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Adaptive image thresholding and localization of point spread functions with enhanced precision for single molecule localization based super-resolution microscopy Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-16 Pranjal Choudhury, Bosanta R. Boruah
Super-resolution microscopy techniques such as single molecule localization microscopy (SMLM), have revolutionized nanoscale imaging of biological specimens. Accurate detection of the point spread function (PSF) via an appropriate thresholding is pivotal for SMLM, to ensure precise fluorophore localization and, consequently, super-resolved image reconstruction. In this research, we introduce a novel
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A novel high efficiency narrow-gap laser welding technology of 120 mm high-strength steel Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-15 Zhen Lei, Hao Cao, Xiufang Cui, Yiming Ma, Lin Li, Qing Zhang
Porosity, incomplete fusion, and solidification cracks are frequently encountered defects in narrow gap laser welding. How to effectively inhibit welding defects while significantly improving welding efficiency has become the key technical challenge of narrow gap laser welding. In this paper, a new method of high-efficiency narrow gap dual-beam laser welding utilizing laser plume energy radiation to
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One-dimensional temperature measurement of gases based on femtosecond laser-extended electrode discharge spectroscopy (FEEDS) Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-12 Zhanyu Feng, Lei Han, Qiang Gao, Zihan Liu, Bo Li
Temperature, and hence thermometry techniques, are critical for characterizing gaseous flows and flames. Therefore, it is always attractive to develop new thermometry techniques to satisfy different demands. Here, we propose a thermometry technique for one-dimensional gas temperature measurements based on femtosecond laser-extended electrode discharge spectroscopy (FEEDS). By FEEDS measurements in
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High-speed photoelastic tomography for axisymmetric stress fields in a soft material: Temporal evolution of all stress components Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-12 Yuto Yokoyama, Sayaka Ichihara, Yoshiyuki Tagawa
This study presents a novel approach for reconstructing all stress components of the dynamic axisymmetric fields of a soft material using photoelastic tomography (PT) and a high-speed polarization camera. This study focuses on static and dynamic Hertzian contact as an example of transient stress field reconstructions. For the static Hertzian contact (a solid sphere pressed against a gel block), all
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Monitoring the dynamics of cultured tobacco cells division by TIE-based 3D fluorescence microscopy with two-synchronized image sensors Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-11 Manoj Kumar, Yasuhiro Awatsuji, Takashi Murata, Osamu Matoba
The dynamic activity of the microtubule cytoskeleton is critical to cellular organization, including structural support, intracellular transport, and engagement in processes such as cell division and cell motility. In this work, we monitor the volumetric cell division process of tobacco BY-2 suspension cells including the dynamics of microtubule in a single-shot by using a 3D epi-fluorescence microscope
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Research on rapid and high-sensitivity ellipsometry employing multi-harmonic terms of dual cascade photoelastic modulators Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-10 Kewu Li, Shuang Wang, Liming Wang, Shiwei Deng, Zhibin Wang
In the fields of film coating, microelectronics, biosensing, and nanomaterial characterization, there is a growing demand for rapid and highly sensitive ellipsometry. Photoelastic modulation ellipsometry has emerged as a method capable of achieving unparalleled measurement speeds and sensitivities. However, the performance of this ellipsometry technique is contingent upon the precise calibration and
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Revealing the preference for correcting separated aberrations in joint optic-image design Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-09 Jingwen Zhou, Shiqi Chen, Zheng Ren, Wenguan Zhang, Jiapu Yan, Huajun Feng, Qi Li, Yueting Chen
The joint design of the optical system and the downstream algorithm is a challenging and promising task. Due to the demand for balancing the global optima of imaging systems and the computational cost of physical simulation, existing methods cannot achieve efficient joint design of complex systems such as smartphones and drones. In this work, starting from the perspective of the optical design, we
