Advanced Photonics Nexus最新文献_第9页

Deep learning spatial phase unwrapping: a comparative review 深度学习空间相位展开:比较综述

Advanced Photonics Nexus Pub Date : 2022-08-03 DOI: 10.1117/1.APN.1.1.014001

Kaiqiang Wang, Q. Kemao, Jianglei Di, Jianlin Zhao

{"title":"Deep learning spatial phase unwrapping: a comparative review","authors":"Kaiqiang Wang, Q. Kemao, Jianglei Di, Jianlin Zhao","doi":"10.1117/1.APN.1.1.014001","DOIUrl":"https://doi.org/10.1117/1.APN.1.1.014001","url":null,"abstract":"Abstract. Phase unwrapping is an indispensable step for many optical imaging and metrology techniques. The rapid development of deep learning has brought ideas to phase unwrapping. In the past four years, various phase dataset generation methods and deep-learning-involved spatial phase unwrapping methods have emerged quickly. However, these methods were proposed and analyzed individually, using different strategies, neural networks, and datasets, and applied to different scenarios. It is thus necessary to do a detailed comparison of these deep-learning-involved methods and the traditional methods in the same context. We first divide the phase dataset generation methods into random matrix enlargement, Gauss matrix superposition, and Zernike polynomials superposition, and then divide the deep-learning-involved phase unwrapping methods into deep-learning-performed regression, deep-learning-performed wrap count, and deep-learning-assisted denoising. For the phase dataset generation methods, the richness of the datasets and the generalization capabilities of the trained networks are compared in detail. In addition, the deep-learning-involved methods are analyzed and compared with the traditional methods in ideal, noisy, discontinuous, and aliasing cases. Finally, we give suggestions on the best methods for different situations and propose the potential development direction for the dataset generation method, neural network structure, generalization ability enhancement, and neural network training strategy for the deep-learning-involved spatial phase unwrapping methods.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130042095","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: 18

General treatment of dielectric perturbations in optical rings 光学环中介电扰动的一般处理

Advanced Photonics Nexus Pub Date : 2022-07-01 DOI: 10.1117/1.APN.1.1.016004

K. McGarvey, P. Bianucci

引用次数: 1

Orbital angular momentum comb generation from azimuthal binary phases 由方位角二相产生的轨道角动量梳

Advanced Photonics Nexus Pub Date : 2022-06-29 DOI: 10.1117/1.APN.1.1.016003

Shiyao Fu, Zijun Shang, L. Hai, Lei Huang, Yanlai Lv, Chunqing Gao

{"title":"Orbital angular momentum comb generation from azimuthal binary phases","authors":"Shiyao Fu, Zijun Shang, L. Hai, Lei Huang, Yanlai Lv, Chunqing Gao","doi":"10.1117/1.APN.1.1.016003","DOIUrl":"https://doi.org/10.1117/1.APN.1.1.016003","url":null,"abstract":"Abstract. Since Allen et al. demonstrated 30 years ago that beams with helical wavefronts carry orbital angular momentum (OAM), the OAM of beams has attracted extensive attention and stimulated lots of applications in both classical and quantum physics. Akin to an optical frequency comb, a beam can carry multiple various OAM components simultaneously. A series of discrete, equally spaced, and equally weighted OAM modes comprise an OAM comb. Inspired by the spatially extended laser lattice, we demonstrate both theoretically and experimentally an approach to producing OAM combs through azimuthal binary phases. Our study shows that transition points in the azimuth determine the OAM distributions of diffracted beams. Multiple azimuthal transition points lead to a wide OAM spectrum. Moreover, an OAM comb with any mode spacing is achievable through reasonably setting the position and number of azimuthal transition points. The experimental results fit well with theory. This work presents a simple approach that opens new prospects for OAM spectrum manipulation and paves the way for many applications including OAM-based high-security encryption and optical data transmission, and other advanced applications.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121054277","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: 12

Ultra-broadband and low-loss edge coupler for highly efficient second harmonic generation in thin-film lithium niobate 铌酸锂薄膜中高效二次谐波产生的超宽带低损耗边缘耦合器

Advanced Photonics Nexus Pub Date : 2022-06-29 DOI: 10.1117/1.APN.1.1.016001

Xiaoyue Liu, Shengqian Gao, Chi Zhang, Ying Pan, Rui Ma, Xian Zhang, Lin Liu, Zhenda Xie, Shi-Deng Zhu, Siyuan Yu, Xinlun Cai

{"title":"Ultra-broadband and low-loss edge coupler for highly efficient second harmonic generation in thin-film lithium niobate","authors":"Xiaoyue Liu, Shengqian Gao, Chi Zhang, Ying Pan, Rui Ma, Xian Zhang, Lin Liu, Zhenda Xie, Shi-Deng Zhu, Siyuan Yu, Xinlun Cai","doi":"10.1117/1.APN.1.1.016001","DOIUrl":"https://doi.org/10.1117/1.APN.1.1.016001","url":null,"abstract":"Abstract. Thin-film lithium niobate is a promising material platform for integrated nonlinear photonics, due to its high refractive index contrast with the excellent optical properties. However, the high refractive index contrast and correspondingly small mode field diameter limit the attainable coupling between the waveguide and fiber. In second harmonic generation processes, lack of efficient fiber-chip coupling schemes covering both the fundamental and second harmonic wavelengths has greatly limited the overall efficiency. We design and fabricate an ultra-broadband tri-layer edge coupler with a high coupling efficiency. The coupler allows efficient coupling of 1 dB / facet at 1550 nm and 3 dB / facet at 775 nm. This enables us to achieve an ultrahigh overall second harmonic generation normalized efficiency (fiber-to-fiber) of 1027 % W − 1 cm − 2 (on-chip second harmonic efficiency ∼3256 % W − 1 cm − 2) in a 5-mm-long periodically-poled lithium niobate waveguide, which is two to three orders of magnitude higher than that in state-of-the-art devices.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115336568","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: 6

