留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

2019年  12卷  第2期

原创文章
[Cd(对硝基苯甲酸)2(乙二胺)H2O]配合物的结构及荧光性能
祝波, 高永为, 刘芷晨, 罗亚楠
2019, 12(2): 302-309. doi: 10.3788/CO.20191202.0302
摘要:
以氯化镉、对硝基苯甲酸和乙二胺(en)为原料,成功合成了具有荧光性能的[Cd(对硝基苯甲酸)2(乙二胺)H2O]配合物 1 ,并对其结构进行解析。首先,采用水热合成法进行配合物 1 的合成。接着,利用单晶X射线衍射测定配合物 1 的结构。然后,采用元素分析法、红外光谱法(IR)、热重分析法(TGA)和粉末X射线衍射法(PXRD)对其进行表征。最后,在室温条件下,对配合物 1 进行荧光性能测试。实验结果表明:配合物 1 通过N-H…O、O-H…O和C-H…O氢键将离散结构连接形成三维超分子构型。配合物 1 在266 nm处激发,在377 nm和444 nm处出现两个发射峰,表现出较强的荧光性能。上述结果说明,配合物 1 的荧光性能主要来自于配体到配体的跃迁,可以作为具有发展潜能的荧光光学材料。
铝合金表面激光沉积AlCrFeCoNiCu涂层的组织及耐蚀性能
李彦洲, 石岩
2019, 12(2): 344-354. doi: 10.3788/CO.20191202.0344
摘要:
为了提高铝合金表面的力学和耐腐蚀性能,利用激光沉积技术在铝合金表面制备了AlCrFeCoNiCu高熵合金涂层。使用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱分析仪(EDS)、显微硬度计和电化学工作站,研究了涂层的相结构、微观组织、元素分布、硬度及耐腐蚀性能。结果表明,涂层与基材结合良好,基材中Al元素在熔池搅拌作用下上浮,使沉积层呈FCC相和BCC相;显微组织为典型的枝晶结构,Cu元素在枝晶间富集;涂层平均显微硬度为528HV0.2,约是基材的5倍;AlCrFeCoNiCu涂层在3.5% NaCl溶液中的腐蚀特征为点蚀和晶间腐蚀,耐腐蚀性优于基材。激光沉积制备的AlCrFeCoNiCu高熵合金可以改善铝合金表面性能。
基于点光源和球面光源的集鱼灯照度模型比较研究
花传祥, 李非, 朱清澄, 孙栋, 田中旭
2019, 12(2): 274-288. doi: 10.3788/CO.20191202.0274
摘要:
集鱼灯是秋刀鱼等光诱渔业中重要的助渔装备,本文以秋刀鱼集鱼灯为例,分别基于点光源法和球面光源法建立了单灯箱理论照度模型。比较平面照度的理论值和实测值发现,基于球面光源法计算的理论值和实测值间线性拟合斜率系数较点光源法更接近于1。基于球面光源法计算的理论值与实测值间无显著差异(P>0.05),而由点光源法计算的理论值与实测值间存在显著性差异(P < 0.05),说明基于球面光源法建立的照度模型更加符合实际情况。根据球面光源模型分别计算了白、红单灯箱在45°、60°、75°倾角下的照度分布,结果发现照度值均随距离增加呈先增大后减小趋势;同倾角不同灯色间照度分布差别较大,相同位置处白灯箱照度明显高于红灯箱;同灯色不同倾角间照度分布差别较小;随倾角增加,最大照度值位置到原点距离逐渐减小;照度衰减速率的绝对值随距离增加呈现先减小后增大再减小的趋势,最终趋近于0。
Weak microcavity effect in tandem white organic light-emitting diodes employing an effective charge-generation layer of Liq/Al/HAT-CN
YU Ye, LIN Wen-yan, PENG Xue-kang, JIN Yu, WU Zhi-jun, CHEN Yan
2019, 12(2): 382-394. doi: 10.3788/CO.20191202.0382
摘要:
A charge generation layer(CGL) of Liq/Al/HAT-CN is used to fabricate the blue-yellow complementary tandem white organic light-emitting device. A group of dual-color devices are used to illustrate the working mechanism of CGL, and Liq/Al structure in the CGL is further studied. Under the current density of 10 mA/cm2, the operating voltage(8.3 V) and luminance(746 cd/m2) of the tandem device are both approximately the sum of those of blue device(4.2 V, 315 cd/m2) and yellow device(4.2 V, 426 cd/m2), respectively, confirming that the charge generating layer is effective. The maximum brightness of 11 420 cd/m2 is obtained at the