检索结果-内蒙古大学图书馆

High-power single-frequency handedness switchable vortex laser from an off-axis pumped Er:YAG nonplanar ring oscillator

引用

Optics Letters 2025年第8期50卷 2590-2593页

作者： Yu, Yang Wu, Weichong Xiao, Jiawen Hai, Lan Zhang, Zhichao Wang, Qing Fu, Shiyao Gao, Chunqing School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory of Near-Surface Detection Beijing100072 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology Beijing100081 China

We demonstrate a high-power single-frequency, handednessswitchable vortex laser at 1645 nm, directly generated from an off-axis pumped Er:YAG nonplanar ring oscillator. Narrow-linewidth Laguerre-Gauss (LG) modes of orders -2, -1, +1, and +2 are obtained, with output powers of 4.53W, 7.09W, 7.03W and 4.58W, respectively. The linewidth of the LG0,+2 mode is measured to be 3.4 kHz. This work provides a compact and high-power vortex laser suitable for applications such as optical remote sensing. © 2025 Optica Publishing Group.

关键词： Linewidth

来源：评论

学校读者我要写书评

暂无评论

Evaluation of occlusion immunities of free-space orbital angular momentum shift keying

引用

Optics Express 2025年第6期33卷 13494-13505页

作者： Yang, Jinyu Zhang, Shurui Li, Lang Gao, Mingwei Gao, Chunqing Fu, Shiyao School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology of the People’s Republic of China Beijing100081 China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of the People’s Republic of China Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China

Orbital angular momentum (OAM) provides a new high-dimensional degree-of-freedom for lasers enabling high-dimensional shift keying, thus showing huge potential in free-space optical data-transmissions. Ensuring the accuracy of data transmission is of concern in any communication system. However, in the free-space OAM shift keying link, interferences from environmental occlusions will broaden the OAM spectrum and thus affect the correctness of information received. In this paper, the occlusion immunities of two commonly used OAM shift keying strategies—OAM-encoding-symbols and OAM-encoding-bits—are evaluated under different occlusion scenarios. We introduce radial, azimuthal, and random occlusions into the link and then analyze the bit error rate (BER) of various OAM shift keying strategies. The results illustrate that the strategy of OAM-encoding-symbols exhibits stronger occlusion immunity with zero BER than OAM-encoding-bits. Moreover, proof-of-concept experiments are done to transmit grayscale images under occlusions. The final decoding results show identical data-transmission performance with simulations. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Bit error rate

来源：评论

学校读者我要写书评

暂无评论

Selective formation of generalized optical skyrmions

引用

Optics Letters 2025年第9期50卷 2840-2843页

作者： Zhang, Haojun Gao, Chunqing Fu, Shiyao School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology of the People’s Republic of China Beijing100081 China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of the People’s Republic of China Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China

Optical skyrmions, a type of topologically protected quasiparticle, have undergone various deformations in recent years. In this Letter, we present a scheme that can achieve the selective formation of generalized optical skyrmions. In our proposal, a liquid-crystal spatial light modulator and a variable liquid-crystal retarder, both of which are commonly programmable devices, are employed, allowing for the on-demand precise manipulation of topological textures of various quasiparticles including but not limited to skyrmions, antiskyrmions, and bimerons. The proof-of-concept experiments illustrate that generalized optical skyrmions whose skyrmion number up to 5 can be well generated with on-demand tailored topological textures. While maintaining a simple setup, the system demonstrates a notable capacity for the manipulation of intricate high-order textures, signifying its considerable potential for extensive and sophisticated applications in the generation and manipulation of skyrmions. © 2025 Optica Publishing Group.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

End-to-end optimization for a wide-field-of-view metalens with an aperture stop

引用

Journal of the Optical Society of America B: Optical Physics 2025年第5期42卷 1146-1153页

作者： Ren, Ziming Zhang, Jia Moghaddasi, Mojtaba Xiong, Chenjie Huang, Jianzhou Meng, Bo Hu, Bin National Key Laboratory on Near-surface Detection Beijing100072 China Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China China Academy of Aerospace Science and Innovation Beijing100089 China State Key Laboratory of Luminescence Science and Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

Metalenses have great application potential to realize ultra-compact wide-field-of-view (WFOV) optics for surveillance cameras, industrial vision, and medical imaging. Due to the relatively low fabrication requirement, metalenses with an aperture stop for WFOV have attracted much interest recently. However, most designs for this structure rely on commercial design software or exclude the optimization of the aperture size. This work proposes a design framework for a metalens with an aperture stop based on an end-to-end optimization for WFOV imaging, which achieves joint optimization of aperture diameter, substrate thickness, and metalens phase distribution. Using this framework, a metalens with an aperture that achieves a FOV of 160◦ in the mid-infrared region is designed and demonstrated by both theoretical calculation and simulation. This work is expected to provide alternative design options for miniaturized WFOV imaging optical systems. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Biomedical imaging Imaging systems Optical imaging Optical systems Phase modulation Systems design

