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Single-layer waveguide with compound metasurfaces for highly efficient and chromatic-aberration-free augmented reality near-eye displays Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-11 Zhilin Sun, Shuzhan Yan, KangKang Chen, Zijian Lin, Yun Ye, Sheng Xu, Jie Sun, Qun Yan, Tailiang Guo, Enguo Chen
Augmented reality (AR) near-eye displays seamlessly integrate virtual information with real world, in which the optical waveguide is the key component functioned as a coupler. Due to strong chromatic aberration, independent waveguides are always indispensable to separate the three primary colors that inevitably brings larger and thicker appearance. To address this, this paper proposes a new chromatic-aberration-free
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Underwater 3D reconstruction based on double N-step orthogonal polarization state phase shift strategy Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-10 Zhenmin Zhu, Hongwei Qiu, Qiang Hu, Kang Ren, Lisheng Zhou, Taowei Zhu
The nonlinear response of projection equipment and the uneven reflectance of HDR (high dynamic range) object surface pose challenges in underwater 3D reconstruction. As a result, the phase-shifting fringe pattern collected by the camera does not have good sinusoidality, leading to phase errors. Therefore, this paper proposes a double N-step orthogonal polarization state phase-shift strategy (DOPS)
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A see-through combiner based on pixelated intertwined flat lens for full-color glasses-free augmented reality Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-10 Jiacheng Shi, Wen Qiao, Fengbin Zhou, Ming Yang, Linsen Chen
Augmented reality (AR) 3D display has attracted great interest in its ability to merge virtual 3D objects with physical scenes naturally without the aid of a wearable device. Here we propose a sizeable (20-inch) see-through combiner based on 2,073,600 pixelated intertwined multilevel diffractive lenses (IMDLs) for full-color glasses-free 3D display. The pixelated IMDLs discretely reconstruct converged
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Femtosecond laser shock peening Cu-Zn welds: Experiments and multi-scale modeling investigation Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-08 Zhiyuan Liu, Zheng Zhou, Bin Yang, Qingjun Hao, Bin Zhang, Yan Zhao, Cheng Lei, Du Wang
Laser shock peening of the weld surface is a cutting-edge treatment technology following welding. However, the conventional nanosecond pulsed lasers used for this process can unintentionally damage the weld surface quality due to secondary melting, which can reduce the comprehensive mechanical properties of the material. Here, we applied femtosecond laser shock peening (FLSP) to Cu-Zn welds as a paradigm
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Three-dimensional tracking of dynamic nanoparticles based on direct correlation method in fluorescence self-interference microscopy Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-08 Yuhong Wan, Lu Zhang, Tianlong Man, Zia Ali, Hongqiang Zhou
Single-molecule localization microscopy (SMLM) has been applied as a powerful tool in the visualization of biological samples. The obtained details about the fine structures inside the cells or tissues, on the spatial scale of much smaller than the size that defined by the diffraction limit of the optical system, are important for the understanding of the dynamics and organization of the living process
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Polarization-independent two-dimensional dielectric grating for 3 × 3 beam splitter Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-07 Xingxue Li, Jin Wang, Wei Jia, Changhe Zhou, Yongfang Xie, Shanwen Zhang
Conventional multi-port beam splitters with spot arrays, while being key components in diversiform optical systems, show polarization sensitivity and insufficient uniformity. Here, we proposed a polarization-independent high-efficiency 3 × 3 beam splitter based on the two-dimensional(2D) cylindrical dielectric grating (CDG), which could redistribute the incident light into nine beams with equal power
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An adaptive multi-scale point cloud filtering method for feature information retention Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-07 Zengwei Lian, Yiliu Gu, Keshun You, Xianfei Xie, Guangqi Qiu
Point cloud data is often accompanied by a large number of noise and outliers, to improve the quality of point cloud data, this paper proposes a multi-scale point cloud filtering method for feature information preservation. Firstly, a multi-scale division method with distance-weighted Principal Component Analysis (DWPCA) is proposed to divide the point cloud data into large-scale outlier regions and
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Non-Lambertian photometric stereo via neural inverse rendering and interreflection model Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-06 Yuze Yang, Jiahang Liu, Yangyu Fu, Yue Ni