current density of 240 mA/cm2, and the current efficiency and power efficiency are 7.2 cd/A and 2.6 lm/W under the luminance of 1 000 cd/m2, respectively. When driving current density increases from 10 mA/cm2 to 30 mA/cm2, the ratio of blue light in spectra increases by 5%, which means the stable performance of device. In view of the weak microcavity effect existing in the tandem device, we conducted in-depth research by optical simulation based on the microcavity theory. The simulation results are highly consistent with the actual spectra, demonstrating the accuracy of optical simulation calculation.
Internal profile reconstruction of microstructures based on near-infrared light transmission reflection interferometry with optical path compensation
SHI Jian-hua, HAN Bing-chen
2019, 12(2): 395-404. doi: 10.3788/CO.20191202.0395
摘要:
The bottom and sidewall profile reconstruction of microstructures with a high aspect ratio is a problem that urgently needs to be solved in the field of MEMS(Micro-Electro-Mechanical system). Microstructures profile reconstruction method is presented based on near-infrared light transmission reflection interferometry with optical path compensation(OPC), which is extended from white light to near-infrared light and from reflection interference to transmission interference. The near-infrared light transmission interferometry system is composed of a near-infrared light source, an interference microscope, an infrared light CCD, piezoelectric ceramics with high accuracy and a data acquisition system. A GaAs sample microstructure with two steps was designed and the method of vertical scanning interference of near-infrared light with OPC was adopted to reconstruct the internal profile of a microstructure, which was then compared with the results of scanning electron microscopy(SEM). Test results show that the relative heights of the measured microstructure steps using near-infrared light transmission reflection interferometry were 2.132 μm and 0.766 μm with 2.16% and 2.68% relative errors, respectively, which agree with the results of SEM and that of the near-infrared light reflection interferometer. The measurement system has the ability to reconstruct the bottom and sidewall profile of microstructures with a high aspect ratio.
半主动激光制导能量传输与模拟技术
刘克俭, 苗锡奎, 徐晨阳, 王烨, 张军强, 杨斌, 孙婷婷