来源：评论

学校读者我要写书评

暂无评论

Analysis of temperature detection performance of vibration-rotation Raman lidar based on different calibration functions

引用

Optics Express 2025年第9期33卷 18759-18778页

作者： Chen, Siying Yu, Yinghong Tan, Wangshu Chen, He Guo, Pan Cao, Rongzheng Xie, Yixuan Hu, Rui Bu, Zhichao Yu, Jie Liu, Junshuai Yang, Haokai School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019 China National Key Laboratory on Near-surface Detection Beijing100072 China Meteorological Observation Centre China Meteorological Administration Beijing100081 China

Rotational Raman (RR) lidar is widely employed for atmospheric temperature detection, but its detection capability is constrained in cloudy or hazy conditions due to the interference of elastic scattering leakage to the pure RR channels. To address this limitation, a vibrational-rotational Raman (VR) temperature measurement technique has been proposed and validated. This study compares the performance of VR and RR techniques through simulations and observational experiments. The simulations account for both the theoretical (intrinsic) errors of the methods and the impact of random errors. Additionally, this study evaluates the performance of ten calibration functions (CFs) in the VR method, including nine applied to VR for the first time. The results indicate that when the signal-to-noise ratio of the low quantum number channel is low, the VR technique can effectively improve the detection performance of the system. For the VR technique, all tested CFs can successfully retrieve atmospheric temperature. Among them, the four-coefficient forward CFs achieve the best calibration performance within the calibration interval, while the linear CF performs best in extrapolation scenarios. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Temperature measurement

来源：评论

学校读者我要写书评

暂无评论

Temporal multiplexing coding strategy for spatiotemporal compressed imaging 4

Temporal multiplexing coding strategy for spatiotemporal com...

引用

4th International Computational Imaging Conference, CITA 2024

作者： Hao, Xiaowen Ke, Jun School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Photo-electronic Imaging Technology and System Ministry of Education of China Beijing100081 China National Key Laboratory on Near-surface Detection Beijing100072 China

ISBN: (纸本)9781510688834

Spatiotemporal compressed imaging(STCI) aims to improve the spatial and temporal resolution of an imaging system simultaneously, which can effectively alleviate the mutual constraints between the two imaging resolutions. However, the development of STCI is limited by the effectively modulate target scenes in dual-domain, and by the back-end reconstruction process which doesn't work well for high compression ratio(CR). In this paper, we propose a temporal multiplexing coding strategy for STCI, which can effectively help the reconstruction algorithm for a large CR. Simulated experiments are implemented to demonstrate our idea. The proposed method can achieve nice spatiotemporal reconstructions with CR equal to 128:1, in which the spatial CR is 16:1 and the temporal CR is 8:1. © 2025 SPIE.

关键词： Image coding

来源：评论

学校读者我要写书评

暂无评论

Optimizing object classification with single-pixel imaging and transformer networks 4

Optimizing object classification with single-pixel imaging a...

引用

4th International Computational Imaging Conference, CITA 2024

作者： Cheng, Yin Liao, Yusen Sun, Xin Ke, Jun School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Photo-electronic Imaging Technology and System Ministry of Education of China Beijing100081 China National Key Laboratory on Near-surface Detection Beijing100072 China

ISBN: (纸本)9781510688834

Traditional computer vision tasks rely on high-quality images for classification, but single-pixel imaging (SPI) uses compressive sensing with a bucket detector to simplify hardware and reduce costs. However, factors like atmospheric turbulence can degrade SPI image quality, lowering classification accuracy. To address this, a block-based single-pixel image-free transformer classification framework is proposed. It uses a learnable binary sampling matrix for flexible sampling during SPI and divides the measurements into blocks, which are processed by a transformer network. Each block is treated as a sequence element, allowing the transformer to capture spatial and contextual relationships. Experiments show strong robustness to atmospheric turbulence, achieving 87% classification accuracy even at a 1% sampling rate, making this method suitable for challenging environments. © 2025 SPIE.