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Sensitive, calibration-free and multi-channel wavelength scanning spectroscopy based on free-running laser frequency comb with Gaussian process regression algorithm for gas sensing Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-09 Zhiwei Liu, Gangyun Guan, Hongda Chen, Junqiu Long, Xuyang Wu, Guofeng Yan, Chuantao Zheng
A new kind of wavelength scanning spectroscopy was proposed and demonstrated, based on a free-running fiber laser frequency comb centered at 1560 nm with bandwidth of 25 nm working as a highly coherent broadband light source. A phase-shifted fiber Bragg grating (PS-FBG) was used with a tunable filter to form an ultra-narrow-bandwidth transmission module and to generate narrow-linewidth probe light
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Athermalization of infrared annular folded lens based on wavefront coding Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-09 Dechao Ma, Mingxu Piao, Yuanming Zhao, Bo Zhang, Chengran Zhang, Zhe Wang
The annular folded lens (AFL) achieves miniaturization and integration of optical systems by single-element design. When over a wide temperature range, the AFL cannot be athermalized with one substrate material. In order to reduce the impact of temperature on imaging quality of the AFL, wavefront coding (WFC) technology is introduced. The WFC-AFL design principle is studied, the relationship between
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Depth-resolved stress field measurement of multilayered system using swept-source polarization-sensitive optical coherence tomography Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-09 Xinya Zhang, Jinlong Chen, Cuiru Sun
Non-destructive, layer-resolved stress field measurements of multilayered systems are essential for structural optimization, mechanical property induction and product inspection. This paper presents a depth-resolved stress field measurement method for multilayered systems based on swept-source polarization-sensitive optical coherence tomography (SS-PS-OCT). A circularly polarization state (CPS) SS-PS-OCT
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Optimization of depth of field and enhancement of viewing angle in three-dimensional light field fusion display system based on the design of aspherical symmetric compound lens Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-08 Xiangyu Pei, Xunbo Yu, Gao Xin, Bangshao Fu, Xinhui Xie, Haoxiang Dong, Xinzhu Sang, Binbin Yan
The three-dimensional (3D) light field fusion display system based on flat panel light field display (LFD) can effectively expand the depth of field (DOF) of the LFD. However, its viewing angle is narrow, which makes it difficult to reconstruct more comprehensive information of the 3D scene. In addition, the crosstalk caused by the aberration of the light control element used in the system causes aliasing
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Dense viewpoint encoding of 3D light fields based on neural graphics primitives Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-06 Chaoqun Ma, Jing Liu, Wenyu Xu, Zhiqiang Shi, Haiyang Yu, Zhuo Chen, Changpei Ma, Xiaoyu Jiang
The enormous rendering time is a challenge for generating the Projector Image Array (PIA) using parallax images. Based on Neural Radiance Fields (NeRF), a novel method for directly rendering sub-images of PIA is proposed to accelerate light field encoding. The method is a unique combination of 3D light field coding and recent instant Neural Graphics Primitives (NGP) technique, showing how to obtain
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Design, characterization, and implementation of Diffuse Reflectance Integrating Ellipsoids (DRIE) for spectroscopic analysis Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-06 Martin Torres-Vargas, Naara González-Viveros, Mario Pérez-Cortez, Perla García-Flores, Jorge Castro-Ramos
Integrating ellipsoids in diffuse reflectance spectroscopy is unusual; few are constructed in just one piece. In diffuse reflectance spectroscopy, integrating spheres are used to determine the optical properties of biological tissues in diagnosis or disease detection. The disadvantages of using integrating spheres in the biological field lie in the dimensions of their apertures, which, being small
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Polarization-frequency synergetic multiplexing terahertz metasurface Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 Shaohe Li, Yan Wang, Runfeng Su, Hui Wang, Xuecou Tu, Jingbo Wu, Caihong Zhang, Biaobing Jin, Huabing Wang, Jian Chen, Peiheng Wu
Multiplexing technology, especially electromagnetic (EM) wave multiplexing is recognized as a highly effective solution for addressing the escalating demands in high-capacity information processing and communication. Nevertheless, it is yet extremely challenging for multiplexed meta-devices, as most of them could only modulate a single degree of freedom (DoF) of EM waves. In this work, a polarization-frequency
