Applied optics最新文献_第2页

Broadband optically pumped NMR gyroscope technique based on Gaussian white noise phase modulation. 基于高斯白噪声相位调制的宽带光泵核磁共振陀螺仪技术。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.575074

Tong Huo, Jianhua Yang, Zhihang Zhang, Zhiguo Wang, Dapeng Han, Lijun Miao, Dengwei Zhang

引用次数: 0

Composite coating with engineered microparticles for multiband infrared stealth and efficient radiative heat dissipation. 具有多波段红外隐身和高效辐射散热的工程微粒复合涂层。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.574080

Bowei Xie, Jian Zhan, Mu Du

{"title":"Composite coating with engineered microparticles for multiband infrared stealth and efficient radiative heat dissipation.","authors":"Bowei Xie, Jian Zhan, Mu Du","doi":"10.1364/AO.574080","DOIUrl":"https://doi.org/10.1364/AO.574080","url":null,"abstract":"The fundamental conflict between infrared stealth and thermal management, where suppressing thermal emission for camouflage inevitably causes detrimental heat accumulation, poses a long-standing challenge in modern military technology. This work resolves this paradox through a bottom-up design of a particle composite coating, where complex spectral selectivity is engineered at the single-particle level. We computationally designed and validated a multilayer spherical particle, consisting of a CaMg(CO3)2 shell, a VO2 inner shell, and a Ge core, embedded within a polyethylene (PE) binder. The synergistic roles of the materials allow for precise spectral control: CaMg(CO3)2 provides a primary emission peak in the 6-7 µm range, VO2 broadens this non-atmospheric window for enhanced heat dissipation, and the Ge layer simultaneously shields absorption in the infrared stealth bands and boosts absorption in the VIS-NIR spectrum. The optimized coating achieves a high average emissivity of 0.6471 in the VIS-NIR and 0.5091 in the 5-8 µm band for effective thermal radiation, while maintaining exceptionally low emissivity in the atmospheric window bands (SWIR: 0.2326, MWIR: 0.3208, and LWIR: 0.0915). Simulated thermal imaging demonstrates superior stealth performance. This coating offers a scalable and effective strategy for developing next-generation materials compatible with both multiband stealth and heat dissipation requirements.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"8011-8018"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115973","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

Hyperspectral analysis for automated quantification of total phosphorus in enriched soil samples. 富营养化土壤样品中全磷自动定量的高光谱分析。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.568506

Fabio Eliveny Rivadeneira-Bolaños, Sandra Esperanza Nope-Rodríguez, Martha Isabel Páez-Melo

{"title":"Hyperspectral analysis for automated quantification of total phosphorus in enriched soil samples.","authors":"Fabio Eliveny Rivadeneira-Bolaños, Sandra Esperanza Nope-Rodríguez, Martha Isabel Páez-Melo","doi":"10.1364/AO.568506","DOIUrl":"https://doi.org/10.1364/AO.568506","url":null,"abstract":"Phosphorus is an essential macronutrient for plant development, and its availability in soil directly influences agricultural productivity. However, traditional laboratory quantification of phosphorus is costly, slow, and destructive. This study introduces a system for automated quantification of total phosphorus (TP) using hyperspectral analysis on soil samples enriched with phosphorus fertilizer (P2O5). A previously developed acquisition protocol by the authors was employed, involving the design, development, and construction of a platform equipped with a Bayspec OCI-F camera. The lighting system was designed to ensure adequate spectral response in the visible (VIS) and near-infrared (NIR) regions, covering the range from 420 to 1000 nm. A total of 152 soil samples with varying phosphorus concentrations were prepared. From the hyperspectral images (HSI), the spectral response of each sample was extracted. The data were divided into 80% for training and 20% for validation. Partial least squares regression (PLSR) was used to estimate total phosphorus (TP), and variable importance in projection (VIP) analysis reduced the spectral bands from 145 to 78. Subsequently, a forward propagation artificial neural network (ANN) was trained to predict TP content in new samples. The system achieved a coefficient of determination (R2) of 0.99401, a ratio of performance to deviation (RPD) of 9.1, and a ratio of performance to interquartile range (RPIQ) of 13.9, indicating a good fit. Additionally, it achieved a mean absolute percentage error (MAPE) of 12.1% and a root-mean-square error (RMSE) of 7426 ppm, demonstrating reliable estimation of total phosphorus in soils.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"8051-8067"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116025","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

