Applied Optics and Photonics China最新文献_第2页

Photonic synthesis based ultra-wide band signal generation 基于光子合成的超宽带信号生成技术

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008013

Yuqi Tan, Jiquan Zhai

引用次数: 0

High-power traveling wave photodetector with monolithically integrated bias circuitry network on a silicon photonics platform 硅光子学平台上单片集成偏置电路网络的大功率行波光电探测器

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005638

Zhu Wei, Zhilei Fu, Qiang Zhang, N. Ning, Qikai Huang, Yuehai Wang, Jianyi Yang, Hui Yu

引用次数: 0

Optical system design of seawater refractive index measurement based on ZEMAX 基于 ZEMAX 的海水折射率测量光学系统设计

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007963

Guanlong Zhou, Liyan Li, Yan Zhou, Xinyu Chen

{"title":"Optical system design of seawater refractive index measurement based on ZEMAX","authors":"Guanlong Zhou, Liyan Li, Yan Zhou, Xinyu Chen","doi":"10.1117/12.3007963","DOIUrl":"https://doi.org/10.1117/12.3007963","url":null,"abstract":"The refractive index is an intrinsic optical property of seawater and it is one of the essential parameters in ocean observation. The traditional method of detecting the refractive index of seawater is calculated by measuring the temperature, conductivity, and pressure of seawater using CTD (Conductivity-Temperature-Depth) device. However, CTD can only detect the conductive ions in seawater, but not the non-electrolytic solutes in seawater, which leads to errors in salinity detection, and the accuracy of current seawater refractive index detection methods cannot meet the requirements. In this paper, based on the requirements of seawater refractive index measurement, the Zemax optical simulation analysis of the seawater refractive index measurement system was carried out. The influence of the angle between the two pass lenses in the detection area, the focal length of the focusing lens, and the size of the photo sensitive surface of the detector on the measurement system are analyzed. When the angle between the two pass lenses is 30°, the focal length of the focusing lens is 300 mm and the size of the photosensitive surface of the detector is determined to 4×4 mm2, the optimal refractive index measurement sensitivity of the optical system is obtained. it is calculated that when the detector accuracy is 1μm, the refractive index detection sensitivity of the optical system is 10-6 RIU.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"24 1","pages":"129631L - 129631L-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the application of optoelectronic oscillators in airborne radar operational environment 光电振荡器在机载雷达运行环境中的应用研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008136

Shen Dong, Yuqi Tan, Ang Liu, Xingwei Ye, Junxiang Xiao, Yuhao Yang

{"title":"Research on the application of optoelectronic oscillators in airborne radar operational environment","authors":"Shen Dong, Yuqi Tan, Ang Liu, Xingwei Ye, Junxiang Xiao, Yuhao Yang","doi":"10.1117/12.3008136","DOIUrl":"https://doi.org/10.1117/12.3008136","url":null,"abstract":"The spectral purity of transmitted signal plays the key role in the application of modern airborne radar. Microwave photonic signal sources based on photoelectric oscillators (OEO) can directly generate high frequency local oscillator signal, and its phase noise level is significantly better than that of traditional microwave local oscillators. Currently, there are limited researches on the application of the photoelectric oscillator in the airborne practical environment, while the operational environment of the airborne radar is extremely harsh. This will hinder the practicality of the photoelectric oscillator in the airborne radar. In this paper, the key role of phase noise in airborne radar scene detection is analyzed first. The influence of different signal forms on the phase noise of the transmitted excitation signal in radar is calculated, and the principle of reducing phase noise to improve the detection performance of airborne radar is summarized. Based on the design framework of the optical oscillator, the phase noise level of the optical oscillator in the airborne vibration environment is analytically analyzed and numerically simulated. The physical model and empirical formula of the influence of the phase noise of the optical oscillator in vibrational environment are established. Finally, the validity of the theory of phase noise deterioration in the vibrational environment is verified by the vibration-test-platform experiment. Combined with the test results, some suggestions for improving the design of the photoelectric oscillator for airborne radar in the actual combat environment are summarized. This work lays a good foundation for the application of photoelectric oscillator in airborne radar.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"124 1","pages":"129662C - 129662C-7"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature monitoring of computer room based on ROTDR distributed fiber sensing principle 基于 ROTDR 分布式光纤传感原理的机房温度监控系统

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007531

Yu Wang, Yong Sun, Shanshan Li, Wenlin Han, He You

引用次数: 0

Low-cost fixed-angle ground-based lidar integration with point cloud registration 低成本固定角度地基激光雷达与点云注册的集成

