Optics and Lasers in Engineering最新文献_第10页

Autofocusing method for multifocal holograms based on connected domain analysis 基于连接域分析的多焦全息图自动聚焦方法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-07 DOI: 10.1016/j.optlaseng.2024.108624

Kaiqi Lang , Jiaqing Qiang , Yuyi Qiu , Xiaoping Wang

{"title":"Autofocusing method for multifocal holograms based on connected domain analysis","authors":"Kaiqi Lang , Jiaqing Qiang , Yuyi Qiu , Xiaoping Wang","doi":"10.1016/j.optlaseng.2024.108624","DOIUrl":"10.1016/j.optlaseng.2024.108624","url":null,"abstract":"<div><div>Holography is widely used for imaging plankton because of its large depth of field. Autofocusing is a critical step in holographic imaging, where the optimal focal plane is determined by locating the extremum of the evaluation function curve. However, most of these methods perform auto-focusing on single focus holograms. To apply these methods to multi-focus holograms, the hologram must be subjected to object segmentation. It is difficult to achieve good results when focusing on holograms with small objects and large depth of field. Therefore, we propose a multi-focus autofocus method based on connected domain analysis (CDA), which allows focusing on multiple objects at different focal lengths simultaneously without image segmentation. Each object generates a focus evaluation curve, resulting in high focusing accuracy. We set up an in-line holographic optical system with a 30 mm depth of field and recorded holograms of <em>Nauplius, Cladocera, Rotifera, Copepods, Noctiluca scintillans</em> and real seawater samples. We demonstrated the robustness of the CDA algorithm for different target types and its effectiveness in focusing multi-focus images by applying it to holograms of six types of samples.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108624"},"PeriodicalIF":3.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of coherence-polarization matrix from a single-frame recording 通过单帧记录测量相干极化矩阵

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-07 DOI: 10.1016/j.optlaseng.2024.108611

Sourav Chandra, Rakesh Kumar Singh

{"title":"Measurement of coherence-polarization matrix from a single-frame recording","authors":"Sourav Chandra, Rakesh Kumar Singh","doi":"10.1016/j.optlaseng.2024.108611","DOIUrl":"10.1016/j.optlaseng.2024.108611","url":null,"abstract":"<div><div>Characterization of statistical properties of a vector source requires fast and efficient measurement of all four elements of the square coherence-polarization (BCP) matrix. Here, we report a new experimental technique for measuring the BCP matrix of the stochastic field using a single-intensity recording. A detailed theoretical framework is presented to measure the elements of the BCP matrix of vector source through polarization correlation of the first two Stokes parameters (SPs), S<sub>0</sub> and S<sub>1</sub>. We validate our technique through numerical simulations followed by proof-of-principle experiments. Experimental demonstration is performed by employing a specially designed folded interferometer to coherently sum a vector random field with a known reference and subsequently leverage a tuneable beam displacer to capture the orthogonal polarization components to determine the first two SPs in a single-frame recording. A correlation of these two SPs and their Fourier processing enables the extraction of all four elements of the BCP matrix from a single-intensity recording. The viability of our experimental technique is demonstrated by measuring all four elements of the BCP matrix for three different vector sources in the far-field. A good agreement between simulation and experimental results confirms the accuracy of the proposed technique. This method will find applications in the characterization of light fields, evaluating the polarization dynamics, looking through randomness, etc.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108611"},"PeriodicalIF":3.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Foreground-background separation and deblurring super-resolution method 前景-背景分离和去模糊超分辨率方法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-05 DOI: 10.1016/j.optlaseng.2024.108629