2019, 12(2): 256-264. doi: 10.3788/CO.20191202.0256
摘要:
为模拟实战环境下半主动激光制导的目标回波能量,设计并研制了注入式激光能量模拟设备。对激光制导能量传递过程及模拟技术进行研究。首先,针对激光制导武器工作过程,建立了激光在大气中传输发生散射与衰减的模型,并针对实战中存在的各种烟雾、降雨、干扰烟剂等进行建模仿真。接着,设计了激光目标回波能量模拟器的总体方案,选用DPS-A激光器和布儒斯特角薄膜偏振器模拟激光衰减过程。设计了光纤耦合与匀光准直系统。最后,构建了激光制导半物理仿真系统,分别进行了激光回波能量模拟实验、激光导引头标定与激光末制导试验。实验结果表明:激光能量模拟误差小于3.0%,导引头线性角度范围内残差小于0.08°,测角精度小于0.45 mrad,末制导过程体视线角跟踪误差小于0.2°。该系统可模拟多种实战环境中激光能量传输情况,且精度高,能够满足激光制导半物理仿真要求。
树基沟矿区铜胁迫落叶松的光谱响应特征研究
杨丽丽, 赵摇, 姚玉增
2019, 12(2): 332-343. doi: 10.3788/CO.20191202.0332
摘要:
为了研究长白落叶松光谱对土壤Cu胁迫的响应特征和变化规律,在辽东树基沟矿区的3条勘测线上布置采样点,进行表层土壤的多种重金属元素含量和长白落叶松针叶的反射光谱测定,并提取了7个特征波段,计算了多个波段区间的光谱角,将其与土壤主要重金属铜的含量进行相关分析,建立了回归模型。结果表明:7个光谱特征波段中,"红谷"参数与表层土壤铜含量的相关系数最大,基于"红谷"反射率建立的回归模型的R2达到0.865。光谱角对铜胁迫长白落叶松针叶波段区间[400,716]nm、[400,2 500]nm的光谱变化十分敏感。"红边"位置和反射率与土壤铜含量不相关,不适合区分矿区表层土壤重金属含量间的细微差别。对可见光敏感的"红谷"参数和光谱角均表明反射光谱的差异主要由叶绿素含量控制,小部分受到针叶中水分含量的影响。本研究利用长白落叶松"红谷"和光谱角的"指纹效应",为快速有效反演大面积高植被覆盖区的土壤重金属含量、圈定隐伏矿(化)体提供了理论依据。
Compact quasi continuous pumped Nd: YAG Q-switched solid laser
LIU Yu-qian, ZHANG He, JIN Liang, XU Ying-tian, WANG Hai-zhu, ZOU Yong-gang, MA Xiao-hui, LI Yan
2019, 12(2): 413-424. doi: 10.3788/CO.20191202.0413
摘要:
A compact end-pumped Electro-optical Q-switched Nd:YAG laser was designed in this paper. In order to achieve compact construction, laser diode arrays(LDAs) with collimated fast axes were used as pumping source. A spherical lens with a focal length of 40 mm and a cylinder lens with focal length of 25 mm were used as a group for the coupling lens. The LDAs' beam profiles on the incident and exit faces were calculated using Tracepro software. The simulation results indicate that when taking a Φ 6 mm×30 mm Nd:YAG with a doping concentration of 1.0at.% as the gain medium, the spots on the incident and exit faces were 5 mm(slow-axis)×4.5 mm(fast-axis) and 3 mm(slow-axis)×6 mm(fast-axis), respectively, and the absorption pumping power was about 83%. Dynamic temperature field distributions of Nd:YAG larer in 360 s at 22℃ and 60℃ were simulated by Ansys software. Output pulsed energy of 30 mJ and 25 mJ were achieved while the repetition frequencies were 30 Hz and 50 Hz, corresponding to a slope efficiency of 11.6% and 14.71%. The pulse durations were 18 ns and 16 ns, respectively. The experimental results show that the designed compact laser in this paper can achieve stable pulse laser output.
