Article
Optics
Jingyang Guo, Dede Zhai, Wenwen Lu, Shanyong Chen
Summary: This paper presents a method of interference microscopy combined with subaperture stitching for measuring the topography of bearings with helical grooves. By utilizing a special fixture and a four-axis scanning platform, motion errors introduced in subaperture scanning are corrected through an iterative stitching algorithm. Experimental results demonstrate the effectiveness of this method and provide guidance for evaluating machining errors and bearing performance.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Lipeng Wan, Tianbao Yu, Daomu Zhao, Wolfgang Loffler
Summary: By using a conventional arrayed image sensor and 2D Fourier analysis, it is possible to resolve sub-micrometer periodic patterns with a resolution far beyond the Nyquist limit set by the pixel size. This method also enables wavelength sensing with high resolving power.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Siyuan Jiang, Qiaozhi He, Yifan Xing, Linxian Liu, Jiamiao Yang
Summary: A multi-view stitching phase measuring deflectometry (PMD) method is proposed to capture the appearance of different regions using distinct sensors and a screen. The entire system is precisely calibrated to achieve high measurement accuracy.
Article
Optics
Azeem Ahmad, Anowarul Habib, Vishesh Dubey, Balpreet Singh Ahluwalia
Summary: Low coherence interference microscopy (LCIM) provides high spatial phase sensitivity for test specimens. A non-identical objective lens configuration is used for LCIM, and advanced iterative algorithm and principal component analysis algorithm are integrated to recover phase images without quadratic phase error.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Mechanical
Dhruvam Pandey, Rajshekhar Gannavarpu
Summary: Surface profilometry at the nanoscale level can be achieved using digital holographic microscopy setup. The proposed method extracts the encoded phase map in the hologram signal to measure the surface profile. The method demonstrates high robustness against noise and utilizes a low-cost imaging design. Experimental results show superior performance compared to existing methods in measuring 100 nanometers surface profile features.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Engineering, Multidisciplinary
Ka Hung Chan, Shengwang Du, Xian Chen
Summary: This study presents a theoretical exploration of surface step characterization using reflected incoherent-light differential interference microscopy, with consideration of the optical diffraction effect. By integrating localization analysis, a quantitative differential interference optical system is developed, which demonstrates high axial resolution in measuring surface height variation. The experiment successfully characterizes nanometer-size steps with subnanometer accuracy, indicating the potential of optical differential interference microscopy for real-time surface structure characterization in micro/nano-electromechanical systems.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Yan Hu, Zhongwei Liang, Shijie Feng, Wei Yin, Jiaming Qian, Qian Chen, Chao Zuo
Summary: The article introduces the Scheimpflug lens-based imaging model and its application, proposes a simplified imaging model based on projection, and develops calibration algorithms and rectification methods for stereo matching. The effectiveness and accuracy of the methods are verified through experiments.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Paul Christopher Montgomery, Remy Claveau, Sebastien Marbach, Manuel Flury
Summary: The work reviewed here involves adapting white light interference microscopy for local spectroscopy to measure the optical properties of microscopic structures. By processing the polychromatic fringe signal with Fourier transform and carefully calibrating the optical system, local reflectance spectra measurements are made. This approach allows for rapid spectral mapping of spatially extended surfaces in a single scan.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Analytical
Xinxue Ma, Jianli Wang, Bin Wang, Xinyue Liu
Summary: This article describes a method for measuring aspherical optical surfaces using phase retrieval technology. The method is based on an algorithm that samples defocus images and obtains phase information through Fourier optical diffraction theory and mathematical optimization. Experimental results demonstrate that this method can accurately estimate the wave-front and aberrations of aspherical optical surfaces.
Article
Engineering, Multidisciplinary
R. W. Maruda, S. Wojciechowski, N. Szczotkarz, S. Legutko, M. Mia, M. K. Gupta, P. Nieslony, G. M. Krolczyk
Summary: This study evaluates the impact of different cooling/lubricating techniques on the surface integrity during turning of AISI 1045 steel. The results show that applying MQCL + EP/AW turning method can generate surfaces with more even distribution of valleys and peaks, leading to a reduction in selected roughness height parameters.
Article
Engineering, Mechanical
Danilo Quagliotti
Summary: In this study, the assessment of systematic behavior based on frequentist statistics in the field of micro/nano metrology was analyzed. The proposed method is consistent with the well-known GUM recommendations. Three different case studies were evaluated, with model equations defined and traceability established. Systematic behavior was modeled in roughness parameters and step height measurements obtained from different types of optical microscopes, and compared to a calibrated contact instrument. The results demonstrated the applicability of the method to averaged elements in micrographs.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Engineering, Electrical & Electronic
Chen Wang, Xianyu Meng, Grzegorz Krolczyk, Heming Wei
Summary: Quantitative characterization and uncertainty evaluation of areal step height are increasingly important in semiconductor manufacturing. Traditional methods face problems of repeatability and reproducibility. To address this issue, we propose a cluster-based method that converts step characterizations into Euclidean distances through data reconstruction and K-means clustering, eliminating the need for plane fitting.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Multidisciplinary
Jie Li, Lin Chen, Wenbo Yang, Dun Liu, Xuedong Cao
Summary: This paper proposes a scanning distance measuring interferometer method for accurately measuring the transmitted wavefront of large-aperture flat optics. The feasibility of this method is validated by comparing the results with a phase measuring interferometer.
Article
Optics
Yuanyuan Sun, Yihan Wang, Daodang Wang, Stanley Pau, Rongguang Liang
Summary: We proposed a Wollaston-prism-based snapshot phase-shifting diffraction phase microscope (WP-SPDPM) for low-coherence snapshot quantitative phase imaging and videography. The system utilizes a Wollaston prism to separate two orthogonally linearly polarized beams, and a pinhole is used for the reference beam. By simultaneously acquiring four phase-shifted interferograms with a polarization camera, a high spatial resolution phase map is accurately retrieved. The WP-SPDPM is a powerful tool for accurate and robust quantitative phase measurement with a significant potential for real-time phase imaging.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Petr Zapletal, Tom Darras, Hanna Le Jeannic, Adrien Cavailles, Giovanni Guccione, Julien Laurat, Radim Filip
Summary: The research demonstrates that n independent imperfect single photons can ultimately bunch into the Fock state, introducing an experimental Fock-state bunching capability for single-photon sources. This operational approach, unlike autocorrelation functions, considers residual multi-photon components, vacuum admixture, and individual photon statistics' dispersion.
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)