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Application of Deep Learning on Structure Displacement Measurement and Accuracy Analysis Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 Haifeng Wen, Ruikun Dong, Peize Dong
Displacement serves as a crucial indicator in structural health monitoring within civil engineering, with computer vision being a commonly employed tool due to its cost-effectiveness and convenience. This paper introduces a methodology for tracking feature points computed via computer vision techniques SuperPoint and SuperGlue. Two test scenarios are conducted: a bridge loading test characterized by
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Variable-frequency phase-shifting algorithm with least-squares iteration for hybrid errors reduction under structured-light illumination Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 Junxue Wang, Suodong Ma, Chinhua Wang, Donglin Pu, Xianmeng Shen
In this paper, a novel variable-frequency phase-shifting algorithm is proposed to reduce hybrid errors under structured-light illumination, which combines a least-squares iteration with regularization processing. Theoretical formulas and related calculation techniques for the variable-frequency fringe model are respectively derived and proposed considering phase-shifting errors, temporal intensity
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Extended wavefront reconstruction for quadri-wave lateral shearing interferometry Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 In-Ung Song, Jae-Hyuck Choi, Hyug-Gyo Rhee, Hagyong Kihm, Ho-Soon Yang
Quadriwave lateral shearing interferometry (QWLSI) is a well-defined and robust wavefront sensing technique used in various fields such as laser beam qualification, lens or surface testing, bio-imaging, and other advanced optical systems. Despite its strengths, a notable limitation is its inability to measure the edges of the optics because of the non-interfering region in the shearing structure. We
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All-optical active sensing platform for continuous and sustainable soil water content monitoring Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 Gaia Maria Berruti, Marco Leone, Patrizio Vaiano, Giovanni Vito Persiano, Marco Consales, Andrea Cusano
The determination of the amount of moisture in soil is crucial in several application fields such as agricultural, geotechnical, hydrological, and environmental engineering. In this paper, we propose the use of an advanced all-optical self-heated sensing platform for highly sensitive and repeatable monitoring of the soil volumetric water content (VWC). The proposed platform is realized by integrating
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MD-YOLO: Surface Defect Detector for Industrial Complex Environments Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-04 Hongxin Zheng, Xiaoxin Chen, Hao Cheng, Yixian Du, Zhansi Jiang
Computer vision inspection techniques are currently being effectively used in industry with positive outcomes. Due to flaws in the manufacturing process and the interference of outside factors, surface defect detection still faces numerous challenges in realistic and complex industrial settings, including wide variation in defect scales, small differences between defect imaging and background, low
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Single shot interferenceless coded aperture correlation holography via a learnable Wiener deconvolution network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-03 Le Yang, Junpeng Yang, Huiyang Wang, Yuheng Wang, Tao Huang, Weina Zhang, Jianglei Di, Liyun Zhong
One of the challenges in interferenceless coded aperture correlation holography (I-COACH) is high-quality single-shot reconstruction, as conventional cross-correlation reconstruction algorithm requires recording multiple holograms and complex reconstruction operations, resulting in serious background noise. Here, we present a deep learning based single-shot reconstruction by introducing a learnable
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Bidirectional phase retrieval: Protecting the imaging of cells and tissues from interference of noise on the carrier Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-03 Jixin Jiang, Fanxing Li, Siyang Yu, Fan Yang, Jian Wang, Qingrong Chen, Xi Zhang, Si Sun, Wei Yan, Jialin Du
Quantitative phase imaging plays a crucial role in biological imaging, with many phase retrieval technologies being particularly important. However, cells and tissues must be placed on certain carriers during imaging, such as glass slides, cell culture dishes, and cell culture boxes. Therefore, current unidirectional phase retrieval technologies are not suitable for biplane samples, causing the phase
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Rotational Doppler effect of vortex beam with frequency-shifted laser feedback Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-02 Ziyu Hua, Yifan Wang, Qing Wang, Shiyao Fu, Yidong Tan