电子束硅片图形检测系统中的纳米级对焦控制技术
郭杰, 李世光, 赵焱, 宗明成
2019, 12(2): 242-255. doi: 10.3788/CO.20191202.0242
摘要:
带电粒子束成像检测技术是一种可以提供纳米级测量精度的技术,广泛应用于半导体检测中。在进行硅片检测时,要求待测硅片在扫描检测过程中一直处于电子束的焦深范围(DoF)内。本文提出一种毫米级控制范围、纳米级控制精度、高度测量时间在亚毫秒量级的粗精结合的闭环硅片高度控制技术。它的核心子系统是一套光学硅片高度测量系统,在进行粗控制时,数字相机的成像面作为一个光栅图像接收面,硅片的高度信息通过测量光栅线条在成像面上的位移获得。在接近目标高度时,数字相机的成像面作为一个虚拟的数字光栅使用。它与光学光栅图像存在一定周期差,两者构成类似机械游标卡尺的结构,本文称为光学游标卡尺,实验表明该技术可以在成像面上细分像素尺寸10×以上。当用其测量硅片高度时,粗测范围达毫米量级,粗测时间小于0.38 ms,精测分辨率小于80 nm,精测时间小于0.09 ms。利用该硅片高度测量系统进行硅片高度的初步闭环反馈控制,控制精度达到15 nm,在电子束硅片图形检测系统中具有广阔的应用前景。
自适应上下文感知相关滤波跟踪
刘波, 许廷发, 李相民, 史国凯, 黄博
2019, 12(2): 265-273. doi: 10.3788/CO.20191202.0265
摘要:
针对上下文感知相关滤波目标跟踪算法中,上下文背景样本等值权重训练,对背景信息滤波过于平滑的问题,提出了一种自适应上下文感知相关滤波算法,同时为了解决目标遮挡的问题,引入一种新的遮挡判定指标。首先,提取目标上下左右4个方向的背景样本学习到滤波器中,利用卡尔曼滤波对目标运动状态进行估计,预测目标的运动方向。在滤波器训练时,对目标运动方向上的背景样本训练时赋予较多的权重;接着,在模型更新时引入一个新的遮挡判定指标APCE,只有当响应峰值和APCE数值分别一定比例大于各自的历史均值时,才对目标模型进行更新;最后将本文算法与当前一些主流的跟踪算法在CVPR 2013 Benchmark进行对比实验。仿真实验结果表明,本文算法的精准率和成功率分别为0.810和0.701,均优于其他算法,充分体现出了本文提出算法的鲁棒性。
基于光电探测的多光谱测温装置
张磊, 陈绍武, 赵海川, 王平, 武俊杰
2019, 12(2): 289-293. doi: 10.3788/CO.20191202.0289
摘要:
为了实现非接触式高温测量,本文基于多光谱辐射测温理论,采用多路光电探测器,设计了多光谱快响应测温系统。对测量装置的测量原理、系统结构、系统标定等进行了阐述和分析。接着利用标准钨灯对装置进行了光谱响应系数标定,并通过标准辐射源进行了温度测量的实验验证,验证了测量装置用于高温测量的准确性。
基于区域滤波的模糊星图复原方法
王军, 何昕, 魏仲慧, 穆治亚, 吕游, 何家维
2019, 12(2): 321-331. doi: 10.3788/CO.20191202.0321
摘要:
当星敏感器在动态条件下工作时,在成像的过程中星点会因能量的分散而出现运动模糊现象,导致图像的信噪比降低,星点的模糊区域很难被提取,从而降低了星点质心的定位精度,严重影响星敏感器的姿态测量精度。为此,文中提出了一种基于区域滤波的模糊星图复原方法,在有效提高图像信噪比的同时可提高星点质心的定位精度。首先,根据星敏感器的工作特性,建立了不同工作条件下星点质心的运动模型。然后,根据运动模型确定星点质心的运动轨迹,进而提取星点的模糊区域,再利用图像处理算法对模糊区域内外的图像分别进行预处理。最后,利用图像复原算法对模糊星图进行复原。实验结果表明:在2(°)/s的动态条件下,区域滤波算法能够有效提高模糊星图的信噪比,并且复原图像中星点质心的定位误差不超过0.1 pixel,可以满足星敏感器对高质心定位精度的要求。
用于太阳光谱仪的光电探测系统线性度测试装置
孙德贝, 李志刚, 李福田
2019, 12(2): 294-301. doi: 10.3788/CO.20191202.0294
摘要:
依据光叠加原理研制了一台太阳光谱仪光电探测系统线性度测试装置。该测试装置由300 W高稳定度氙灯光源、250 W卤钨灯光源、双层中性滤光片轮、双孔光阑及光学成像系统组成。依靠中性滤光片改变光束强度,依靠独立开闭的双光阑和光学成像系统实现光流叠加。该装置工作波段为200~2 400 nm,可模拟紫外-可见-红外波段地外太阳光谱辐照度,动态范围为104,已用于太阳光谱仪等光谱仪和硅光电二极管标准探测器等光电探测系统线性测量。
Femtosecond pulsed laser induced damage characteristics on Si-based multi-layer film
ZHENG Chang-bin, SHAO Jun-feng, LI Xue-lei, WANG Hua-long, WANG Chun-rui, CHEN Fei, WANG Ting-feng, GUO Jin
2019, 12(2): 371-381. doi: 10.3788/CO.20191202.0371
摘要:
In order to understand the ultrafast laser-induced damage mechanisms of typical imaging sensor's film structures, the damage characteristics of Si-based multi-layer films irradiated by a femtosecond pulsed laser were investigated, and the laser pulse fluence ranges and threshold conditions corresponding to various damage phenomena were evaluated. Si-based multi-layer films that were similar in structure of CCD were prepared by electron beam deposition. The damage characteristics of these films irradiated by a femtosecond pulsed laser with wavelength of 800 nm and pulse width of 100 fs under different pulse fluences and numbers were investigated using a metallurgical