Photometric stereo (PS) is an important method for 3D fine reconstruction of object surfaces, and nonlinear mapping is the main method for solving surface normals in photometric stereo. The PS models are generally established under the assumption that the object has a consistent surface material and a purely convex surface. However, real-world objects often have surfaces with spatially varying materials
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Microstructural characterization of biological tissues based on sequential Stokes polarization images during dehydration Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-06 Jiawei Song, Qiqi Fu, Nan Zeng, Hui Ma
Dehydration is an important mechanism in the process of tissue optical clearing, often accompanied by microstructural changes such as the decrease in scattering coefficient and thickness. In this paper, the dynamic process of tissue dehydration is taken as an example, and a method to extract tissue characteristics based on the regularity of the sequential polarization image as well as Monte Carlo (MC)
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Multi-view 3D data fusion and patching to reduce Shannon entropy in Robotic Vision Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-06 Oleg Sergiyenko, Ruben Alaniz-Plata, Wendy Flores-Fuentes, Julio C. Rodríguez-Quiñonez, Jesús E. Miranda-Vega, Cesar Sepulveda-Valdez, José A. Núñez-López, Marina Kolendovska, Vladimir Kartashov, Vera Tyrsa
Optical Sensors Fusion is intended to enrich the data obtained from Robotic Vision systems, which play a crucial role in applications such as machine guidance and monitoring. This paper presents a data augmentation method that uniquely combines cameras with the rotational wide-based Laser Scanner Technical Vision System (LSTVS), an innovative system not previously explored in conjunction with other
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Characterizing the measurement resolution and measurement bias of Sampling Moiré Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-05 Frédéric Sur, Benoît Blaysat, Michel Grédiac
Sampling moiré is a spatial fringe pattern analysis method which can be used to retrieve displacement fields on the surface of deformed specimens marked by a periodic pattern. We prove that, under mild assumptions, Sampling Moiré (SM) is equivalent to another full-field method, namely the Localized Spectrum Analysis (LSA). The prospects opened up by this result concern two metrological indicators,
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Efficient Micro-LED defect detection based on microscopic vision and deep learning Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-03 Meiyun Chen, Shuxin Han, Cheng Li
Defect detection is highly important in the production of Micro-LEDs. Micro-LEDs are characterized by their small size and high density, which leads to a variety of complex defects. Existing detection methods often fail to meet the accuracy and speed requirements of defect detection. To address these issues, we constructed an automatic microscopic vision-based detection system (MVDS) for capturing
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Michelson interferometer with Bessel beams Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-03 Wenlei Yu, Lei Jiang, Kehao Zeng, Xinyuan Jing, Yunfeng Jiang
Directly introducing Bessel beams into the Michelson interferometer could not generate effective interference pattern for both constructive case or destructive case. To overcome this difficulty, we separate the two Bessel beams with a special distance, making -th light ring of two Bessel beams partially overlapped in the center. In Bessel Michelson interferometer, the interference pattern changes between
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Performance improvement of blue thermally activated delayed fluorescence organic light emitting diodes via in-situ fabricated honeycomb porous polystyrene pattern Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-02 Yanqiong Zheng, Qingyu Zhang, Xuande Yang, Yuhuan Chen, Bingjia Zhao, Huadong Zheng, Xifeng Li, Ryota Kabe, Longlong Chen
“Breath figure” (BF) method is an efficient strategy for preparing regular, porous optical array. In the BF process, the condensed water droplets are uniformly distributed on the solution surface because of the capillary force. Under the surface tension the water droplets are aggregated into larger droplets. After they are evaporated, the self-organized close-packed hexagonal porous array is formed
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On-orbit calibration of space camera lens distortion using a single image Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-01 Gaopeng Zhang, Feng Wang, Guangdong Zhang, Zhe Zhang, Hubing Du, Zixin Zhao, Changqing Wang, Jianzhong Cao, Jingwei Zhao, Yanjie Li, Rong Lu
Since space cameras need to withstand the harsh mechanical and thermal conditions in the space environment for a long time, it is necessary to calibrate them in orbit. However, existing calibration methods have various disadvantages, making them impossible to use in orbit. To address this problem, we present an on-orbit calibration of space camera lens distortion with the vanishing points obtained