We propose and demonstrate a rotational Doppler measurement system based on frequency-shifted laser feedback interferometry. The system utilizes a vortex beam as the probe, which is modulated by the target and then reflected back into the laser cavity. Compared with the conventional rotational Doppler methods, this approach effectively enhances the amplitude of the generated beat signal through intra-cavity
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Bioinspired photonic crystal structures from Papilio Ulysses butterfly wings for versatile laser applications Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-02 Shih-Wen Chen, Bing-Yi Hung, Sergei Piskunov, Jia-Han Li, Tzu-Chau Lin, Ja-Hon Lin
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Automated extraction of tunnel leakage location and area from 3D laser scanning point clouds Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-01 Pei Li, Qiusheng Wang, Jiahao Li, Ying Pei, Peng He
Water leakage is one of the common tunnel disease problems. Fast and accurate detection is crucial for timely management of leakage disease. This paper introduces a method for automatically extracting the location and area of tunnel leakage from 3D laser scanning point clouds. The method involves three key steps: segmenting the point cloud data along the tunnel axis based on the width of the tube sheet
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Hybrid periodic microstructures fabricated on chromium films by SLM-assisted nanosecond laser processing Opt. Laser Eng. (IF 4.6) Pub Date : 2024-04-01 Yuhao Zhou, Ruihao Li, Shiting Liu, Shaoji Jiang, Min Huang
An effective technique for preparing different hybrid periodic structures on chromium (Cr) films of different thicknesses using a 1064-nm nanosecond laser assisted by spatial light modulator (SLM) is proposed. For 1000-nm Cr films, by combining periodic modulated grating (MG) patterned by SLM with laser-induced periodic surface structures (LIPSS), regular dual-scale MG-LIPSS can be fabricated, with
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Flame soot absorption coefficient and temperature reconstruction through line-of-sight attenuation and light field imaging Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-30 Tianxiang Ling, Guoqing Chen, Md. Moinul Hossain, Qi Qi, Biao Zhang, Chuanlong Xu
The accuracy and efficiency of 3-D flame temperature field reconstruction using the light field imaging technique heavily depend on soot radiation characteristics. In this study, we employ the line-of-sight attenuation method to reconstruct the soot absorption coefficient distribution in a pure absorbing flame. Utilizing these soot absorption coefficients, the radiative transfer equation is effectively
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Imaging of human corneoscleral junction (Limbus) vasculature with 100 KHz A-scan rate swept-source optical coherence tomography/angiography (OCT/A) system Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-29 Raju Poddar, Abhishek Banerjee
The study demonstrates three-dimensional depth-resolved Optical Coherence Tomography Angiography (OCTA) and Doppler OCT imaging performed on the anterior segment of the human eye. A high-speed swept-source OCT system was developed utilizing a swept-source laser having a 100 kHz A-scan sweep rate and centre wavelength at 1060 nm. The proposed system has an axial resolution of 4.5 µm and a transverse
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High precision rail surface obstacle detection algorithm based on 3D imaging LiDAR Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-28 Guoan Zhu, Zongliang Nan, Xu Zhang, Yingying Yang, Xiaoqi Liu, Xuechun Lin
Railway perimeter intrusion detection is of great significance for ensuring railway safety operations. In this paper, a Light Detection and Ranging (LiDAR) system is designed and developed based on the specific environmental requirements of railway applications. The system is capable of autonomously adjusting the imaging range and angular resolution, enabling high-precision imaging within a 50 m monitoring
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Beam tracking of a five-dimensional processing system with independent control of laser spatial dimensions based on the vector method Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-28 Kailin Li, Wanqin Zhao, Wenqiang Duan, Tao Sun, Ningwei Bai, Xuesong Mei
Currently, microscopic inverted conical holes, grooves, and other structures with inverted cone angles are increasingly being utilized in aerospace equipment, medical devices, and other components. To meet the processing needs of such complex special-shaped microstructures, a novel laser processing system is developed which utilizing the complex differentiation, while relatively independent optical
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TV-based phase retrieval for speckle coded diffraction imaging Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Xining Yu, Ming Zhao, Sen Wang, Zhiming Tian, Yang Yang