microscope. Experimental results showed that the laser-affected zone size increased linearly with pulse fluence in the range of 1.01 to 24.7 J/cm2. Surface damage caused by oxidation/amorphization, non-thermal ablation, and laser-induced plasma ablation could be observed in the laser irradiated zone, which tightly depended on the pulse fluence. Multi-layer damage could be observed and the damage probability increased from 1% to 51% in the pulse fluence range from 2.42 to 24.7 J/cm2. Irradiated by sequent pulses at a fluence of 1.01 J/cm2, the laser affected zone remained almost unchanged and the ablated depth increased with the pulse number. From the single pulse damage experiment data, the femtosecond pulse laser-induced surface damage threshold was evaluated to be 0.543 J/cm2 and laser-induced multi-layer stress damage threshold was linearly fitted to be 2.16 J/cm2. Sequent pulse irradiation with low fluence(≤ 1.01 J/cm2) also could lead to deep damage on the multi-layer film.
声光偏转快调谐脉冲CO2激光器实验研究
潘其坤, 俞航航, 陈飞, 谢冀江, 何洋, 于德洋, 张阔
2019, 12(2): 355-361. doi: 10.3788/CO.20191202.0355
摘要:
采用双声光调制器光路快速偏转技术与自准直光栅法实现CO2激光全波段快调谐同光路输出。首先对声光调制器特性进行实验研究,结果显示:声光调制器偏转角度约为4.4°,与运用布拉格方程计算结果相符;且激光单次通过声光调制器移频量为40.68 MHz,与声光驱动器射频频率一致,将激光往返多次经声光调制器的移频量叠加。进而,开展基于声光调制器的CO2激光快调谐实验研究,运用两个对称布置的同驱动频率声光调制器补偿声光移频,实现偏转光路振荡输出,运用光栅法在直线光路中实现激光全波段可调谐输出。最终,在声光调制器时序控制下,实现双波长激光快调谐同光路输出,选定激光波长的切换时间约为1 ms,脉宽小于300 ns,且双波长切换速度不受CO2激光跃迁谱带的限制。
多元热流体激光检测及杂光抑制光路
吕妍, 王迪, 王志国, 王明吉, 李栋
2019, 12(2): 310-320. doi: 10.3788/CO.20191202.0310
摘要:
为实现多元热流体组分含量激光在线检测,根据多次反射吸收光谱原理提出了长光程开放光路反射阵列光学池,研究了不同光斑直径下光束发散角和对准误差对多元热流体检测系统接收效率的影响,并且针对高温注汽管道内壁产生的杂散辐射提出一种新型消杂光结构。研究结果表明:反射镜镀膜为银膜,光学窗口材料为熔融石英,多次反射结构的最佳反射次数为40次,有效吸收光程为220 cm;对于不同光斑直径的检测光束,发散角与对准误差的增大对系统接收效率的衰减趋势和衰减幅度基本一致;离轴角为5°时,系统点源透射比(PST)为1.21×10-7。最后通过高温管道内壁热辐射抑制实验验证了杂光抑制结构的有效性。
Photorefractive phenomenon of biphenyl derivatives
WANG Chun, QI Hui, CHANG Hai-tao, DENG Jia-chun
2019, 12(2): 362-370. doi: 10.3788/CO.20191202.0362
摘要:
The photorefractive phenomenon was observed in biphenyl derivatives materials under continuous wave laser(532nm) irradiation. Two types of sample were prepared:biphenyl derivatives(2-(4-hydroxypheny)-5-pyrimidinol, 4'-hydroxy-4-biphenyl carbonitrile, 3-amino-4-phenylphenol and 4, 4'-Biphenol) were respectively dissolved in N, N-dimethylformamide(DMF) detaining 4-solution samples, and the concentration was 2wt%; biphenyl derivatives were dissolved into a saturated solution of anhydrous ethanol as a solute, and the single crystals of biphenyl derivatives were obtained by slow evaporation of the ethanol solution at an ambient temperature. The experimental results show that cyclic symmetric bright-dark spatial stripes were formed after the laser beam transmitted through the 2-(4-hydroxypheny)-5-pyrimidinol, 4'-hydroxy-4-biphenyl carbonitrile and 3-amino-4-phenylphenol solutions with an asymmetric chromophore. On the other hand, the