Xuebin Liu, Yuang Chen, Chongji Zhao, Jie Yang, Huan Deng

{"title":"Foreground-background separation and deblurring super-resolution method","authors":"Xuebin Liu, Yuang Chen, Chongji Zhao, Jie Yang, Huan Deng","doi":"10.1016/j.optlaseng.2024.108629","DOIUrl":"10.1016/j.optlaseng.2024.108629","url":null,"abstract":"<div><div>The limited depth of field (DOF) inherent in cameras often results in defocused and blurry backgrounds when capturing images in large aperture mode. This not only leads to the loss of crucial background information but also impedes the efficient reconstruction of the background regions. Usually, super-resolution (SR) techniques struggle to produce high-quality results for images captured with large apertures. To enhance the reconstruction quality of defocused regions in large aperture images, a foreground-background separation and deblurring super-resolution (FBSDSR) method was proposed in this paper. Based on the idea of foreground-background separation processing, we first divide the large aperture image into a sharp foreground region (I<sub>f</sub>) and a blurry background region (I<sub>b</sub>) based on depth information. The background region (I<sub>b</sub>) is then deblurred using an end-to-end iterative filter adaptive network (IFAN). This deblurring process refocuses the background, ultimately restoring an image with sharp details throughout. Finally, the enhanced super-resolution generative adversarial networks (Real-ESRGAN) which specializes in images SR of realistic scenes was used to process the sharp all-in-focus image. This method results in high-quality reconstructions of both the foreground and background of large aperture images. The experimental results demonstrated that the proposed method achieved effective reconstruction of the entire large aperture images clearly, overcoming the limitations of existing methods that struggle to reconstruct defocused regions. This significantly enhances the quality and resolution of large aperture images. Specifically, when FBSDSR is integrated with Real-ESRGAN, the PSNR, LPIPS, NIQE, and hyperIQA metrics were improved by approximately 2.2 %, 45.1 %, 34.7 %, and 10.9 % respectively.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108629"},"PeriodicalIF":3.5,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Q refractive index sensor with an ultrawide detection range based on topological bound states in the continuum 基于连续体拓扑束缚态的超宽检测范围高 Q 值折射率传感器

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-05 DOI: 10.1016/j.optlaseng.2024.108621

Bin Hou, Zao Yi, Qianju Song

{"title":"High-Q refractive index sensor with an ultrawide detection range based on topological bound states in the continuum","authors":"Bin Hou, Zao Yi, Qianju Song","doi":"10.1016/j.optlaseng.2024.108621","DOIUrl":"10.1016/j.optlaseng.2024.108621","url":null,"abstract":"<div><div>Previous studies on refractive index sensors have shown that their sensing characteristics are limited by variations in the background environment refractive index, resulting in a significant decrease in the figure of merit (FOM) and sensitivity of the sensor. Here, we design a high-Q refractive index sensor, which is composed of a Dirac semimetal. The proposed sensor is based on topological bound states in the continuum (BICs), which have a diverging quality factor, and exhibits extremely high FOM and detection sensitivity over a wide variation range of the background environment refractive index. Its operation is based on the reciprocating motion of two pairs of BICs in the <em>k</em><sub><em>x</em></sub> and <em>k</em><sub><em>y</em></sub> high-symmetry lines of the momentum space. Specifically, two pairs of BICs, which are characterized by topological charges, can be merged and generated by varying the Fermi energy of the Dirac semimetal. Furthermore, we extract the relation between the Fermi energy and the background environment refractive index for the merging-BIC. This ensures that the FOM is extremely high over a very wide variation range of the background environment refractive index. Our findings provide a perspective for investigating ultrahigh performance refractive index sensors based on merging-BICs.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108621"},"PeriodicalIF":3.5,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Single-shot Fresnel incoherent correlation holography based on digital self-calibrated point source holograms 基于数字自校准点源全息图的单次菲涅尔不相干全息术

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-05 DOI: 10.1016/j.optlaseng.2024.108616