Speckle coded diffraction imaging (SCDI) has emerged as a new and developing lensless imaging method, which provides an effective imaging method for dense and connected objects. The conventional alternating-projection-based phase retrieval algorithm for SCDI relies on phase constraints between multiple diffraction images, and its disadvantage is that it often necessitates a large number of measurements
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A dual-stage correction approach for high-precision phase-shifter in Fizeau interferometers Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Tao Xu, Ziqi Wang, Zhiwei Jia, Jian Chen, ZhiHua Feng
This paper proposes a dual-stage correction approach for a high-accuracy phase-shifter in Fizeau laser interferometers, effectively reducing the phase shift errors in PSI (Phase-Shifting interferometry) and improving the precision of surface profile measurements. The precision of PSI depends on the displacement accuracy of the reference mirror, and the function of the phase shifter is to drive the
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Definition of spectrum by colors metamerism using images of plants by ordinary camera Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Shiping Ye, O. Nedzved, A. Nedzved, Chaoxiang Chen
In several cases, studying biological objects requires spectral analysis to conduct research. Determination of a spectrum from RGB image data is a highly complex task because image color is formed by mixing colors. The inverse transformation of RGB color-to-spectrum does not have a unique solution. Consequently, this paper proposes an approach based on color deconvolution usage. RGB values are determined
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End-to-end infrared radiation sensing technique based on holography-guided visual attention network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Yingying Zhai, Haochong Huang, Dexin Sun, Spozmai Panezai, Zijian Li, Kunfeng Qiu, Mingxia Li, Zhiyuan Zheng, Zili Zhang
Infrared radiation imaging is extensively utilized due to its unique advantages in terms of wavelengths. This paper presents an end-to-end short-wave infrared digital holography system at 1550 nm that integrates hardware and algorithms to reconstruct targets in a lens-free system. To address challenges such as inherent noise, twin image, and proper focusing encountered in traditional holographic process
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High refractive index chalcogenide polymer-based planar refractive microlens components Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Feng Liu, Jiawei Zhang, Zhaojin Guo, Liang Zhou, Xianda Li, Xiaowei Lei, Ruonan Ji, Jiwei Zhang, Peng Li, Sheng Liu, Xiangping Zhu, Jianlin Zhao
Planar microlens components are highly desired in micro-systems for their compactness and ability to integrate with other planar elements. In this paper, we propose an alternative facile approach to producing positive planar microlens components by infilling concave microlens featured glass encapsulation with high refractive index chalcogenide polymer. The presented refractive microlens components
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A method for obtaining the full field of view Mueller matrix of optical systems by fitting the Orientation Zernike Polynomial parameters Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-27 Chunming Jiang, Dong Yao, Honghai Shen, Feifan Shi
Polarization imaging technology expands the dimensions of the object and enriches its basic information compared to traditional imaging methods. During the imaging process, the polarization information of the object is changed by the aberration of the optical system, which affects the detection accuracy. In this article, we analyzed the Cassegrain system and the double Gaussian system. By using the
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Super-resolution based number-theoretical phase unwrapping method applicable to 2D spiral fringe patterns Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-26 Hanjin Cho, Siwoo Lee, Yoonchan Jeong, Byoungho Lee
Spiral interferometry is a technique that accurately measures changes in 3D structures or refractive indices by converting phase changes into spiral fringe patterns. The spiral fringe patterns consist of phase distributions, which are wrapped from 0 to 2, requiring phase unwrapping techniques. Phase unwrapping transforms a discontinuous phase image from 0 to 2 into a continuous phase image, which can
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Enhancing angular resolution in single-photon LIDAR for daytime long-range 3D imaging Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-26 Yun Jiang, Bo Liu, Rui Wang, Yang Chen, Zhen Chen, Bin Zhao, Guangmeng Guo, Ling Wang, Lan Luo, Wenkai Li, Fengyun Huang, Yuqiang Yang
