Optics and Lasers in Engineering最新文献

{"title":"Image reconstruction algorithms for optical diffraction tomography microscopy: A review","authors":"Yun Guo ,&nbsp;Zhengfei Zhuang ,&nbsp;Tongsheng Chen ,&nbsp;Min Hu","doi":"10.1016/j.optlaseng.2025.109163","DOIUrl":"10.1016/j.optlaseng.2025.109163","url":null,"abstract":"<div><div>Optical diffraction tomography (ODT) is a label-free 3D quantitative phase imaging technique that utilizes the refractive index (RI) contrast for visualization, offering advantages such as non-invasiveness, non-destructiveness, long-term imaging, and high spatial resolution (&lt; 200 nm). Over the past decade, significant advances in the ODT system hardware and software have enabled comprehensive visualization of living cells' subcellular structures, driving applications in cell biology, biophysics, and immunology. To fully harness the potential of ODT hardware, it is imperative to develop advanced reconstruction algorithms. This review elaborates on the fundamental physical principles and implementation methods of ODT, with a particular emphasis on image reconstruction algorithms. Various reconstruction approaches are systematically analyzed, including the direct inversion method, the filtered backpropagation method, and various more accurate reconstruction approaches based on high-order scattering models. The strengths and limitations of these methods are summarized, along with discussions on recent advancements in the field. Furthermore, the potential contributions of fluorescence microscopy and deep learning to improving ODT imaging are explored. Finally, future directions for the advancement of ODT technology are proposed.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109163"},"PeriodicalIF":3.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481137","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}

{"title":"Mechanisms of light field modulation in parameter-tuned cascaded microcavity optical tweezers and particle sorting study","authors":"Chunlei Jiang,&nbsp;Zhaoqi Ji,&nbsp;Peng Chen,&nbsp;Xu Liu,&nbsp;Zhaotong Song,&nbsp;Jianwei Zhang,&nbsp;Cun Zhao,&nbsp;Xiufang Wang,&nbsp;Yu Sun,&nbsp;Taiji Dong","doi":"10.1016/j.optlaseng.2025.109181","DOIUrl":"10.1016/j.optlaseng.2025.109181","url":null,"abstract":"<div><div>By tuning cascaded microcavity length and orifice dimensions, this study reveals a light-field modulation mechanism in microcavity optical tweezers, where parameter-optimized configurations (include Field Uniformity and Energy Transfer Efficiency) generate tunable optical gradients at the orifice. Results demonstrate that choosing a microcavity of an appropriate size can enable the light force to dominate at the aperture, supplemented by fluidic force, and generate a more uniform light field. Under these conditions, size-matched particles overcome the optical trapping constraints at the aperture and are captured within the microcavity under the influence of fluidic forces from surrounding weak optical force regions, while other particles are repelled. This achieves particle size sorting. The work clarifies microcavity parameter-dependent optical-hydrodynamic coupling and establishes a synergistic multi-physics manipulation strategy, advancing applications in single-cell sorting and nanodrug screening.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109181"},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470304","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}

{"title":"Study on stress intensity factor identification of a multi-cracked elastomer based on digital speckle pattern combined with transfer learning","authors":"Wei Liu ,&nbsp;Bowen Liu ,&nbsp;Guowen Wang ,&nbsp;Houlu Sun ,&nbsp;Zhiqian Zhang ,&nbsp;Yucheng Wu","doi":"10.1016/j.optlaseng.2025.109179","DOIUrl":"10.1016/j.optlaseng.2025.109179","url":null,"abstract":"<div><div>In multi-cracked elastomers, the fracture parameter at each crack tip is significantly influenced by neighboring cracks, complicating their identification using conventional optical methods such as digital image correlation (DIC). This study presents a novel approach that combines digital speckle pattern reconstruction with transfer learning to accurately and efficiently identify fracture parameters of multi-cracked elastomers. Finite element models were established to determine numerical displacement fields and calculate mixed-mode stress intensity factors (SIFs) of two-dimensional (2D) multi-cracked plates under various loading conditions. Synthetic deformed speckle images were generated from reference images by applying numerical displacements. A deep convolutional neural network (DCNN) with transfer learning was then trained using a dataset composed of numerous pairs of reference and deformed speckle images as inputs and the corresponding mixed-mode SIFs at different crack tips as outputs. Tensile and four-point bending tests were performed on 2D polymethyl methacrylate (PMMA) plates with randomly distributed cracks to evaluate the method’s practical performance. Results demonstrated that the proposed method combining digital speckle pattern reconstruction with deep learning can be employed to identify the mixed-mode fracture parameters of multi-cracked elastomer with high accuracy and efficiency.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109179"},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366450","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}