Huiyang Wang , Tianzhi Wen , Shengde Liu , Hongzhan Liu , Migao Li , Xiaoxu Lu

{"title":"Single-shot Fresnel incoherent correlation holography based on digital self-calibrated point source holograms","authors":"Huiyang Wang , Tianzhi Wen , Shengde Liu , Hongzhan Liu , Migao Li , Xiaoxu Lu","doi":"10.1016/j.optlaseng.2024.108616","DOIUrl":"10.1016/j.optlaseng.2024.108616","url":null,"abstract":"<div><div>Achieving high quality 3D imaging with single exposure has always been the goal of Fresnel incoherent correlation digital holography (FINCH). However, there is a trade-off between space-time bandwidth product and system complexity, resulting in lower reconstruction quality of FINCH. Here, we propose a single-shot FINCH method based on digital self-calibrated point source holograms (PSHs) to achieve dynamic 3D imaging. Firstly, it demonstrates that a single FINCH hologram integrates information from multiple incoherently superimposed PSHs, so that the reconstructed images exhibit significant sparsity variations in the gradient domain when correlated with the PSHs to be calibrated. As a result, we can conveniently achieve accurate PSHs of objects at different depth planes by digital self-calibration algorithm. Furthermore, by combining the digital self-calibrated PSHs with a compressive sensing (CS) reconstruction algorithm, the quality of the 3D reconstruction can be effectively enhanced, showing excellent performance in improving lateral and axial resolution. Importantly, this method offers a new strategy for simplifying implementation system and improving space-time bandwidth product of FINCH technology, and then achieves high quality 3D imaging of dynamic scene.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108616"},"PeriodicalIF":3.5,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast error detection method for additive manufacturing process monitoring using structured light three dimensional imaging technique 利用结构光三维成像技术快速检测增材制造过程监控误差的方法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-04 DOI: 10.1016/j.optlaseng.2024.108609

Jack Girard, Song Zhang

引用次数: 0

Design and analysis of single-electrode integrated lithium niobate optical phased array for two-dimensional beam steering 用于二维光束转向的单电极集成铌酸锂光学相控阵的设计与分析

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-04 DOI: 10.1016/j.optlaseng.2024.108617

Jingwei Li , Huaibin Zheng , Yuyuan Han , Bin Li , Wenxuan Hao , Long Qiu , Yanyan Liu , Yuchen He , Xiaoyong Wei , Zhuo Xu

{"title":"Design and analysis of single-electrode integrated lithium niobate optical phased array for two-dimensional beam steering","authors":"Jingwei Li , Huaibin Zheng , Yuyuan Han , Bin Li , Wenxuan Hao , Long Qiu , Yanyan Liu , Yuchen He , Xiaoyong Wei , Zhuo Xu","doi":"10.1016/j.optlaseng.2024.108617","DOIUrl":"10.1016/j.optlaseng.2024.108617","url":null,"abstract":"<div><div>The realization of high-speed, low-power optical phased array (OPA) on thin-film lithium niobate on insulator (LNOI) is considered an ideal solution for the next generation of solid-state beam steering. Most reported on-chip two-dimensional optical phased arrays suffer from issues such as large antenna spacing, high power consumption and complex wiring due to independent control of array elements. To address these challenges while fully utilizing the benefits of the LNOI platform, we propose a two-dimensional beam-scanning OPA based on lithium niobate (LN) waveguides. We design a multi-layer cascaded domain engineering structure inside the LN waveguide, combined with wavelength tuning, to enable two-dimensional beam scanning with single electrode controlling the OPA. Through simulation, we achieve a 42°×9.2° two-dimensional beam steering. Compared to existing on-chip integrated OPAs, this work offers significant advantages in increasing integration, simplifying control units and reducing power consumption.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108617"},"PeriodicalIF":3.5,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-color live-cell super-resolution fluorescence lifetime imaging via polarization modulation-based fluorescence emission difference 通过基于偏振调制的荧光发射差分实现双色活细胞超分辨率荧光寿命成像

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-03 DOI: 10.1016/j.optlaseng.2024.108547

Wanjie Dong , Yuran Huang , Wenli Tao , Liang Xu , Yubing Han , Xiang Hao , Cuifang Kuang , Xu Liu

{"title":"Dual-color live-cell super-resolution fluorescence lifetime imaging via polarization modulation-based fluorescence emission difference","authors":"Wanjie Dong , Yuran Huang , Wenli Tao , Liang Xu , Yubing Han , Xiang Hao , Cuifang Kuang , Xu Liu","doi":"10.1016/j.optlaseng.2024.108547","DOIUrl":"10.1016/j.optlaseng.2024.108547","url":null,"abstract":"<div><div>Fluorescence lifetime imaging microscopy (FLIM) has been proposed as an important technique for understanding the chemical microenvironment in cells and tissues, as it provides additional information compared to conventional fluorescence imaging. However, it is often hindered by limited spatial resolution and signal-to-noise ratio (SNR). In this study, we introduce a dual-color super-resolution FLIM method, termed Parallel Detection and Fluorescence Emission Difference (PDFED) FLIM. The integration of parallel detection with photon reassignment enhances photon efficiency, SNR, and resolution effectively. Additionally, differential imaging employing polarization modulation effectively reduces artifacts resulting from sample changes during live-cell imaging. PDFED-FLIM demonstrates enhancements in spatial resolution by approximately 1.6 times and peak signal-to-noise ratio (PSNR) by around 1.3 times. Furthermore, live-cell imaging showcases improved resolution and image quality, signifying the extensive potential of PDFED-FLIM in biomedical applications.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108547"},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The spectral mismatch correction factor estimation using broadband photometer measurements and catalog parameters for tested white LED sources 利用宽带光度计测量结果和已测试白光 LED 光源的目录参数估算光谱失配校正系数