Single photon LIDAR exhibits exceptional detection sensitivity and finds extensive applications in long-distance measurement and three-dimensional imaging domains. However, it is susceptible to background noise interference, leading to a trade-off between scanning imaging efficiency and angular resolution, thereby limiting its overall performance. In this paper, we propose a novel ‘compression-resampling’
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ALI: The adaptive levels of interval method for processing laser speckle images with superior activity extraction and discrimination capabilities Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-26 Ali A. Al-Temeemy
This paper describes the development of a new laser speckle imaging method for extracting speckle patterns' temporal activity information with superior extraction and discrimination capabilities. It is based on a novel mechanism which uses the speckle images, in an unconventional manner, through adapting the levels of their interval, to deal with the scattering medium that contains regions with different
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Fusion of multiscale gradient domain enhancement and gamma correction for underwater image/video enhancement and restoration Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-23 Amarendra Kumar Mishra, Manjeet Kumar, Mahipal Singh Choudhry
Underwater images and video often suffer from poor visibility and color cast because light gets scattered and absorbed in water. To solve this problem, a novel method based on the fusion of multiscale gradient-domain enhancement and gamma correction is proposed for underwater images and video enhancement. Firstly, a white balance is used for color correction to the input underwater image and video
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Optical parametric-assist frequency modulation for FMCW Lidar enabling double-range velocity measurement Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-22 Hao Zhang, Qijie Xie, Quanxin Na, Nan Zhang, Lei Wang, Li Qin, Junfeng Song, Lijun Wang
Frequency-modulated continuous waves (FMCW) Lidar functioned as simultaneous measurement of velocity and distance has shown promising prospects in many applications. Direct modulation on semiconductor lasers is a common approach to achieve linear optical frequency scanning in FMCW Lidar for the simple configuration and easy implementation. However, the directly-modulated laser used to suffer from the
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High-sensitivity determination of ethanol concentration based on weak measurement system with Faraday effect Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-22 Yong Zhang, Jiayou Tao, Zhaoxin Wen, Ting Jiang, Yifei Song, Zhaoming Luo
A high-sensitivity detection method is proposed for ethanol concentration based on weak measurement system with Faraday effect, and the improvement law of the sensitivity is studied. Different from chiral solution determination, the post-selection angle of the system is modified by the Faraday rotation angle of ethanol solution. The amplified photonic spin Hall effect acts as a probe for detecting
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Splitting the backbone: A novel hierarchical method for assessing light field image quality Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-22 Wenzhong Guo, Hanling Wang, Xiao Ke
The rising popularity of light field imaging underscores the pivotal role of image quality in user experience. However, evaluating the quality of light field images presents significant challenges owing to their high-dimensional nature. Current quality assessment methods for light field images predominantly rely on machine learning or statistical analysis, often overlooking the interdependence among
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Dual-frequency phase unwrapping based on deep learning driven by simulation dataset Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-22 Ze Li, Wen Zhang, Shuo Shan, Peng Xu, Jintao Liu, Jianhua Wang, Suzhen Wang, Yanxi Yang
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Single-shot synthetic wavelength imaging: Sub-mm precision ToF sensing with conventional CMOS sensors Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-22 Manuel Ballester, Heming Wang, Jiren Li, Oliver Cossairt, Florian Willomitzer
We present a novel single-shot interferometric ToF camera targeted for precise 3D measurements of dynamic objects. The camera concept is based on Synthetic Wavelength Interferometry, a technique that allows retrieval of depth maps of objects with optically rough surfaces at submillimeter depth precision. In contrast to conventional ToF cameras, our device uses only off-the-shelf CCD/CMOS detectors
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Multi-wavelength pinhole point diffraction interferometry for optics metrology with interferometric intensity based phase retrieval method Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-21 Leqi Geng, Bing Li, Zhuo Zhao, Jiasheng Lu