{"title":"Dynamic speckle generation tuned by thermo-optic effects","authors":"Vicente Reyes-Alejo,&nbsp;Jose R. Guzman-Sepulveda","doi":"10.1016/j.optlaseng.2025.109176","DOIUrl":"10.1016/j.optlaseng.2025.109176","url":null,"abstract":"<div><div>We present a strategy for the generation of dynamic, random speckles, whose characteristic fluctuation time can be adjusted controllably by tuning the volume scattering properties of a complex medium by means of its geometrical size and thermo-optic effects. We engineered a thermo-optical colloidal suspension, around the condition of refractive index matching between the particles and the suspending medium, that allows experiencing different regimes of volume scattering (null, single, multiple) controllably as temperature is varied. We characterized the temporal fluctuations of dynamic speckles in a dedicated optical fiber-based setup, in transmission, where we placed the thermo-optic colloidal suspension between the facets of two collinear optical fibers; a multimode fiber sets the input, static speckle, and the output, dynamic speckle is collected with a single-mode fiber for its characterization. The characteristic fluctuation time was successfully tuned by one order of magnitude, in the range <span><math><mrow><mn>10</mn><mtext>ms</mtext><mo>≤</mo><mi>τ</mi><mo>≤</mo><mn>100</mn><mtext>ms</mtext></mrow></math></span>. Because dynamic speckles are generated through the light scattering of Brownian particles, realizations are ensured to be random, statistically independent regardless of the fluctuation rate.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109176"},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365949","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}

{"title":"Large dynamic cophasing error correction based on improved stochastic parallel gradient descent algorithm","authors":"Dong Peng ,&nbsp;Bing Dong ,&nbsp;Guoliang Tian ,&nbsp;Jinping He","doi":"10.1016/j.optlaseng.2025.109168","DOIUrl":"10.1016/j.optlaseng.2025.109168","url":null,"abstract":"<div><div>The correction of cophasing errors in segmented mirrors is essential for achieving diffraction-limited performance in large-aperture telescopes. In this paper, we propose an improved stochastic parallel gradient descent (SPGD) algorithm, referred to as cophasing SPGD (CSPGD), specifically designed for large dynamic cophasing error correction. The improvements include the integration of Nesterov momentum and the Adam optimizer to accelerate convergence, along with adaptive gain coefficients to ensure stability. We introduce novel metric functions tailored for significant cophasing errors, which extend the algorithm's capture range. The normalized second moment of the image intensity is utilized for large tip-tilt correction, while the integral of the side lobes of the squared modulation transfer function (MTF) under narrowband and broadband illumination is employed for large piston correction and fine phasing, respectively. Through numerical simulations and experimental validations, the CSPGD algorithm demonstrates superior performance in correcting large piston and tip-tilt errors in segmented mirrors, providing a robust and efficient solution for the cophasing tasks of segmented telescopes.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109168"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366444","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}