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-02 DOI: 10.1016/j.optlaseng.2024.108614

Irena Fryc , Maciej Listowski , Robert Supronowicz , Dorota Mozyrska , Eric Rosas , George Eppeldauer , Peter Csuti , Alejandro Ferrero

{"title":"The spectral mismatch correction factor estimation using broadband photometer measurements and catalog parameters for tested white LED sources","authors":"Irena Fryc , Maciej Listowski , Robert Supronowicz , Dorota Mozyrska , Eric Rosas , George Eppeldauer , Peter Csuti , Alejandro Ferrero","doi":"10.1016/j.optlaseng.2024.108614","DOIUrl":"10.1016/j.optlaseng.2024.108614","url":null,"abstract":"<div><div>Using a modeled look-up chart developed in this work, we show that accurate photometric measurements of characteristics like illuminance or luminous intensity of test LED sources can be measured in one step. This is a simple broadband measurement that may substitute for complicated and costly spectral measurements currently in place. To develop the look-up chart, the typical minimum and maximum of the Spectral Mismatch Correction Factor (SMCF) for a given photometers was estimated in relation to catalog parameters of the LEDs such as correlated color temperature (CCT) and melanopic daylight efficacy ratio (<span><math><mtext>mDER</mtext></math></span>). This research was based on the unique and large dataset of real photometers spectral response <span><math><mrow><msub><mi>s</mi><mtext>rel</mtext></msub><mrow><mo>(</mo><mi>λ</mi><mo>)</mo></mrow></mrow></math></span> collected and measured at accredited laboratories located at America, Asia and Europe and modeled LED's spectral power distribution (SPD) data. Independent look-up tables were developed for color-mixed LEDs (cm-LEDs) and white phosphor-converted LEDs (pc-LEDs), two common LED types.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108614"},"PeriodicalIF":3.5,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Positioning of the test surface in a CGH null test by cat's eye interference 通过猫眼干扰确定 CGH 空测中测试面的位置

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-02 DOI: 10.1016/j.optlaseng.2024.108627

Hao Xu, Wenwen Lu, Shanyong Chen

{"title":"Positioning of the test surface in a CGH null test by cat's eye interference","authors":"Hao Xu, Wenwen Lu, Shanyong Chen","doi":"10.1016/j.optlaseng.2024.108627","DOIUrl":"10.1016/j.optlaseng.2024.108627","url":null,"abstract":"<div><div>Interferometric null test of optical aspheres and freeforms is one of the most established methods, in spite of recognized limitations related to positioning of the test surface. Slight misalignment of the surface in the null test system can introduce remarkable wave aberrations. Current approaches for positioning the test surface are based on a series of fiducial marks or retroreflectors set at given spots around the test surface, which consequently suffer the problem of datum transformation. We propose a method for positioning the test surface in a null test by cat's eye interference without any fiducial marks or retroreflectors. A computer-generated hologram (CGH) is used as null optics fabricated with null test pattern, alignment pattern and positioning pattern. A part of test beam with relatively small f/number is diffracted through the positioning pattern and then focuses on certain spots of the test surface. The cat's eye reflection from the test surface returns to the interferometer and interferes with the reference beam. It is then possible to precisely position the test surface by measuring the wavefront error of the cat's eye interference. The design method for such a CGH positioning pattern is presented, following the physical constraint that the surface normal at the cay's eye reflection is right the angular bisector of the positioning beam. Analysis on the positioning performance is then presented to show the sensitivity to misalignment including defocus, lateral shift and tip-tilt, which at last is experimentally verified by measuring an even asphere with a CGH.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108627"},"PeriodicalIF":3.5,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0