比为5.5 dB。
2020年,北京大学Haiyang Zhang等人[55]研发了8×8阵元的二维OPA,光束由硅相位调制器进行电光调制,通过干涉技术校准随机分布的初始相位,实现了0.92°×0.32°的主瓣宽度,以及8.9°×2.2°的波束扫描范围,如图13所示。
2021年,吉林大学Li等人[56]设计了两种基于SiN-on-SOI平台的128通道OPA,利用两种双面光栅天线来实现高发射指向性。鱼骨天线OPA实现了100°×19.4°视场,波束发散度为0.021°×0.029°,链式天线OPA实现了140°×19.23°视场,波束发散度为0.021°×0.1°,如图14所示。
2021年,美国Pointcloud公司的Christopher Rogers等人[57]在《Nature》上提出了一种通用的固态3D成像芯片体系结构,并将16通道发射光栅、512个像素的光学外差探测器阵列与集成电子读取架构集成在单个芯片上,如图15所示。在发射功率为4 mW,距离为70 m时,测量精度为mm量级。
2022年,丹麦技术大学的Yong Liu等人[58]提出了一种二维OPA芯片结构,光纤发出的光束通过光栅耦合器和星形耦合器以高斯型振幅分布到64个通道,然后将64个通道中的光束汇聚到一个半波长间隔波导阵列中,并通过梯形平板光栅发射到远场,如图16所示。实现了低副瓣电平的高质量光束输出,且在180°视场范围内光束无混叠转向。当光束在-40°~40°转动时,在整个180°视场范围内低副瓣电平<-19 dB。
2023年,加州大学Michael Nickerson等人[59]在砷化镓光子集成电路平台上,制备了一种工作在1 064 nm附近的16通道OPA,该阵列波束宽度为0.92°,无光栅瓣转向范围为15.3°,副瓣抑制为12 dB。光子集成电路的足迹尺寸为5.2 mm×1.2 mm,单个波导输入宽度为5 μm,随后逐渐变细至2 μm,并通过1×2多模干涉耦合器的级联树分裂成16个相等的通道,每个通道尺寸均为3 mm×2 mm,如图17所示。同年,加州大学的Hani Nejadriahi等人[60]报道了利用富硅的氮化硅(SRN)实现宽转向端射面的OPA,在1 525 nm波长下,端射面天线波束转向大于115°,轴视处光束宽带为6.3°,如图18所示。
2023年,清华大学Yue等人[61]研发了一种基于膜铌酸锂材料的16通道集成OPA,该OPA工作在近红外波段,具有24°×8°的二维光束转向角,远场光束发散度为2°×0.6°,副瓣抑制水平为10 dB,如图19所示。
2024年,上海交通大学Zuoyu Zhou等人[62]设计了一种波长辅助二维波导型多波束OPA芯片,芯片尺寸为3.5 mm×2.1 mm,其发射孔径由1.55 μm的光栅耦合器组成,波束发散角(FWHM)为3.2°×3.91°,在相控阵扫描轴方向和波长调谐扫描轴方向的60°×8°视场范围内,该芯片能够同时实现多波束工作,如图20所示。
随着人工智能、5G技术的发展,激光雷达已成为新技术革命的强大助力,高可靠性、低成本的OPA式全固态激光雷达将是“最具前途”的激光雷达。当前,OPA式全固态激光雷达技术还不够成熟,一旦相关光学集成工艺技术得到突破,OPA式全固态激光雷达将在军事、民用领域具有广阔的应用前景。此外,对OPA式全固态激光雷达的研究,不仅是对高性能OPA技术的研究,还需要对整个激光雷达系统进行深入研究,以满足实际工程的应用需求。由OPA技术研究进展可知,液晶相控阵器件已推出商用化产品,而MEMS和光波导相控阵器件仍处在实验室阶段或初期应用阶段。OPA技术的三种实现方式性能对比,如表1所示。液晶相控阵最为成熟、应用最为广泛,但其调制频率慢、扫描角度小。MEMS相控阵调制频率高、扫描角度有限,其性能与偏振无关,在激光雷达系统中应用时仍需要与其他光学系统配合实现更大视场,且通常为反射式。光波导相控阵具有扫描精度高、响应速率快、集成度高等优势[63],存在很大的应用潜力,极有可能实现大规模、低成本与商用化。
虽然光波导相控阵存在很大的应用潜力,但光波导相控阵的劣势(或者说目前还无法实际应用落地的原因)也十分明显。第一,光波导相控阵的功率阈值低,限制了其高功率激光出射能力,对于远距离探测较难实现;第二,基于半导体的调相阵列常使用热光调相,调制速率慢导致激光雷达的帧率低,由于相邻阵元间的热隔离较差,在相位调制时会引起出射光功率产生波动,当前光波导光学相控阵还不能同时满足低损耗和快速工作响应的需求;第三,由于工艺难度大,光波导相控阵为实现大范围扫描,需要阵元周期结构足够小,以降低周期结构所引起的旁瓣对单波束扫描范围的限制;第四,由于二维控制电路复杂,二维扫描光波导相控阵需要二维架构的控制线路,这再次增大了工艺难度。因此,为了适应激光雷达大覆盖范围、远距离探测、高帧率、小型化的发展需求,光波导相控阵需要在以下几个方面寻求技术突破。
① 应用多光束扫描方式,提高角度覆盖范围及帧率。
目前,单光束扫描的光波导相控阵的角度覆盖范围尚可。但是,若利用大角度覆盖的多光束并行输出,结合小范围的角度扫描将会进一步提高角度覆盖范围。同时,与同样扫描角度覆盖范围的单光束扫描方式相比,在每帧数据分辨率相等、扫描部件频率一致(即扫描角度步长相等、每步用时相等)的情况下,多光束扫描方式由于其单次发射接收数据量更多,可在更短时间内完成一帧数据的测量,帧率会更高。多光束扫描方式可通过改变光栅天线的结构实现,可行性较大。
② 与铌酸锂调制器异质混合集成,提高调制频率。
薄膜铌酸锂调制器常用于1 550 nm的光纤通信领域,调制频率可达100 GHz量级,其与半导体光电器件制作工艺相同,只在衬底材料上存在差异。因此,可以考虑将高速的铌酸锂调制器与其他片上波导和光栅天线作异质集成,提高相控阵调制频率,实现激光雷达系统的高速扫描。
③ 应用锁相相干技术,提高激光输出功率。
在单个芯片上集成多个激光器,保证单个芯片上多个激光器同相同频输出。虽然分流到波导及光栅天线处的激光功率较低,但整个相控阵输出的激光功率将会提高,从而提高整个系统的探测距离。
现阶段OPA技术因耐受激光功率阈值低、扫描速度慢、角度覆盖范围有限等因素的制约,只能满足激光雷达领域在近距离探测、低帧率、小视场等应用,还无法满足在远距离探测、大角度成像等领域应用需求。本文概述了光学相控阵技术的基本原理,介绍了液晶相控阵、MEMS相控阵和光波导相控阵的技术发展,并对三种OPA性能进行对比,分析了光波导相控阵的劣势,以及为适应激光雷达的发展需求,分析了光波导相控阵的突破方向。
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  • 收稿日期:2024-05-13
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2种不同金属材料的力学参数

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total species (%)

Genus
种数
Number of
species
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Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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