In this paper, we propose a multi-wavelength pinhole point diffraction interferometry (MPPDI) and a two-step phase extraction method based on the interferometric intensity information. MPPDI is mainly used to extend the dynamic measurement range of traditional pinhole point diffraction interferometry (PPDI) to realize the measurement of large-aperture and high-order aspheric surface. Spherical/aspherical
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Mueller-Gabor holographic microscopy Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-21 Maria J. Lopera, Maciej Trusiak, Ana Doblas, Heidi Ottevaere, Carlos Trujillo
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An efficient targeted design for real-time defect detection of surface defects Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-21 Wenqi Cui, Kechen Song, Xiujian Jia, Hongshu Chen, Yu Zhang, Yunhui Yan, Wenying Jiang
In practical industrial applications, the inference speed of deep learning models directly affects the efficiency of industrial production. Therefore, the lightweight real-time detection method of surface defects is an essential task in the industrial process. We need to achieve a favorable balance between efficiency and accuracy since the rising demand for production efficiency. However, most of the
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Focal length measurement based on vortex beam interference Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Jiantai Dou, Xinlei He, Youyou Hu, Xiuzheng Chen, Zhongming Yang
This paper proposes a new method to measure the focal lengths of both convex and concave lenses based on vortex beam interference. Theoretical analysis illustrates that the maximum intensity distribution of the interferogram is in accordance with the Fermat's spiral, and the spiral coefficient is proportional to the difference between the focal length of the test lens and the distance from the test
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Improved polarization scattering imaging using local-global context polarization feature learning framework Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Xueqiang Fan, Weiyun Chen, Bing Lin, Peng Peng, Zhongyi Guo
Polarization scattering imaging (PSI) is an extremely challenging problem due to the fact that scattering media can lead to severe degradation of the object information. In this paper, we propose a novel high-performance computational method, the PSI based on a well-designed local-global context polarization feature learning (LGCPFL) framework, named PSI-LGCPFL, to efficiently retrieve the target’s
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Study on the superposition effect of stress waves and crack propagation law between blastholes at different angles Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Shuai You, Renshu Yang, Chenglong Xiao, Chenxi Ding, Chengxiao Li, Zhen Yang, Jin Li
The drilling and blasting method is extensively employed in various industries such as mining and infrastructure construction. In the majority of blasting operations, strip-charges are predominantly utilized, while blastholes often exhibit an angled orientation in practical engineering scenarios. To investigate the stress wave superposition effect and the crack propagation law among blastholes at varying
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High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Yufu Xu, Hongchao Qi, Xinyu Zhao, Chenxi Li, Ke Chen
A high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot sensor is presented. The demodulation system only consists of a near-infrared distributed Bragg reflector (DBR) laser, a fiber circulator, a photodetector and a signal processing circuit. By quickly cyclically setting the grating current and phase current of the DBR laser, the laser wavelength is scanned
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Radiance-field holography for high-quality 3D reconstruction Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Taijiang Liu, Honglong Ning, Hongkun Cao, Dongxiang Luo, Kefeng Tu, Xianzhe Liu, Zhennan Zhu, Haoyan Chen, Guoping Su, Rihui Yao, Junbiao Peng
Conventional light field-based computer-generated holograms, such as holographic stereograms, can provide nature parallax and accurate occlusion relation but are restricted by the inherent tradeoff concerning the angular and spatial resolution of the reconstructed optical field. In contrast, Wigner distribution function based light field generated holograms, also called non-hogel-based holograms, release
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Polarization image demosaicking based on homogeneity space Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Yang Lu, Weihong Ren, Yiming Su, Zhen Zhang, Junchao Zhang, Jiandong Tian
The advent of the micro-polarizer array allows focal plane sensors to capture polarized light information, resulting in the acquisition of subsampled polarization intensity images. The process of reconstructing a comprehensive representation of polarization information is called polarization demosaicking. Current polarization demosaicking methods are susceptible to encountering polarization artifacts