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Extraction of structured light stripes center from Non-uniform scattering surfaces fused with deep learning Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-01 Hao Du, Hui-Feng Wang, Yue-Yuan Guan, He Huang, Rong Gao, Xiao-Wei Zhang, Ke-Nan Mu, Yun-Mei Jiao
The non-uniform strongly scattering surface enormously influences the measurement accuracy of high-precision structured light Three-dimensional (3D) surface topography. Accurately extracting the central profile of non-uniform highly scattering surfaces is the basis for 3D measurement using point cloud data. In this paper, based on the analysis of the properties of structured light stripes on non-uniform
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Weyl semimetal assisted all-optical diode action based on a topological photonic crystal heterostructure Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-01 Samad Roshan Entezar
Here, we propose an all-optical diode device based on a topological photonic crystal heterostructure composed of two one-dimensional photonic crystals with a thin Weyl semimetal layer between them. An all-optical diode, a nonreciprocal device that allows perfect transmission in one direction and prohibits it in the opposite direction, is widely used in optical communication, all-optical signal processing
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3D reconstruction method based on polarization suppression of inter-reflection Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-01 Zhenmin Zhu, Yumeng Zhou, Tai Zhu, Dongdong Xie, Wenqing Long, Lifa He
The mutual reflection between objects has always been a difficult problem in three-dimensional shape measurement. In order to solve this problem, this paper proposes a three-dimensional reconstruction method based on polarization suppression mutual reflection. This method adds a polarization filter in front of each camera and projector. The fringe projection profilometry (FPP) is used for three-dimensional
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Optimization of single-beam multiple-intensity reconstruction technique: Select an appropriate diffraction distance Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-01 Jixin Jiang, Fanxing Li, Siyang Yu, Fan Yang, Jupu Yang, Jixiao Liu, Wei Yan, Jialin Du
The multi-distance phase retrieval technique is widely used in phase imaging due to its high accuracy, simple implementation, and strong robustness. However, the artificial selection of the diffraction distance for capturing images has been a limitation. This limitation has sparked the desire to improve the accuracy of multi-distance phase retrieval by either capturing more images at different diffraction
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Photoacoustic communication system based on detecting laser-generated sound by optical fiber underwater acoustic sensor Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-29 Yang Zhao, Yingnan Chen, Jinxin Huang, Zhiquan Zhou, Faxiang Zhang
The selection of photoacoustic conversion mechanism, modulation method, and underwater sound detection method is critical in solving the problem of Air-Water Cross-Medium Communication (AWCMC) based on laser-generated sound (LGS) technology. The primary objective of this work is to provide a photoacoustic system used for AWCMC based on a pulsed laser and a fiber optic hydro-acoustic sensor. The pulsed
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Tracking hydrodynamic disturbances with fibre-optic whiskers Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-29 Raphael Glick, Christoph Brücker, Matthias Fabian, Kenneth T.V. Grattan
Previous research has identified the capabilities of artificial whisker sensor arrays as an innovative method of tracking and evaluating flow events and disturbances. In this work, a new approach is put forward, focusing on achieving enhanced sensitivity and improved performance of fibre-optic whisker sensors, based on the principle of fibre Bragg Grating (FBG) based optical stress sensing. Its performance
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Improved terraced compression method combined with BIRCH algorithm for heterogeneity detection Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Meiling Fan, Gang Li, Yue Song, Ling Lin
Breast cancer screening based on multispectral transmission imaging has the advantages of being harmless and easy to implement. If combined with image processing means, automated breast heterogeneity detection can be realized, which will create great value. Due to the limitation of the amount of data as well as labeled data, it is not possible to use supervised learning methods for classification and
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Review on digital holography techniques using digital micromirror device Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Abhishek Rhisheekesan, Dennis Thomas, Vaishnav Raj K, Gadha T, Pradeep A. V, Jijo Pulickiyil Ulahannan, Sajeev Damodarakurup