transmitted laser spot has no change in 4, 4'-Biphenol solution, no matter how the laser power density was increased. A distorted beam was observed when the 2-(4-hydroxypheny)-5-pyrimidinol, 4'-hydroxy-4-biphenyl carbonitrile, and 3-amino-4-phenylphenol single crystals were irradiated by high optical power density, while the laser beam spot experienced no change in the 4, 4'-Biphenol single crystal. The different values of the Open/Dark current were about 10 nA in biphenyl derivatives with an asymmetric chromophore. The distorted optical spot stretched along the laser polarization. The threshold value of laser power density for distorted spot was about 100 W/cm2 and 10 W/cm2 in the solutions and single crystals of biphenyl derivatives with an asymmetric chromophore. An explanation was proposed for the symmetric cyclic bright-dark spatial stripes, being that they were induced by the photorefractive effect. The photorefractive effect relies on the formation of a space-charge field through the illumination of inhomogeneous light intensity patterns. The biphenyl derivatives were found to be photorefractive materials.
Link performance evaluation for air-sea free-space optical communications
LI Jun, YUAN Xiu-hua, WANG Ming-hao
2019, 12(2): 405-412. doi: 10.3788/CO.20191202.0405
摘要:
Effective communication between underwater platforms and aerial platforms has been a challenging issue in a long-time, due to the fact that either acoustic waves or electromagnetic waves can efficiently transmit only in the sea water or air, rather than both. As laser beams are able to penetrate a decent depth of sea water, free-space optical communications(FSOC) is considered to be a good substitutive approach. As is well known, the attenuation caused by absorption and scattering has proved to be the most significant adverse factor for underwater laser propagation, which, however, can only be compensated by a larger power margin. Nonetheless, even if the launching power is large enough to allow for affordable receiver sensitivity, the intensity fluctuation induced by atmospheric and oceanic turbulence can degrade the link performance to a great extent. This study addresses the turbulence effects on FSOC links between an underwater vehicle and an aerial platform. By use of wave optics simulation(WOS), the propagation of both the Gaussian beams and the annular beams in an air-sea two-section link is examined. The difference in performance between the uplink and the downlink is compared and explained according to numerical results. Generally, uplink suffers more from turbulence because the majority of turbulence lies nearer to its transmitter. Moreover, it is found that an annular beam always delivers a smaller scintillation index and a greater signal-to-noise ratio. This study is supposed to benefit the research and development of future air-sea optical communication systems.
