朱旭愿 1,2,3剌晓波 1,2,3郭竟 1,2,3李振宇 1,2,3[ ... ]梁松 1,2,3,*
1 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
2 中国科学院大学材料与光电研究中心，北京 100049
3 低维半导体材料与器件北京市重点实验室，北京 100083
研制了以InGaAlAs多量子阱为有源材料的InP基1.3 μm波段高速直接调制分布反馈（DFB）激光器，单片集成了与DFB激光器区具有相同量子阱材料的分布式布拉格反射器（DBR）反馈区。室温下DFB有源区长度为200 μm时器件的3 dB小信号直接调制带宽大于29 GHz。在速率为25 Gbit/s的非归零（NRZ）码数据调制下，光信号经10 km长的单模光纤传输后获得10-10误码率的功率代价在室温及80 ℃下均小于1 dB。激光器的有源区长度较大，有利于提高发光效率并且有助于减小电流热效应的不利影响。所研制的高速直接调制激光器是大容量短距光纤通信系统的理想光源，具有广阔的应用前景。
激光器 半导体激光器 高速直接调制 InGaAlAs/InP 量子阱 1.3 μm波段 中国激光
2023, 50(10): 1001001
为了充分利用多目视觉系统的冗余信息,提高系统对同名物点世界坐标的解算精度,提出了一种基于加权Levenberg-Marquardt(LM)非线性优化的定位算法。该算法充分考虑拍摄距离对物点计算精度的影响,利用矩阵论中的广义正交投影法求解多相机约束下物点世界坐标初值,结合深度信息对目标函数进行加权,提高近距离相机的置信度,根据加权处理的LM算法对物点世界坐标进行迭代计算以获得最优解。在8 m×6 m×3 m的测量空间对4种算法进行了实验,实验结果表明,所提加权LM算法相比传统算法及近年提出的算法在精度与效率方面均有不同程度的提高,可为多目视觉系统的高精度定位提供一定的参考。
机器视觉 多目视觉系统 高精度定位 非线性优化 广义正交投影 加权LM算法 激光与光电子学进展
2021, 58(24): 2415006
强激光与粒子束
2021, 33(10): 103005
Author Affiliations
Abstract
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
The heterogeneous integration of silicon thin film and lithium niobate (LN) thin film combines both the advantages of the excellent electronics properties and mature micro-processing technology of Si and the excellent optical properties of LN, comprising a potentially promising material platform for photonic integrated circuits. Based on ion-implantation and wafer-bonding technologies, a 3 inch wafer-scale hybrid mono-crystalline Si/LN thin film was fabricated. A high-resolution transmission electron microscope was used to investigate the crystal-lattice arrangement of each layer and the interfaces. Only the H-atom-concentration distribution was investigated using secondary-ion mass spectroscopy. High-resolution X-ray-diffraction scanning was used to study the lattice properties of the Si/LN thin films. Raman measurements were performed to investigate the bulk Si and the Si thin films. Si strip-loaded straight waveguides were fabricated, and the optical propagation loss of a 5-μm-width waveguide was 6 dB/cm for the quasi-TE mode at 1550 nm. The characterization results provide useful information regarding this hybrid material.
