SPIE/COS Photonics Asia最新文献_第8页

A method of metasurface collimating pulsed laser diode for lidar emission system 一种用于激光雷达发射系统的元面准直脉冲激光二极管的方法

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687862

Zewu Liu, Lei Yang, Chengxiang Guo, Hongbo Xie

{"title":"A method of metasurface collimating pulsed laser diode for lidar emission system","authors":"Zewu Liu, Lei Yang, Chengxiang Guo, Hongbo Xie","doi":"10.1117/12.2687862","DOIUrl":"https://doi.org/10.1117/12.2687862","url":null,"abstract":"Metasurfaces can overcome the shortcomings of traditional lenses, such as large volume, heavy weight and difficult aberration correction. However, based on the diffraction principle, metasurfaces have serious chromatic aberration and lower efficiency than traditional glass lenses, so they need to be used with monochromatic laser illumination. Therefore, metasurfaces are the best choice for lidar systems to realize miniaturization and lightweight design. The lidar emitting system usually uses a 905nm pulsed laser diode (PLD) as the light source, which requires two cylindrical lenses to collimate the laser beam in the X and Y directions separately. In this paper, two metasurfaces is designed in different areas of the same substrate to collimate the laser beam. By folding the light path through the right-angle prism, the beam passes through two metasurfaces successively, which are responsible for collimating the rays in the X and Y directions respectively. After collimation, the divergence angles of the rays are less than 0.3°×0.1°. By attaching a microelectro-mechanical system (MEMS) mirror behind the metasurfaces to realize scanning, we can obtain the lidar emitting system. By using metasurfaces to replace the traditional cylindrical lenses, the weight and size of the lidar emitting system can be greatly reduced. With further research on metasurface technology, metasurfaces are expected to replace the traditional lenses and even the scanning device in lidar, so as to realize highly integrated chip-level lidar.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"1 1","pages":"127650P - 127650P-10"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139216651","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

Low threshold Brillouin lasing with hybrid modes of coupled silica microtoroids 利用耦合硅微透镜的混合模式实现低阈值布里渊激光

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686831

Yong Hu, Shaoliang Yu, Qingyang Du, Xiaoshun Jiang

{"title":"Low threshold Brillouin lasing with hybrid modes of coupled silica microtoroids","authors":"Yong Hu, Shaoliang Yu, Qingyang Du, Xiaoshun Jiang","doi":"10.1117/12.2686831","DOIUrl":"https://doi.org/10.1117/12.2686831","url":null,"abstract":"We experimentally demonstrated a stimulated Brillouin laser with hybrid modes, utilizing two coupled silica microtoroid cavities. The first cavity consists of paired modes with a frequency difference close, but not exactly equal, to its Brillouin frequency shift. The second cavity has a resonant mode that is close to one of the modes of the first cavity. The strong coupling between the two similar frequency modes induces mode splitting, resulting in the generation of a hybrid paired mode. This hybrid mode comprises one eigenmode from the first cavity and the super-modes of the coupled microtoroids. By finely tuning the coupling strength to match the frequency difference between the paired modes and the Brillouin shift, we achieve Brillouin lasing. Furthermore, the offset of the frequency shifting in the hybrid modes configuration is much smaller than the Brillouin frequency shift, significantly reducing coupling loss and enabling the realization of a lowthreshold Brillouin laser. We experimentally observed a lasing threshold as low as 0.45 mW, which is two orders of magnitude lower than that of the direct super-modes frequency matching method. This novel approach relaxes the strict requirement of exact frequency matching conditions for Brillouin lasing, making it an excellent platform for compact and ultra-low threshold Brillouin lasers.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"26 1","pages":"127730P - 127730P-3"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139217640","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

High-power and narrow-linewidth semiconductor laser with silicon nitride microring 带氮化硅微孔的高功率窄线宽半导体激光器

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2688993

Xin Zhang, Yilu Wu, Qingsong Bai, Yuqi Hu, Wei Xiong, Zhengmao Wu, Dan Lu, Jiagui Wu, Guangqiong Xia

引用次数: 0

Analysis and design of optical system for the defocused light field cameras 散焦光场照相机光学系统的分析与设计

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2689079

Weiqi Lu, Jiacheng Zhu, Weimin Shen

引用次数: 0

Design of a high phase-shift efficiency wide-tuning silicon nitride filter 设计高移相效率宽调谐氮化硅滤波器

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2685992

Qichao Wang, Qiang Zhang, Xinyan Ma, Kun Yin, Hui Yu

{"title":"Design of a high phase-shift efficiency wide-tuning silicon nitride filter","authors":"Qichao Wang, Qiang Zhang, Xinyan Ma, Kun Yin, Hui Yu","doi":"10.1117/12.2685992","DOIUrl":"https://doi.org/10.1117/12.2685992","url":null,"abstract":"Silicon nitride photonic integrated circuits with ultra-low loss are widely used in applications such as telecommunications and optical sensing. However, the radiation loss increases rapidly as the radius is reduced, resulting in large-sized silicon nitride photonic integrated circuits. The weak thermo-optical effect limits the high-efficiency, low-power consumption applications. In this paper, a stepped index waveguide structure is studied to reduce the bending loss by enhancing the mode confinement. A bend with a radius of 30μm is designed using Ansys MODE. Polymer with a high thermo-optic coefficient is used as the cladding of the silicon nitride waveguide to improve the tuning performance of the phase shifter. The grooves around the waveguide also acts as an adiabatic trench to increase the efficiency of the thermal electrode. A π phase shift under thermal tuned power of 7.5mW is achieved with a 300μm long silicon nitride waveguide. Finally, a cascaded silicon nitride micro-ring resonator with radius of 50μm is designed to achieve an efficient filter with a wide tuning range of 116nm. This scheme provides a novel approach for high-density, wide-tunable and miniaturized devices in silicon nitride photonic integrated circuits.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"8 1","pages":"1276406 - 1276406-5"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139224240","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