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3003987

Ying Zhang, M. Guo, Guoli Wang, Yuquan Zhou, Kecai Guo, Xingyu Tang

{"title":"Low-cost fixed-angle ground-based lidar integration with point cloud registration","authors":"Ying Zhang, M. Guo, Guoli Wang, Yuquan Zhou, Kecai Guo, Xingyu Tang","doi":"10.1117/12.3003987","DOIUrl":"https://doi.org/10.1117/12.3003987","url":null,"abstract":"Aiming at the problems of high cost and large size of the traditional mechanical lidar scanning point cloud, a point cloud data acquisition hardware system and a single-site cloud registration procedure were developed by using the prismatic lidar with low cost, small size and petal-shaped point cloud. Since the density of the point cloud collected by this lidar is time-dependent, in order to obtain a high-density point cloud, each station adopts a data collection method in which the motor-controlled lidar rotates 22.5 degrees each time, rotates 16 times, and scans the environment for one week. Using the self-developed station data processing programme, the data from each station were aligned according to the angle of the data by rotating the data through the space vector rotation algorithm. In the stage of inter-station point cloud registration, the original feature constraints of the multi-site cloud are obtained, and the error equations are derived from the constraints through the initial solution of all the station transformation parameters and unknown points except the control points. The weight function established by each constraint error is used as the constraint for iterative settlement until the iteration conditions are met, and all site space transformation parameters and location coordinates are output to achieve overall registration of multi-site cloud. This experiment shows that the point cloud data collected by the self-developed low-cost lidar has high density, high resolution, and the accuracy after registration is about 2cmin the nominal accuracy of prism lidar hardware, which has strong practicability and feasibility.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"36 1","pages":"129590E - 129590E-12"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature-insensitive polarization mode converter based on thin-film periodically-poled lithium niobate 基于薄膜周期性极化铌酸锂的温度敏感型极化模式转换器

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3006111

Ting Hao, Rongjin Zhuang, Jinlong Lu, Zhihao Li, Dennis Zhou, Guijun Ji, Xinglong Wang

引用次数: 0

Research on the blind source separation method of DAS signal based on the improvement of FastICA algorithm 基于 FastICA 算法改进的 DAS 信号盲源分离方法研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008484

Tianxiong Li, Fudong Zhang, Jun Lin, Xingye Bai, Haozhuang Liu

引用次数: 0

Effects of carrier leakage problem on coherent communications 载波泄漏问题对相干通信的影响

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007587

Quan Cao, Sheng Yu, Shi-Chao Zhu

引用次数: 0

Study on green picosecond laser machining quality of carbon fiber reinforced polymers 碳纤维增强聚合物的绿色皮秒激光加工质量研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007390

Yue Zhao, Honglu Bian, Wenchao Wang, Zhipeng Ning, Ming Gao, Xunxia Lu, Jiaxiu Wang, Xu Chen, Guoli Peng, Kaihu Zhang

{"title":"Study on green picosecond laser machining quality of carbon fiber reinforced polymers","authors":"Yue Zhao, Honglu Bian, Wenchao Wang, Zhipeng Ning, Ming Gao, Xunxia Lu, Jiaxiu Wang, Xu Chen, Guoli Peng, Kaihu Zhang","doi":"10.1117/12.3007390","DOIUrl":"https://doi.org/10.1117/12.3007390","url":null,"abstract":"This paper uses an ultrafast laser with a wavelength of 532nm and a pulse width of 10ps to conduct cutting process experiments on typical grades of CFRP materials in the aerospace manufacturing field, such as high-modulus CFRP and high-strength CFRP. After optimizing laser parameters and processing paths, a high-quality processing effect with minimal heat affected zone was obtained, and the fracture morphology characteristics and mechanical properties of the processed specimens were studied. The results indicate that under the laser wavelength, pulse width, and processing parameters selected in this paper, the morphology of the cut edge of typical CFRP materials was observed without visible heat affected zone through 200x optical microscope magnification, and the processed section was bright and burr-free, the fiber bundle section was neat, and the resin section was smooth through 2000x scanning electron microscope observation. Through the mechanical tensile testing, compared the ultrafast laser processed tensile specimens with the traditional mechanical cutting and punching tensile specimens, the ultrafast laser processed specimens of many typical grades of CFRP materials all have higher tensile mechanical properties, which also proves that the ultrafast laser pulse width and wave band used for CFRP materials have excellent processing quality, and are suitable for promotion and application in the aerospace manufacturing field. Finally, this paper introduces the typical applications of ultrafast laser processing CFRP in aerospace products.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"489 ","pages":"129590Q - 129590Q-7"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0