{"title":"Collimated phase measuring deflectometry II: Re-design of the optical layout for high-curvature surfaces","authors":"Corey Austin ,&nbsp;Wanqi Shang ,&nbsp;Lei Huang ,&nbsp;Tianyi Wang ,&nbsp;Carl Paterson ,&nbsp;Peter Török ,&nbsp;Mourad Idir","doi":"10.1016/j.optlaseng.2025.109173","DOIUrl":"10.1016/j.optlaseng.2025.109173","url":null,"abstract":"<div><div>Collimated phase measuring deflectometry (CPMD) is an optical metrology technique developed to improve upon traditional phase measuring deflectometry (PMD). CPMD utilizes telecentric imaging and collimated structured light illumination to eliminate the height-slope ambiguity present in traditional PMD measurements. After the publication of the first CPMD paper, efforts began to optimize the optical layout of the CPMD system. The first proposed change, and the one detailed in this work, was to move the Fourier transform (FT) lens closer to the surface under test (SUT). Moving the FT lens closer to the SUT meant that for a given FT lens diameter, a larger range of surface slopes on the SUT could be measured. This change to the optical layout was not trivial and introduced at least two concerns that had to be addressed: telecentricity in the imaging path and possible ghost reflections from the re-located FT lens. In this work, we examine how these concerns were addressed and present results showing that the revised optical layout is capable of measurement results at least as good as the original CPMD optical layout. We also demonstrate the increased slope measuring range of the revised optical layout.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109173"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338277","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}

{"title":"OCRN-TransUNet: Enhancing one-to-many temporal optical data cryptanalysis with robustness against multiplicative noise","authors":"Zhenjie Bao ,&nbsp;Changsheng Wan ,&nbsp;Haitao Chen","doi":"10.1016/j.optlaseng.2025.109169","DOIUrl":"10.1016/j.optlaseng.2025.109169","url":null,"abstract":"<div><div>To ensure the vigorous development of the data trading market, data circulation through optical transmission systems assumes paramount importance due to their exceptional transmission efficiency. Securing these systems is an imperative factor, and optical data cryptography offers distinct advantages in ensuring the security of data transmission within them. Furthermore, optical cryptanalysis serves as a catalyst for advancing optical cryptography technology, wherein the correctness of cracking, particularly in the presence of multiplicative noises, holds significant value. Differing in traditional optical cryptanalysis techniques, which incur substantial labor costs, deep learning-based optical cryptanalysis techniques offer a promising alternative that significantly reduces manual effort. However, current deep learning-driven optical cryptanalysis approaches are unable to crack one-to-many temporal optical data encryption methods due to the incomplete considerations within their feature extraction and loss function design. Additionally, they have rarely addressed the enhancement of model robustness against multiplicative noises, given the overt adverse influence that multiplicative noise exerts on cryptanalysis effectiveness. To overcome this problem, we introduce an optical cryptanalysis paradigm named OCRN-TransUNet, which harnesses the strengths of convolutions and transformers, thereby exhibiting immense potential in this challenging domain. Specifically, we combine sub-pixel convolutional layers to enhance TransUNet's capability in performing data upsampling tasks. Moreover, we devise a multifaceted loss function that includes binary cross entropy loss, Pearson correlation coefficient (PCC) loss, and an emendation loss term to bolster the reconstruction ability and robustness of the model. Utilizing plaintext and ciphertext pairs generated by the one-to-many temporal optical data encryption method, we train our deep learning model, achieving direct conversion from the ciphertext to plaintext without knowing the secret key. Experimental results show that the proposed method not only effectively cracks the encryption of one to multiple time domain optical data, but also outperforms TransUNet in terms of convergence as well as cryptanalysis ability and possesses certain robustness against multiplicative noise pollution. Specifically, in the absence of multiplicative noises, we observe an improvement in the Peak Signal-to-Noise Ratio (PSNR) by 1.0881, and an increase in the PCC by 0.0468. In the presence of multiplicative noises with a variance of 1, these enhancements are even more significant, with a boost in PSNR by 1.8337 and an increase in PCC by 0.1605.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109169"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366448","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}