Si thin film lithium niobate thin film hybrid material integrated optics Chinese Optics Letters
2021, 19(6): 060017
天津工业大学电子与信息工程学院, 天津 300387
为了解决煤矿井下带式输送机测温仪存在准确性和可靠性差等问题, 本文提出了一种带式输送机本质安全型红外测温仪设计方案, 采用 MLX90614红外传感器和 STM32F103C8T6处理器设计了其硬件；在 Keil 5.14开发平台上, 采用 C语言设计了其软件。并进行了实验, 结果表明该红外测温仪测温范围－20℃～380℃, 分辨率高, 测温准确, 温度测量精度为 ±0.5℃, 可实现非接触测量, 且不易损坏、可靠性高, 可广泛应用于煤炭、矿山、港口、电力、冶金、化工等领域。
带式输送机 红外 本质安全型 测温仪 MLX90614红外传感器 belt conveyor, infrared, intrinsically safe, therm
Author Affiliations
Abstract
1 National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, China
2 Quantum Science and Engineering Centre, Nanyang Technological University, Singapore 639798, Singapore
3 Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), Singapore 138634, Singapore
4 School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
5 e-mail: haoyl@pku.edu.cn
6 e-mail: yi_zhang@ntu.edu.sg
7 e-mail: eaqliu@ntu.edu.sg
We demonstrate a smart sensor for label-free multicomponent chemical analysis using a single label-free ring resonator to acquire the entire resonant spectrum of the mixture and a neural network model to predict the composition for multicomponent analysis. The smart sensor shows a high prediction accuracy with a low root-mean-squared error ranging only from 0.13 to 2.28 mg/mL. The predicted concentrations of each component in the testing dataset almost all fall within the 95% prediction bands. With its simple label-free detection strategy and high accuracy, the smart sensor promises great potential for multicomponent analysis applications in many fields.
Photonics Research
2021, 9(2): 02000B38
Author Affiliations
Abstract
1 Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Terahertz (THz) waves could be generated through exciting a gravity-guided, free-flowing water wedge by a dual-color pulse. It is not required to rotate the optimal angle considering the water film as an ionization medium. It is demonstrated to be more effective to generate stronger THz radiation when the ionization position is on the front surface of the air water interface of the water wedge by moving its position. The effect of pulse energy on THz generation is also investigated, and it is observed that with the increase of pulse energy the THz electric field shows a quadratic rising trend. These observations are consistent with air plasma induced THz emission.
water wedge THz plasma Chinese Optics Letters
2020, 18(7): 073201
1 国网山东省电力公司电力科学研究院国网电力系统人工智能联合实验室, 山东 济南 250001
2 山东鲁能智能技术有限公司, 山东 济南 250002
3 国网山东省电力公司, 山东 济南 250001
4 上海大学通信与信息工程学院, 上海 200444
为了满足无人机航拍对图像拼接实时性和稳健性的要求,提出了一种将改进的快速特征点提取和描述(ORB)算法与渐进一致采样(PROSAC)算法相结合的无人机航拍图像拼接算法。首先,利用加速稳健性特征(SURF)算法检测特征点,利用具有旋转特性的二进制稳健基元独立特征(rBRIEF)算法描述特征点,接着利用双向匹配算法和最近邻距离比率策略进行特征点的粗匹配,利用PROSAC算法剔除错误的匹配;然后利用全局单应性变换模型进行图像配准,最后利用渐入渐出图像融合方法进行图像的无缝融合拼接。实验结果表明:该算法在精度和速度上达到很高的平衡,能实现又快又好的图像拼接。
图像处理 图像拼接 特征点提取 特征点匹配 激光与光电子学进展
2019, 56(23): 231003
上海理工大学光电信息与计算机工程学院, 上海 200093
利用太赫兹时域光谱技术测量了氧化铝和氢氧化铝样品在0.5~1.5 THz范围内的太赫兹时域电场信号。对测量得到的时域信号进行了傅里叶变换,得到了样品信号与参考信号频域的振幅和相位信息。对比参考信号的频域谱发现,氢氧化铝在1.20 THz和1.33 THz处有明显的特征峰,而氧化铝与参考信号频域谱的特征峰相同。通过对石墨烯与氢氧化铝进行一定比例的掺杂,利用石墨烯表面等离激元的近场增强效应,增强了分子内羟基的共振伸缩,实现了对氢氧化铝特征峰的增强调控。这项研究不仅可以对氢氧化铝进行无损检测和有效识别,也可以利用石墨烯增加氢氧化铝的检测灵敏度,对进一步利用太赫兹时域光谱技术研究其他氢氧化物的光谱信息具有借鉴意义。
光谱学 太赫兹时域光谱 氧化铝 氢氧化铝 石墨烯 等离激元 激光与光电子学进展
2019, 56(12): 123001