This paper provides an in-depth exploration of holographic methodologies, focusing particularly on digital holography facilitated by Digital Micromirror Devices (DMD). We thoroughly examine the theoretical foundations of holographic capture and reconstruction, emphasizing the role of DMDs in these processes. The study covers the principles of diffraction that govern the interaction between light waves
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Highly sensitive refractometric sensing system based on the combination of lensing and laser speckle correlation Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Carlos Angulo Barrios
A simple optical sensing system based on laser speckle and lensing for monitoring refractive index variations of fluids is proposed and demonstrated. The fluid of interest is contained in a cylindrical glass vessel, which acts as an optical lens whose focal length depends on the refractive index of the fluid. Focal length variations imply optical wavefront alterations that are revealed through laser
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Development of a new intelligent instrument for visibility and turbulence meteorological environment parameters in traffic network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Qicheng Zhou, Changyuan Fan, Yong Han, Debin Su, Li Dong, Yurong Zhang
The number of transport network systems in the world is increasing and the transport network passes through different geographical environments, there is an urgent need to develop an environmental meteorological monitoring equipment for the transport network security. So, in this study, a new intelligent instrument for monitoring the visibility and turbulence meteorological environmental parameters
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Performance analysis of high-spectral-resolution lidar with/without laser seeding technique for measuring aerosol optical properties Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Fengjia Gao, Fei Gao, Gaipan Li, Fan Yang, Li Wang, Yuehui Song, Dengxin Hua, Samo Stanič
High-spectral-resolution lidar (HSRL) is a powerful tool for aerosol measurements. With/without laser seeding technique in the transmitted laser, the HSRL can be distinguished as the single-longitudinal-mode (SLM) HSRL or the multi-longitudinal-mode (MLM) HSRL, and the Mach-Zehnder interferometer (MZI) with periodic transmittance function can be used as the spectral discriminator in both the SLM HSRL
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The YOLO-based Multi-Pulse Lidar (YMPL) for target detection in hazy weather Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-28 Long Wu, Fuxiang Gong, Xu Yang, Lu Xu, Shuyu Chen, Yong Zhang, Jianlong Zhang, Chenghua Yang, Wei Zhang
As one of the essential sensing technologies for autonomous driving, Lidar has not been widely adopted due to the significant impact of foggy and hazy weather leading to inaccurate target detection and distance measurement. In this paper, a YOLO-based Multi-Pulse Lidar system (YMPL) is proposed for accurate target detection in foggy conditions. The system integrates multiple one-dimensional pulse detection
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Polarization singularity index determination using wedge plate lateral shear interferometry Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-27 Baby Komal, Rahul Joshi, Sunil Kumar, P. Senthilkumaran
Polarization singularity is a point in an inhomogeneous polarization distribution at which the azimuth of the polarization ellipse is indeterminate. The azimuth gradient is solenoidal around the polarization singular point. In metrology, shear interferometry enables the visualization of phase gradients in optical beams. Since the polarization azimuth gradient is related to the Stokes phase gradient
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Precision prediction of beacon center spot in atmospheric turbulent environments Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-27 Xuewei Wang, Ninghua Zhang, Qiang Wang, Lei Cui, Jing Ma
Atmospheric turbulence in the laser propagation path induces phase distortion and adversely affects the acquisition of the beacon spot center for satellite–ground laser links. We introduce an optical flow method to track multiple feature points and obtain the overall motion state of the light spot to predict the inter-frame offset and offset direction of the center position of the light spot. We combined
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Automatic optimization of projection intensity for high dynamic range 3D surface measurement Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-27 Renhao Zheng, Lijing Li, Maosen Wan, Wei Zhang, Liandong Yu
Stripe projection profilers are widely used in many fields because of their high speed, high accuracy, and clear surface textures. In the structured light projection method, the complex reflectance distribution on the surface of the high-dynamic-range objective is an important factor that affects the measurement accuracy, as it can result in image over- and under-exposure. In this study, a method is