Slope boundary adjustment technique for zonal wavefront recovery method. 带向波前恢复方法的边坡边界平差技术。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.574175

Vu-Hai-Linh Nguyen, Young-Sik Ghim, Hyug-Gyo Rhee

引用次数: 0

Phase-ReNet: a phase regression network for feature detection from a defocused pattern for camera calibration. phase - renet：一个相位回归网络，用于从相机校准的散焦模式中检测特征。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.564036

Wenhui Hou, Chuanqi Zhou, Haojie Zhu, Dashan Zhang, Yuwei Wang, Gao Jing, Lu Liu

引用次数: 0

Deep learning approach for flow visualization in background-oriented schlieren. 面向背景纹影流动可视化的深度学习方法。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.572042

Viren S Ram, Tullio de Rubeis, Dario Ambrosini, Rajshekhar Gannavarpu

引用次数: 0

Design of freeform microlens arrays with prescribed luminance distributions for MicroLED optical packaging. 用于MicroLED光学封装的具有规定亮度分布的自由曲面微透镜阵列设计。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.567792

Yijie Ni, Dewei Feng, Donglin Ma

{"title":"Design of freeform microlens arrays with prescribed luminance distributions for MicroLED optical packaging.","authors":"Yijie Ni, Dewei Feng, Donglin Ma","doi":"10.1364/AO.567792","DOIUrl":"https://doi.org/10.1364/AO.567792","url":null,"abstract":"Non-uniform angular luminance distribution and limited viewing-angle control remain key challenges in MicroLED display modules. In this paper, we propose an optical packaging structure and a design method based on a freeform microlens array (MLA) to achieve prescribed angular luminance distributions. While freeform optics have been extensively studied for general illumination, their application in MicroLED packaging for directional luminance control has been rarely explored. Here, we extend an integrable ray mapping framework into the luminance domain and apply it to the design of MicroLED packaging optics, enabling compact, high-efficiency, and high-uniformity beam shaping. A lossless energy transformation strategy is first employed to convert the target luminance distribution into a uniformly sampled angular domain, addressing sampling imbalances at large viewing angles. An extended integrable ray mapping method is then used to compute a mapping between the MicroLED source domain and the angular domain, from which manufacturable single-surface freeform lenses and MLAs are derived. Two design examples-under symmetric and non-rotationally symmetric viewing conditions-are presented to validate the proposed approach. Simulation results demonstrate that the method achieves accurate angular luminance control and high uniformity across the desired viewing cone, confirming its practicality for real-world MicroLED display applications.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"7875-7884"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115936","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

Quantum state preparation of time-bin encoding based on SOI integrated chips. 基于SOI集成芯片的时间盒编码的量子态制备。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.560473

Hanming Yang, Chunxue Zhang, Pengwei Cui, Junchi Ma, Liyong Guo, Song Huang, Jianguang Li, Jiashun Zhang, Yue Wang, Xiaojie Yin, Wei Chen, YuanDa Wu, Junming An

{"title":"Quantum state preparation of time-bin encoding based on SOI integrated chips.","authors":"Hanming Yang, Chunxue Zhang, Pengwei Cui, Junchi Ma, Liyong Guo, Song Huang, Jianguang Li, Jiashun Zhang, Yue Wang, Xiaojie Yin, Wei Chen, YuanDa Wu, Junming An","doi":"10.1364/AO.560473","DOIUrl":"https://doi.org/10.1364/AO.560473","url":null,"abstract":"Quantum key distribution (QKD) ensures unconditional security for public key encryption by utilizing the principles of quantum mechanics. This study designs and fabricates a QKD chip based on the silicon-on-insulator (SOI) platform, employing a time-bin encoding scheme with decoy states. In the design, we integrate a slow thermo-optic phase modulator with a carrier-depletion modulator to ensure high fidelity of quantum states and high-speed encoding capabilities, enabling precise and flexible time-bin encoding. We achieve the encoding and decoding of four BB84 quantum states at a repetition rate of 100 MHz. In the experiment, the visibility of the interference fringes for the phase state |+⟩ is 93.66%, and for the phase state |-⟩, it is 92.36%. The extinction ratios for the time states |0⟩ and |1⟩ are 19.33 and 18.72 dB, respectively. The experimental results demonstrate that the chip has efficient quantum state preparation capability, providing significant support for the practical implementation of quantum key distribution technology. Additionally, we propose a new chip structure, to our knowledge, using SOI and Si3N4 heterogeneous integration. The SOI waveguide is used for high-speed modulation encoding, while the delay line is composed of Si3N4 waveguides. This structure is designed to address the stability issues of the chip caused by temperature variations.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"7948-7956"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116093","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