综述
Kramers-Kronig关系的研究与发展
阎春生
2019, 12(2): 179-198. doi: 10.3788/CO.20191202.0179
摘要:
Kramers-Kronig关系(简称KK关系)是希尔伯特变换的一个特例,描述了具有因果性的平方可积函数实部与虚部之间的数学联系,具有普适的物理背景。本文介绍了KK关系的历史及数学物理本质,详细阐述了其在电学、磁学、声学、光学、人工介质以及光通信中的具体形式、涵义及应用,包括反射和透射响应函数、电极化率、介电常数、折射率、电导率、电阻抗、磁导率、原子散射因子、绝热压缩系数、声折射率、单边带时域信号、空间隐身介质还有各种非线性介质等。分析了截断误差在实际应用中对KK积分计算结果的影响,总结了各种积分限外推方法以及各种基于锚点的减法KK关系,包括单减KK关系、多减KK关系及差分多减KK关系等。
超快激光制备生物医用材料表面功能微结构的现状及研究进展
张佳茹, 管迎春
2019, 12(2): 199-213. doi: 10.3788/CO.20191202.0199
摘要:
提高医疗植入材料的生物相容性,对提升植入医疗器械的安全性有重要意义。通过超快激光制造出微纳米级别尺寸的材料结构以改善材料的生物相容性,近年来已被广泛应用于生物医学领域。本文简单介绍了细胞与生物材料相互作用原理,从生物材料表面微结构对其生物相容性能的影响出发,综述了超快激光加工不同材料表面形貌特征对细胞粘附、迁移、增殖、分化的影响,并进一步指出超快激光制备微纳结构在生物材料领域的局限和发展趋势。
大型复杂曲面三维形貌测量及应用研究进展
马国庆, 刘丽, 于正林, 曹国华
2019, 12(2): 214-228. doi: 10.3788/CO.20191202.0214
摘要:
大型复杂曲面因为空间尺度大、结构复杂,因此对其进行测量和检测相对较困难,三维形貌测量技术分辨率高、数据获取速度快,为大型复杂曲面的偏差控制和逆向工程提供了技术保障。分析和综述了大型复杂曲面三维形貌测量及应用研究的进展,论述了目前实现大型复杂曲面三维形貌测量的手段,归纳和总结了目前以及未来几年可用大型复杂曲面三维形貌测量的设备和仪器的特点与应用场合,并对比分析了每种测量设备的优缺点,为正确和广泛应用三维形貌测量设备提供参考,重点介绍了三维点云获取方法及点云处理方法,对点云预处理方法、点云拼接方法所涉及的技术进行归纳总结。最后,对三维形貌测量技术的应用场合进行剖析,认为大型复杂曲面三维形貌测量将向着非接触、自动化方向发展,在发展过程中基于全局坐标的点云拼接、非贴点测量将成为研究的主要方向。
硅光子芯片外腔窄线宽半导体激光器
杜悦宁, 陈超, 秦莉, 张星, 陈泳屹, 宁永强
2019, 12(2): 229-241. doi: 10.3788/CO.20191202.0229
摘要:
随着超高速光互连、相干光通信、相干检测等技术的不断发展,对激光光源的线宽、相频噪声、可调谐性和稳定性等都提出了更为严格的要求。利用基于CMOS(Complementary Metal Oxide Semiconductor)工艺的硅光子芯片与半导体增益芯片各自的优势,将二者准单片集成实现结构紧凑、低功耗和高稳定性的窄线宽半导体激光器成为近年的研究热点。该结构可通过微环谐振器、环形反射镜和马赫曾德干涉仪等提供光反馈压窄线宽,并实现宽调谐范围和稳定功率输出。本文主要阐述了硅光子芯片外腔半导体激光器的最新研究进展,针对几种包含微环谐振器的结构进行了分类介绍,深入讨论了增加耦合效率和降低端面反射率等技术难题。针对未来空间光通信和光互连等应用前景,展望了该类激光器在功率提升和光子集成方面的未来发展方向。