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Cross-modality person re-identification based on intermediate modal generation Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-26 Jian Lu, Shasha Zhang, Mengdie Chen, Xiaogai Chen, Kaibing Zhang
In the context of cross-modal person re-identification, researchers often employ methods that utilize visible modality information to generate both an ‘X’ modality and a grayscale modality, enhancing the accuracy of person re-identification models. A lightweight network causes the ‘X’ modality through self-supervised learning of labels from visible images. In contrast, the grayscale modality is obtained
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High-resolution display screen as programmable illumination for Fourier ptychography Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-26 Kyungwon Lee, Kyung Chul Lee, Jaewoo Jung, Hyesuk Chae, Seung Ah Lee
We introduce a new programmable illumination strategy for Fourier ptychographic microscopy (FPM), utilizing a high-resolution organic light-emitting diode (OLED) display screen at the vicinity of the sample to achieve super-resolution and quantitative phase imaging of biological samples. High-density pixels in the OLED screen allow for the angle-scanning illumination required for FP by placing the
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Concurrent M-QAM transmission performance assessment in a combined four SOA-MZIs arrangement Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-24 Hassan Termos, Ali Mansour
In this paper, the utilization of four semiconductor optical amplifier Mach-Zehnder interferometers (SOA-MZIs) is explored to achieve concurrent M-QAM (M-ary Quadrature Amplitude Modulation) transmission. Utilizing an actively mode-locked laser, we generate pulses with a duration of 0.5 ps at a repetition rate of 20 GHz, serving as our sampling source. The incoming M-QAM signals, spanning various frequencies
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Finding the optimal concentration of scattering media for intra-peritoneal photodynamic therapy for peritoneal carcinomatosis Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-24 Jong-Hyun Park, Jaehyuk Kim, Sung-Ho Lee, Jae Eun Yu, Yoon-Kyu Song, Hyoung-Il Kim
Photodynamic therapy (PDT), which exerts its effects through the coexistence of light, photosensitizer, and oxygen, has emerged as a promising clinical therapeutic tool for cancer treatment. An even distribution of light energy is a prerequisite for the safe and effective treatment of peritoneal carcinomatosis. To overcome unpredictable light delivery to the irregular surface, we used light dosimetry
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Design of a three-channel pixelated phase mask and single-frame phase extraction technique Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-24 Siqi Wang, Ailing Tian, Bingcai Liu, Hongjun Wang, Xueliang Zhu, Yahui Zhu, Kai Wang, Kexin Ren, Yuwen Zhang
The pixelated phase mask (PPM) is a crucial component of the division-of-focal-plane (DoFP)-type polarization camera that is commonly used in simultaneous phase-shift interferometry. However, the traditional PPM has room for improvement in terms of the sampling rate and redundant channel information utilization due to its fixed layout and angle selection. In this work, a three-channel pixelated phase
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Magnetic toroidal dipole resonance terahertz wave biosensor based on all-silicon metasurface Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-23 Fuyi Cui, Xin Huang, Qiaoyi Zhou, Yijie Tong, Fuihai Liu, Ying Tang, Xiangru Meng, Chenxia Li, Bo Fang, Xufeng Jing
Optical sensing is crucial in many applications and has received widespread attention in recent years. Transmission spectroscopy with narrow linewidth resonances is indispensable for improving metasurface sensing performance. However, the narrower linewidth results in a smaller resonant modulation range, which seriously hinders the application of metasurfaces in sensing detection. We designed an all-silicon
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Dual fusion network for semantic segmentation of point clouds Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-22 Jian Lu, Huihui Guo, Xurui Jia, Jiatong Wu, Xiaogai Chen
The current networks for point cloud segmentation fail to fully consider the connections between points in each neighborhood, which makes the final segmentation capability underperform. To obtain richer local relationships between points, this paper proposes a network called GDFNet (Graph Convolution-based Dual Fusion Network), which dynamically mines the correlations between points in each layer of
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Air-puff induced corneal dynamics in normal, forme fruste and keratoconic eyes measured with OCT-based optical biometry Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-22 Patryk Mlyniuk, Ewa Maczynska-Walkowiak, Jagoda Rzeszewska-Zamiara, Alfonso Jimenez-Villar, Bartlomiej J. Kaluzny, Ireneusz Grulkowski