关键词： Pixels

来源：评论

学校读者我要写书评

暂无评论

Research on multi-layer lobster eye detection technology 10

Research on multi-layer lobster eye detection technology

引用

10th Symposium on Novel Optoelectronic detection technology and Applications

作者： Ji, Fan Wang, JunYa Chang, Jun Zhang, YunQiang Key Laboratory of Photoelectronic Lmaging Technology and System of Ministry of Education of China School of Optics and Photonics Beijng Institute of Technology Beijng100081 China National Key Laboratory on Near-surface Detection Beijing100072 China National Key Laboratory of Air-based Information Perception and Fusion Luoyang471009 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

This paper focuses on the imaging technology of multi-layer lobster vision system based on infrared band, aiming to develop a multi-layer lobster eye coordination optical system that can improve the energy concentration. By designing the structure of the lobster eye lens and using the ray tracing software for simulation analysis, the energy concentration of the center of the cross focal spot generated by the lens is analyzed in detail. The optical system of multi-layer lobster eye lens is also designed to achieve the goal of increasing the energy concentration of the system. The whole study not only optimizes the performance of the optical system, but also provides an important theoretical and practical basis for the future application of bionic optical systems. © 2025 SPIE.

关键词： Ray tracing

来源：评论

学校读者我要写书评

暂无评论

Depth map stitching using compound eye cameras for wide FOV imaging 10

Depth map stitching using compound eye cameras for wide FOV ...

引用

10th Symposium on Novel Optoelectronic detection technology and Applications

作者： Qiao, Zhibo Hao, Qun Li, Shibiao Cheng, Yang School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314003 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Depth information is an important tool in the computer vision field for object detection, recognition, and 3D modeling. Conventional depth sensors have a limited field of view(FOV) and provide limited depth information. Depth map stitching has been proposed to construct a large FOV image by combining depth maps from different perspectives. Due to the sparsity of features and susceptibility to lighting conditions in the depth images, stitching faces a challenge as it often relies on feature matching for obtaining mapping matrices. To overcome this issue, this paper proposes an algorithm that utilizes color image features to guide depth map stitching. Initially, the LightGlue algorithm based on SuperPoint features is employed for precise feature matching to obtain accurate homography matrices. Depth maps are then generated using stereo vision and aligned with color images, effectively transforming the depth map stitching challenge into a color image stitching task. Additionally, we designed a bionic compound eye imaging system that captures images in real time using multiple cameras. This system consists of eight cameras arranged in pairs at specific angles with a circular configuration, achieving an expanded FOV. Experimental results demonstrate that the system effectively captures depth maps with an FOV of 110°×90° and can display real-time video with 8 frames at 640 ×480 resolution. The maximum relative depth error is 5.7% @ 0.55m. In the future, this technology is expected to be applied in panoramic 3D reconstruction, underwater mapping, and autonomous driving. © 2025 SPIE.

关键词： Stereo image processing

来源：评论

学校读者我要写书评

暂无评论

Optical simulation and imaging performance evaluation on the influencing parameters of the Alvarez lenses 10

Optical simulation and imaging performance evaluation on the...

引用

10th Symposium on Novel Optoelectronic detection technology and Applications

作者： Li, Chaohui Hao, Qun Liu, Lin Cheng, Yang School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314003 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Optical varifocal systems have extensive applications such as consumer electronics, defense equipment, industrial monitoring, and medical devices. Traditional varifocal methods typically involve multiple lenses and mechanical components. The lenses often move along the optical axis using motors to achieve the varifocal ability. This configuration introduces some limitations, such as more structural complexity, larger size, slower varifocal speed, and higher production cost. Different from the traditional varifocal lenses, Alvarez lenses comprise two symmetrically arranged freeform surface phase plates moving perpendicular to the optical axis. The Alvarez lenses achieve a wide varifocal range through small lateral displacement offering a compact design and a large varifocal range. Besides the parameter of lateral displacement, the varifocal range and the imaging performance of the Alvarez lenses are influenced by other parameters. This paper aims to explore and analyze how different parameters impact the imaging performance of Alvarez lenses. The analysis focuses on the two parameters, i.e., the vector height modulation coefficient(A), the tilt of the freeform surface (D), air gaps, and installation errors. Parameter A controls the height difference between peaks and valleys of the freeform surface and directly affects the varifocal capability of the Alvarez lenses. Through the optical simulation of the Alvarez lens via OpticStudio software, we found that a decrease in the value of parameter A helps to reduce the rate of performance degradation. However, the smaller value of the parameter A necessitates a larger lateral displacement to achieve equivalent changes in focal length. The increase in displacement results in higher power consumption and a slower response time. Thus, selecting an optimal A value and refining D are crucial to enhancing the Alvarez lenses's overall performance. To identify the optimized parameters, we simulated five different sets of the param

关键词： Ray tracing

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：