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Joint target geometry and polarization properties for polarization image fusion Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Jin Duan, Ju Liu, Youfei Hao, Guangqiu Chen, Yue Zheng, Linfeng Jia
Traditional polarization image fusion focuses on mining information from the source image and realizes polarization image fusion by finding the feature balance point between two source images. However, this method is strictly limited to high quality and sufficiently informative source polarization images. In addition, if the fusion rules are formulated in terms of the dimensions of the source image
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Dual-channel on-chip data transmission system using UV light based on GaN-on-Si wafer Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-20 Jiabin Yan, Zhihang Sun, Li Fang, Yiqun Yan, Zheng Shi, Fan Shi, Hao Zhang, Yongjin Wang
The ultraviolet photonic integrated circuits possess application prospects in ultraviolet (UV) microscopy, bio-sensing, on-chip data communication, etc. Herein, we propose a UV light on-chip data transmission system based on epitaxial GaN on silicon. This simple system includes a light-emitting diode light source, a modulator, a Y-branch waveguide and two photodetectors. Both direct modulation and
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Computational adaptive telescope imaging via self-interference digital holography Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-19 Wenxue Zhang, Tianlong Man, Hongqiang Zhou, Minghua Zhang, Ali Zia, Yuhong Wan
Conventional optical telescope only collect the amplitude of optical wavefront with incoherent light, while self-interference incoherent digital holography offers a unique method of coding both the optical wavefront amplitude and phase information by interference patterns. We developed an adaptive non-scanning three-dimensional (3D) telescopic imaging technique based on self-interference incoherent
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An innovative 16-bit projection display based on quaternary hybrid light modulation Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-19 Yue Pan, Yajie Cao, Liang Xu, Motong Hu, Qing Jiang, Shuqin Li, Xiaowei Lu
Conventional spatial light modulators (SLM) can only be used for projecting 8-bit or 10-bit images at normal frame rate. Therefore, commercial high dynamic range (HDR) displays typically focus on boosting the contrast while neglecting to raise the bit-depth. Existing methods for high bit-depth display generally rely on stacking two SLMs to modulate the outgoing beam twice, namely multiplicative modulation
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Single-shot wavelength meter on a chip based on exponentially increasing delays and in-phase quadrature detection Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-19 C.R. Coggrave, P.D. Ruiz, C.A. Pallikarakis, J.M. Huntley, H. Du, M. Banakar, X. Yan, D.T. Tran, C.G. Littlejohns
A solid-state wavelength measuring instrument based on a SiO photonics platform is presented. The chip-scale wavemeter device has no moving parts and allows instantaneous wavelength measurement with high precision and accuracy over a nominal bandwidth of 40 nm in the O-band. The wavemeter design is based on multimode interferometer (MMI) couplers and a multi-band Mach–Zehnder interferometer (MZI) structure
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Out-of-focus artifact removal for Fresnel incoherent correlation holography by deep learning Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-18 Tao Huang, Jiaosheng Li, Qinnan Zhang, Weina Zhang, Jianglei Di, Difeng Wu, Xiaoxu Lu, Liyun Zhong
Fresnel incoherent correlation holography (FINCH) is a promising three-dimensional (3D) imaging method due to its incoherent illumination and inline optical configuration. However, due to information crosstalk, especially out-of-focus artifacts, the axial resolution of FINCH 3D imaging is limited, and the relationship between the artifacts and the reconstructed image is complex and nonlinear, which
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Polarization image fusion method based on polarization saliency with generator adversarial network Opt. Laser Eng. (IF 4.6) Pub Date : 2024-03-18 Jin Duan, Jingyuan Song, Yong Zhu, Hao Zhang, Ju Liu, Yue Zheng
Aiming at the problem that the polarization image fusion process does not make good use of the polarization imaging characteristics, we propose a polarization image fusion method based on polarization saliency. On the one hand, we propose a new definition of physical property characterization based on polarization properties:polarization saliency. We construct it from three perspectives: image difference