The aim of this study was to characterize corneal dynamic response in normal subjects (NL), patients with forme fruste keratoconus (FFKC) and patients with clinical keratoconus (KC) using air-puff OCT-based optical biometry. This cross-sectional study included 50 normal eyes (NL), 15 forme fruste eyes (FFKC) and 31 eyes with early and moderate keratoconus (KC). Keratometry and pachymetry were performed
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Computational label-free microscope through a custom-built high-throughput objective lens and Fourier ptychography Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-20 Chen Liang, Fan Feng, Ke Du, Dongdong Chen, Runjia Yang, Chang Lu, Shumin Chen, Jianzhong Jeff Xi, Heng Mao
Label-free microscopy directly images live samples without fluorescent markers, providing a panoramic view of biological structures and functions. However, pursuing high-throughput and high-content live cell imaging requires both higher spatial resolution and larger field of view, which are limited by the optical system. In this study, we custom-built a 5▪/0.35 objective with a field number of 28 mm
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The SOLUS instrument: Optical characterization of the first hand-held probe for multimodal imaging (ultrasound and multi-wavelength time-resolved diffuse optical tomography) Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-16 Giulia Maffeis, Laura Di Sieno, Alberto Dalla Mora, Antonio Pifferi, Alberto Tosi, Enrico Conca, Andrea Giudice, Alessandro Ruggeri, Simone Tisa, Alexander Flocke, Bogdan Rosinski, Jean-Marc Dinten, Mathieu Perriollat, Jonathan Lavaud, Simon Arridge, Giuseppe Di Sciacca, Andrea Farina, Pietro Panizza, Elena Venturini, Peter Gordebeke, Paola Taroni
SOLUS is a multimodal imaging system comprising the first miniaturized handheld device to perform time domain Diffuse Optical Tomography at 8 visible and near infrared wavelengths. The hand-held probe also includes B-mode ultrasounds, Shear Wave Elastography and Color Doppler sonography, being its first goal the multiparametric non-invasive diagnosis of breast cancer. This work aims at presenting the
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Anti-noise light field depth measurement using specular highlight removal Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-15 Wei Wu, Longxu Jin, Biao Qi, Guoning Li, Jin Li
Due to their ability to simultaneously record spatial and angular information about the scene within a single shot, light field cameras have a distinct edge in depth measurement. Both specular highlight and noise make it difficult to measure the depth of the light field. To address this problem, we propose an alpha hybrid method based on the dichromatic reflection model (DRM) and scene prior to remove
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Design and fabrication of a compact coaxial catadioptric augmented reality near-eye display enabled by genetic algorithm Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-15 Yang Li, Dewen Cheng, Yilun Huang, Qichao Hou, Yongtian Wang
The way we interact with the world is constantly evolving thanks to developments in virtual reality (VR) and augmented reality (AR) technologies. AR has been extensively employed in a variety of fields and is one of the metaverse's key interfaces. It has always been difficult to develop and process an optical see-through (OST) AR with a wide field of view (FOV) that is also compact, lightweight, and
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In-situ capture of melt pool signature in high-speed laser cladding using fully convolutional network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-15 Shirui Guo, Yinyin Liu, Lujun Cui, Yinghao Cui, Xiaolei Li, Yongqian Chen, Bo Zheng
High-speed laser cladding is a promising additive manufacturing technology, and the quality of cladding forming is closely related to the forming state of the melt pool. The result of melt pool segmentation is the key to understand the dynamics of the melt pool, and the feature segmentation of the melt pool can provide an effective basis for the subsequent quality diagnosis and real-time feedback control
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AFM-NSOM Nano-Polarimeter: Wide-ranging sensing device for synchronized scanning Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-15 Yair Zigman, Binyamin Kusnetz, Jeremy Belhassen, Avi Karsenty
3D tip model with four rectangle apertures. (a) Schematic top view; (b) simulation top view for an illumination polarized in the x direction. The rectangle with its longer side perpendicular to the direction of polarization transmits the greatest amount of light, whereas the one whose longer side is parallel transmits a minimum. Unit: V/m. (c) Top view of the cylinder model with four rectangles apertures;
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A divided difference filter-based phase unwrapping method Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-14 Xie Xianming, Li Rong, Luo Guoping, Gao Xi, Wang Guofu, Hou Guozheng, Jia Jinguo, Tian Chongxiao