{"title":"LALG: Underwater image enhancement via luminance-aware variational color correction and joint local-global contrast restoration","authors":"Jinqin Zhong ,&nbsp;Peixian Zhuang ,&nbsp;Weidong Zhang ,&nbsp;Lichuan Gu ,&nbsp;Xinwen Wan ,&nbsp;Zheng Liang","doi":"10.1016/j.optlaseng.2025.109171","DOIUrl":"10.1016/j.optlaseng.2025.109171","url":null,"abstract":"<div><div>Underwater image enhancement collected by optical electronic devices often suffers from low contrast, blurry details and color casts due to the interference of scattering and absorption effects, most of current methods enhance the underwater image by designing specialized priors on the illumination and reflectance. Nevertheless, these methods may still result in incomplete color correction and low illumination. To deal with these poor issues, we propose an underwater image method based on luminance-aware variational color correction and joint local-global contrast restoration. Concretely, we propose a luminance-aware variational framework to correct the color casts, which designs an adaptive luminance-aware factor based on the illuminance of underwater scenes, and provides an augmented Lagrange multiplier based alternating direction minimization to solve the variational optimization problem, guiding the correction and illumination improvement simultaneously. In addition, we propose a local contrast enhancement based on the local characteristic of the mean value and the variance value, which can better adapt to the local differences of contrast loss of underwater image. Meanwhile, a simple global contrast is proposed to adaptively compensate the contrast intensity. Comprehensive comparative results on three underwater image enhancement benchmarks demonstrate that our method has a superior performance in revising the color, enhancing the details and improving the contrast of underwater images. It also can produce more excellent quantitative values than state-of-the-art methods, i.e., compared with the second-best method, the average PCQI and <span><math><mover><mrow><mi>r</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> values of our method at least improve by 1.70% and 28.14%, respectively, while the average Blur value of our method at least decline by 11.33%, respectively.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109171"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338278","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}

{"title":"A lightweight 3D foot measurement method base on visual hull and slices-net","authors":"Dong He ,&nbsp;Ameng Li ,&nbsp;Yang Yang ,&nbsp;Bo Gao ,&nbsp;Xiaoli Liu","doi":"10.1016/j.optlaseng.2025.109177","DOIUrl":"10.1016/j.optlaseng.2025.109177","url":null,"abstract":"<div><div>This paper presents a lightweight methodology for 3D foot reconstruction that transitions from visual hull slicing to precise 3D shape, enabling passive 3D measurement. We approximate a rough 3D surface using the visual hull method and perform slicing along the Z-axis to generate visual hull slicing images. A convolutional neural network, named Slices-Net, is designed to transform visual hull slicing images into denser and finer slice images for the reconstruction of precise 3D foot surfaces. Extensive experiments validate that the proposed method achieves an accuracy of up to 1.5 mm and demonstrates high robustness, successfully applying it to 3D foot measurement.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109177"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366449","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}

{"title":"Closed-form expressions for the centroid-tilt error due to scintillation","authors":"Milo W. Hyde IV ,&nbsp;Eric W. Mitchell ,&nbsp;Mark F. Spencer","doi":"10.1016/j.optlaseng.2025.109166","DOIUrl":"10.1016/j.optlaseng.2025.109166","url":null,"abstract":"<div><div>In adaptive optics (AO), the tracker and wavefront sensor commonly measure irradiance centroids (in their respective focal planes) to estimate the turbulence-degraded wavefront in the pupil plane. Several factors affect the accuracy of these centroid measurements, including noise, speckle, and scintillation. The centroid-tilt or “C-tilt” errors due to these factors have been studied by numerous researchers; however, to our knowledge, closed-form expressions for the C-tilt error due to scintillation have not been found.</div><div>In this paper, we derive such expressions, assuming spherical-wave illumination of the pupil, a path-invariant index of refraction structure constant <span><math><msubsup><mrow><mi>C</mi></mrow><mrow><mi>n</mi></mrow><mrow><mn>2</mn></mrow></msubsup></math></span>, and Kolmogorov turbulence. We compare the analytically predicted C-tilt values to those obtained by wave-optics simulations. The agreement is quite good over a wide range of conditions. Researchers and engineers will find this analysis useful when quantifying the performance of centroid-based trackers and wavefront sensors, both of which are critical AO components.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"194 ","pages":"Article 109166"},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338279","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}