Deterministic generation of large-scale hyperentanglement in three degrees of freedom 三自由度大尺度超纠缠的确定性生成

Advanced Photonics Nexus Pub Date : 2022-06-29 DOI: 10.1117/1.APN.1.1.016002

Xutong Wang, Sheng Yu, Shengshuai Liu, Kai Zhang, Yanbo Lou, Wei Wang, J. Jing

{"title":"Deterministic generation of large-scale hyperentanglement in three degrees of freedom","authors":"Xutong Wang, Sheng Yu, Shengshuai Liu, Kai Zhang, Yanbo Lou, Wei Wang, J. Jing","doi":"10.1117/1.APN.1.1.016002","DOIUrl":"https://doi.org/10.1117/1.APN.1.1.016002","url":null,"abstract":"Abstract. Entanglement serves as a fundamental resource for quantum information protocols, and hyperentanglement has received an increasing amount of attention for its high-capacity characteristic. Increasing the scale of hyperentanglement, i.e., the number of modes in a hyperentangled system, is crucial for enhancing its capability in quantum information processing. Here, we demonstrate the generation of large-scale continuous-variable (CV) hyperentanglement in three degrees of freedom (DOFs), including azimuthal and radial indices of Laguerre–Gaussian (LG) modes and frequency. In our experiment, 216 pairs of hyperentangled modes are deterministically generated from the four-wave mixing process in an atomic vapor. In addition, we show that the entanglement between coherent LG superposition modes denoted by both azimuthal and radial quantum numbers can also be generated from this system. Such large-scale CV hyperentanglement in three DOFs presents an efficient scheme to significantly increase the information capacity of the CV system. Our results provide a new platform for studying CV quantum information and open the avenue for constructing high-capacity parallel and multiple-DOF CV quantum information protocols.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133746315","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: 4

High-repetition-rate seeded free-electron laser enhanced by self-modulation 自调制增强的高重复率种子自由电子激光器

Advanced Photonics Nexus Pub Date : 2022-06-05 DOI: 10.1117/1.APN.2.3.036004

Hanxiang Yang, Jiawei Yan, H. Deng

{"title":"High-repetition-rate seeded free-electron laser enhanced by self-modulation","authors":"Hanxiang Yang, Jiawei Yan, H. Deng","doi":"10.1117/1.APN.2.3.036004","DOIUrl":"https://doi.org/10.1117/1.APN.2.3.036004","url":null,"abstract":"Abstract. The spectroscopic methods for the ultrafast electronic and structural dynamics of materials require fully coherent extreme ultraviolet and soft X-ray radiation with high-average brightness. Seeded free-electron lasers (FELs) are ideal sources for delivering fully coherent soft X-ray pulses. However, due to state-of-the-art laser system limitations, it is challenging to meet the ultraviolet seed laser’s requirements of sufficient energy modulation and high repetition rates simultaneously. The self-modulation scheme has been proposed and recently demonstrated in a seeded FEL to relax the seed laser requirements. Using numerical simulations, we show that the required seed laser intensity in the self-modulation is ~3 orders of magnitude lower than that in the standard high-gain harmonic generation (HGHG). The harmonic self-modulation can launch a single-stage HGHG FEL lasing at the 30th harmonic of the seed laser. Moreover, the proof-of-principle experimental results confirm that the harmonic self-modulation can still amplify the laser-induced energy modulation. These achievements reveal that the self-modulation can not only remarkably reduce the requirements of the seed laser but also improve the harmonic upconversion efficiency, which paves the way for realizing high-repetition-rate and fully coherent soft X-ray FELs.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122308981","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: 3

Deterministic N-photon state generation using lithium niobate on insulator device 利用绝缘体上的铌酸锂器件生成确定性 N 光子态

Advanced Photonics Nexus Pub Date : 2022-05-30 DOI: 10.1117/1.APN.2.1.016003

Hua-Ying Liu, Ming-Chi Shang, Xiaoyi Liu, Ying Wei, Minghao Mi, Lijian Zhang, Y. Gong, Zhenda Xie, Shirong Zhu

引用次数: 2

Supporting quantum technologies with an ultralow-loss silicon photonics platform 支持量子技术的超低损耗硅光子学平台

Advanced Photonics Nexus Pub Date : 2022-01-12 DOI: 10.1117/1.APN.2.2.024002

M. Cherchi, A. Bera, A. Kemppinen, J. Nissilä, K. Tappura, M. Caputo, Lauri Lehtimäki, J. Lehtinen, J. Govenius, T. Hassinen, M. Prunnila, T. Aalto

引用次数: 2