A divided difference filter-based phase unwrapping method was presented for restoring true unwrapped phases from interferograms composed of measured wrapped phases. Firstly, a divided difference filter (DDF) was utilized into the field of phase unwrapping (PU) for wrapped fringe patterns, and was combined with a local phase gradient estimation technique to build a DDF-based PU procedure. Secondly,
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Near-field analysis of the high-power laser facility using calculated methods and a residual convolutional neural network with attention mechanism Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Wei Chen, Wei Fan, Lin Yang, Xinghua Lu, Yujia Zhang
High-power solid-state laser facilities for Inertial confinement fusion impose very stringent requirements on the near-field distribution during operation. We propose calculated methods in space domain, including Otsu, adaptive rotation, cropping and numerical calculation to automatically process high power-laser near-field images from a large number of different status. These methods are applied to
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Reconstruction efficiency enhancement of amplitude-type holograms by using Single-Scale Retinex algorithm Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Lu Rong, Shi-Hang Zhang, Meng-Fan Yin, Dayong Wang, Jie Zhao, Yunxin Wang, Shu-Feng Lin
A real-value encoding hologram method for loading on amplitude-type spatial light modulator is proposed based on the single-scale retinex algorithm, in which the proportion of the low- and high-frequency components of the hologram can be controlled based on the center surround function. The fringe contrast of the hologram is enhanced by increasing the high-frequency and decreasing the low-frequency
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Tabletop ptychographic imaging system with a 515 nm laser driven high-order harmonic source Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Kui Li, Huixiang Lin, Jin Niu, Hao Xu, Yutong Wang, Changjun Ke, Xiaoshi Zhang, Fucai Zhang, Jie Li, Zhongwei Fan
We have developed a high-throughput, tabletop ptychographic imaging system based on a high-order harmonic, extreme ultraviolet (EUV) light source. Driven by a 1.8 W, 180 fs, 4 kHz, 515 nm femtosecond laser, three neighboring high-order harmonics centered around 46.8 nm is obtained with a total power of 43 μW. Utilizing the light source without any monochromatization, we conducted multi-wavelength ptychography
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Measurement of convective heat transfer coefficient and the Nusselt number by moiré deflectometry technique Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Sara Vosough Yazdani, Khosro Madanipour, Mohammad Ahmadi
In this paper Moiré deflectometry method has been used for measuring the refractive index profile, temperature distribution, convective heat transfer coefficient, and Nusselt number near a vertically mounted, heated metal plate. The density and refractive index of the air neighboring the hotplate is changed by convection flow. Its behavior is similar to that of a phase object. Moiré deflectometry is
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Fast point-based hologram generation method using high-frequency information extraction Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Qian Huang, Ye-Hao Hou, Fan-Chuan Lin, Zhao-Song Li, Min-Yang He, Di Wang, Qiong-Hua Wang
Computer-generated hologram based holographic 3D display is an important development direction of holographic 3D display. However, the heavy amount of calculation affects the generation speed of the holograms, which limits the further development of real-time holographic 3D display. In this paper, a fast point-based hologram generation method using high-frequency (HF) information extraction is proposed
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High-speed road sign detection scheme based on ultrafast single-pixel scanning LiDAR Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Ai Liu, Peng Cai, Jiajun Zhang, Bowen Wang, Lele Hao, Qiang Wu, Yuansong Ying, Daqiu Zhou, Lei Gao
High-speed light detection and ranging (LiDAR) is of great significance for road sign detection in the vehicle travel process, and ultimately for futuristic automatic driving. The current vehicle-borne LiDAR techniques, such as optical phased array radar and solid-state LiDAR, are challenging in assisting fully automated driving, due to its limitation of slow responsibility. Here, we propose a high-speed
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Binocular near-eye augmented reality enabled by full utilization of functional computer generated hologram Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-13 Xiaoming Huang, Yongle Zhou, Haowen Liang, Jianying Zhou
A novel scheme is proposed for constructing binocular near-eye displays for augmented reality (AR) using the Maxwellian view and computer-generated hologram technology. The aim is to provide parallax holographic images with a large depth of focus for both eyes. This is achieved by employing a phase-only spatial light modulator to generate two holographic axicon phases. By utilizing the proposed holographic