Active milliseconds zooming and tracking optics based on liquid lenses and a high-speed gaze controller 基于液态透镜和高速凝视控制器的主动毫秒级变焦和跟踪光学系统

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686749

Jiaqi Li, Lin Li, Lihui Wang, Leijin Li, Shaoyong Li

{"title":"Active milliseconds zooming and tracking optics based on liquid lenses and a high-speed gaze controller","authors":"Jiaqi Li, Lin Li, Lihui Wang, Leijin Li, Shaoyong Li","doi":"10.1117/12.2686749","DOIUrl":"https://doi.org/10.1117/12.2686749","url":null,"abstract":"The traditional method of monitoring cameras is employed in robot vision, surveillance cameras, and so on. However, it cannot track as fast as expected due to the large inertia of the camera and mechanical pan-tilt. It also decreases the optical resolution because of the digital zoom on the interest area. Therefore, we proposed high-speed zooming and tracking optics that consists of an optical zooming unit and an active tracking unit. The two units are designed with coaxial optical paths by a beam splitter. The zooming unit is built with three liquid lenses, one glass lens, and a high-speed camera. It can continuously change the magnification from 1x to 2x. By controlling the optical powers of three liquid lenses, the focal length of the zooming unit can be changed from 40 to 80 mm within milliseconds. The tracking unit composed of a high-speed mirror-based gaze controller, a high-speed camera, and pupil shift optics, can track the object and keep it in the center of both views. In addition, the zooming unit provides a compensation algorithm for the zooming unit to achieve adaptive zoom accurately. The experiment shows that the zooming unit performs adaptive optical zoom, and the tracking unit recognizes the object by adaptive tracking algorithm within 6 milliseconds.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"23 1","pages":"1276505 - 1276505-9"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139224731","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

A study on the improvement of sensitivity consistency in Sagnac photoacoustic sensing system 关于提高萨格纳克光声传感系统灵敏度一致性的研究

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687229

Ruixi Tang, Xinyu Zheng, Qianqian Zhang, Jiang Wang, Ning Wang, Jie Zhang, Jianjun Chen, Yong Zhu

引用次数: 0

Design of micro-LED pico-projection optical engine based on an image fiber 基于图像光纤的微型 LED 微投影光学引擎设计

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687360

Huajian Jin, Zijian Lin, Weijie Hao, Y. Ye, Sheng Xu, Qun Yan, Tailiang Guo, Enguo Chen

{"title":"Design of micro-LED pico-projection optical engine based on an image fiber","authors":"Huajian Jin, Zijian Lin, Weijie Hao, Y. Ye, Sheng Xu, Qun Yan, Tailiang Guo, Enguo Chen","doi":"10.1117/12.2687360","DOIUrl":"https://doi.org/10.1117/12.2687360","url":null,"abstract":"Micro light-emitting diode (Micro-LED) has the advantages of high brightness, low power consumption, and long life. It has great potential and broad application prospects. Using micro-LED as the light source and image source of the projection system can greatly reduce the size and power consumption of the system. However, the electrical module and the optical module of the micro-LED pico-projection system cannot be separated. This paper uses image fiber to effectively separate the electrical module and optical module in the optical engine, and designs a micro-LED pico-projection optical engine based on an image fiber. This optical engine is composed of a projection lens group, an image fiber and a micro-LED. The projection lens group is composed of 5 spherical lenses, with the total length of 6.752mm and the focal length of 2.8mm. The modulation transfer function (MTF) is higher than 0.8@32lp/mm, and the distortion is below 2%. The image fiber adopts a multi-core fiber with a diameter of 2mm and a resolution of 32lp/mm. Finally, the overall simulation model of the optical engine is built to prove its feasibility.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"16 1","pages":"127650A - 127650A-6"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139225456","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

Dual optical frequency combs generation with frequency-shifted feedback laser, method, and applications 利用移频反馈激光器生成双光学频率梳、方法和应用

SPIE/COS Photonics Asia Pub Date : 2023-11-27 DOI: 10.1117/12.2687195

Sergey N. Mantsevich, E. Kostyleva, Vladimir Khorkin

引用次数: 0

OCT-specific signal features for semi-automatic semantic scans annotation and segmentation 用于半自动语义扫描注释和分割的 OCT 特定信号特征

SPIE/COS Photonics Asia Pub Date : 2023-11-27 DOI: 10.1117/12.2686858

A. A. Sovetsky, A. Matveyev, A. A. Zykov, V. Zaitsev, L. Matveev

引用次数: 0