Flow-ICP: semantic segmentation of point clouds based on 4D time-series alignment. Flow-ICP：基于4D时间序列对齐的点云语义分割。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.562944

Shuyi Tan, Chao Huang, Yi Zhang, Yang Wang

{"title":"Flow-ICP: semantic segmentation of point clouds based on 4D time-series alignment.","authors":"Shuyi Tan, Chao Huang, Yi Zhang, Yang Wang","doi":"10.1364/AO.562944","DOIUrl":"https://doi.org/10.1364/AO.562944","url":null,"abstract":"The semantic segmentation is a critical task in LiDAR point cloud processing. Leveraging temporal information to provide contextual data for regions with low visibility or sparse observations has recently become a popular research direction, especially in autonomous driving. Existing methods, however, are often over-reliant on past frames, leading to cumulative errors (drift) caused by unconstrained frame-by-frame stacking. This paper proposes a dynamic alignment of historical frame memory information to ensure consistency with the observations of the current frame, reducing deviations caused by viewpoint changes or object movements and ensuring more accurate capture of current frame features. In addition, a new multi-scale feature fusion method, to the best of our knowledge, was introduced using the spatiotemporal (ST) method to extract the ST features, which reduces the inconsistencies between 2D range image coordinates and 3D Cartesian outputs. This approach enhances feature representation by optimizing and fusing the aligned channel features. This method was evaluated on the SemanticKITTI and SensatUrban datasets. The experimental results showed that it outperforms existing state-of-the-art methods regarding accuracy.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"8068-8076"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115965","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

BRUCE: a metrological system for characterizing the beam-intensity rotational uniformity of side-scanning optical miniature probes. 布鲁斯：一种测量系统，用于表征侧面扫描光学微型探头的光束强度旋转均匀性。

Applied optics Pub Date : 2025-09-20 DOI: 10.1364/AO.573028

Jin Young Youm, Joon-Mo Yang

{"title":"BRUCE: a metrological system for characterizing the beam-intensity rotational uniformity of side-scanning optical miniature probes.","authors":"Jin Young Youm, Joon-Mo Yang","doi":"10.1364/AO.573028","DOIUrl":"https://doi.org/10.1364/AO.573028","url":null,"abstract":"To successfully translate optical miniature probes, such as the endoscopic miniprobe, catheter probe, and capsular probe, into clinical practice, it is essential to accurately characterize their performance and thereby precisely define the final specifications of the related device outcomes in various aspects such as biochemical, electrical, physical, mechanical, and optical aspects. Although a variety of related device concepts have been introduced in the biophotonics field in the past three decades, all the previous studies, to the best of our knowledge, focused on showcasing their biomedical potential or applications rather than developing or solidifying related metrologies to objectively characterize their performances. In this study, we developed a metrological system that can measure the beam-intensity rotational uniformity of a side-scanning optical miniature probe, regardless of its beam firing angle to the probe axis. Moreover, by applying the developed system to our photoacoustic endoscopic probe prior to conducting in vivo imaging experiments, we were able to confirm the beam uniformity far more accurately than was previously possible by visual inspection. In this paper, we introduce the basic concept and operating principles of the developed system and discuss the importance of characterizing the relevant beam-intensity uniformity.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"7996-8004"},"PeriodicalIF":0.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115995","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