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Double acousto-optic spectral filtering in off-axis multi-wavelength digital holography Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-12 Olga Polschikova, Alexey Gorevoy, Alexander Machikhin
Multi-wavelength digital holography (MDH) is a label-free technique for mapping spectral and spatial properties of samples in scientific and industrial applications. Light sources for MDH often include acousto-optic tunable filters (AOTFs) for sequential or simultaneous selection of narrow spectral bands in broadband radiation. We theoretically and experimentally evaluated the influence of the spectral
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Corrigendum to “Talbot wavefront sensor measurement possibilities under Gaussian illumination” [Opt. Lasers Eng. 169 (2023) 107718] Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-12 Myhailo M. Kotov, Volodymyr P. Danko, Andrii O. Goloborodko
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Laser differential confocal interference surface automatic measurement method Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-10 Jiahao Zhao, Dezhi Zheng, Shuai Yang, Shuai Wang, Zheng Yang, Jian Cui, Lirong Qiu, Weiqian Zhao
Considering the low accuracy, slow speed and small adjustment range of measuring an object with a spherical surface using traditional interferometry owing to adjusting the posture of the object, an automatic laser differential confocal interferometric measurement method is proposed to measure the surface shapes, which achieves the high-precision confocal axial positioning of the measured object through
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Omnidirectional near-infrared narrowband filters based on defective mirror-symmetry one-dimensional photonic crystals containing hyperbolic metamaterials Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-10 Shan Li, Guang Feng, Yichao Liu, Min Wu, Xiaodan Zhao, Fei Sun, Zhixing Gan, Zhihui Chen, Yibiao Yang
The photonic band gap (PBG) of conventional all-dielectric one-dimension (1D) photonic crystal (PC) shifts towards the shorter wavelength (blueshift) as the incident angle increases, thus the defect mode in conventional defective all-dielectric 1DPC is also blueshifted. This leads to many limitations on the performance of the narrowband filtering. Recently, the emergence of the redshift PBG in 1DPC
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Tunable optofluidic Fresnel lens with ring-shaped electrodes Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-09 You-Ran Zhao, Jin-Bo Xu, Rong-Ying Yuan, Xin Wang, Lei Li, Chao Liu, Qiong-Hua Wang
Traditional Fresnel lenses can achieve volume diminution by reducing lens material cost, thereby achieving further integration in optical systems. However, the solid Fresnel lenses in being are fixed once they are fabricated due to the limitation of materials, so their optical parameters, like focal length, cannot change. In this paper, we propose a ring-shaped tunable optofluidic Fresnel lens (OFL)
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One-dimensional modulation single-pixel imaging: Exceeding spatial light modulator resolution Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-08 Mengchao Ma, Yi Gao, Jieting Hou, Xiang Zhong, Dongfeng Shi, Yingjian Wang, Huaxia Deng, Xuming Zhang
Although high-resolution single-pixel imaging (SPI) can be achieved by under-sampling, low sampling ratio (SR) strategies often result in a loss of image details and lower image quality. Due to the limited memory of the spatial light modulator (SLM) and the time necessary to load such vast numbers of patterns, high-resolution SPI at high sampling rates has not yet been realized. In this work, we propose
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THz time-domain spectral imaging enhancement based on an MLP-SRCNN composite network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-08 Delin Liu, Haonan Zhao, Baitong Chen, Zhiyong Wang
A enhancement algorithm for scanning images from terahertz time domain spectral system is proposed. The algorithm is a machine learning algorithm based on a multi-layer perceptron (MLP) network and a super-resolution convolutional neural network (SRCNN). The MLP network is utilized to convert a time domain waveform vector into a scalar pixel intensity adaptively; the SRCNN network aims to achieve the
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Feature extraction and robot path planning method in 3D vision-guided welding for multi-blade wheel structures Opt. Laser Eng. (IF 4.6) Pub Date : 2024-02-08 Yuankai Zhang, Yusen Geng, Xincheng Tian, Lelai Zhou
Multi-blade wheel structures are essential components in many industrial and mechanical systems. Substituting manual welding with robot welding can significantly enhance processing efficiency for them. However, robotic welding requires complex teaching and programming to plan paths. This is not conducive to the improvement of welding efficiency. To address this issue, this paper establishes a welding