Optics and Lasers in Engineering最新文献

{"title":"A quartz-enhanced dual-spectroscopy gas sensor based on dual quartz tuning forks","authors":"Xinru Zhang ,&nbsp;Shaoqiang Bi ,&nbsp;Zhonghai Zhang ,&nbsp;Xuan Liu ,&nbsp;Lu Qin ,&nbsp;Jingqi Shi ,&nbsp;Yiyang Zhao ,&nbsp;Zongliang Wang","doi":"10.1016/j.optlaseng.2025.109049","DOIUrl":"10.1016/j.optlaseng.2025.109049","url":null,"abstract":"<div><div>This paper presents an integrated dual-spectroscopy detection system based on Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) and Light-Induced Thermoelastic Spectroscopy (LITES), employing dual quartz tuning forks (dual-QTFs) for gas detection. In this study, three acoustic microresonators (AMRs) were combined to enhance the QEPAS signals for dual-QTFs. Additionally, the metal layer located at the center of the bottom of QTF1 was chemically etched and removed to allow the laser beam to pass through the bottom of QTF1 and be incident on the surface of QTF2 for LITES excitation. This configuration enables both QEPAS and LITES signals to be generated twice from a single beam. The signals produced by QTF1 and QTF2 were superimposed using an adder to achieve signal enhancement. Acetylene (C₂H₂) was selected as the target gas to evaluate gas sensor performance. Experimental results demonstrated that the minimum detection limit (MDL) for C₂H₂ was 3.80 ppmv, thereby substantiating the efficacy of this gas sensor.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109049"},"PeriodicalIF":3.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069655","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":"Wide-field resolution uniformity for solar ground-layer adaptive optics","authors":"Ying Yang ,&nbsp;Lanqiang Zhang ,&nbsp;Nanfei Yan ,&nbsp;Dingkang Tong ,&nbsp;Xian Ran ,&nbsp;Libo Zhong ,&nbsp;Changhui Rao","doi":"10.1016/j.optlaseng.2025.109053","DOIUrl":"10.1016/j.optlaseng.2025.109053","url":null,"abstract":"<div><div>Ground-layer adaptive optics (GLAO) has significant potential for solar observations of ground-based telescopes due to its ability to provide wide field-of-view (FOV) correction. Ground-based telescopes always pursue high spatial resolution to improve observational quality, which is typically evaluated by the full width at half maximum of the point spread function. However, GLAO system also requires uniform spatial compensation across a wide FOV, particularly for accurate solar magnetic field topology and speckle imaging techniques. Multiple guide stars (GS) are used to detect ground-layer turbulence, and their layout greatly influences observational quality. To this end, in this paper, we optimize the GS layout to improve spatial resolution uniformity for wide-field GLAO. Specifically, we propose a novel wide-field resolution uniformity metric to evaluate the observational quality in GLAO system. Based on this innovative metric, simulations identify two effective GS configurations: the center + ring GS layout achieves higher resolution, and the single ring GS layout exhibits more uniform correction across a wide FOV (improving 41.4% resolution uniformity by trading 2.2% average resolution). To validate this result, we conduct the indoor experiment and on-sky observation. An indoor solar GLAO platform is designed and constructed. Experiments show good agreement with our simulation results. Our on-sky observation is conducted on the 1-m New Vacuum Solar Telescope. GSs in a ring layout improve uniformity by 18.70%, although this comes with a 16.25% reduction in the generalized Fried parameter compared with the center + ring GS layout.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109053"},"PeriodicalIF":3.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941376","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":"Polarization video frame interpolation for 3D human pose reconstruction with attention mechanism","authors":"Xin Zhang ,&nbsp;Xuesong Wang ,&nbsp;Yixuan Xu,&nbsp;Xianyu Wu,&nbsp;Feng Huang","doi":"10.1016/j.optlaseng.2025.109046","DOIUrl":"10.1016/j.optlaseng.2025.109046","url":null,"abstract":"<div><div>Video frame interpolation has been extensively explored and demonstrated, yet its application to polarization remains largely unexplored. Due to the selective transmission of light by polarized filters, longer exposure times are typically required to ensure sufficient light intensity, which consequently lower the temporal sample rates. Furthermore, because polarization reflected by objects varies with shooting perspective, focusing solely on estimating pixel displacement is insufficient to accurately reconstruct the intermediate polarization. To tackle these challenges, this study proposes a deep learning method called Swin-VFI based on the Swin-Transformer and introduces a tailored loss function to facilitate the network's understanding of polarization changes. To ensure the practicality of our proposed method, this study evaluates its interpolated frames in Shape from Polarization and Human Shape Reconstruction tasks, comparing them with other state-of-the-art methods such as CAIN, FLAVR, and VFIT. The experimental results show that our method achieves an average PSNR improvement of 0.43 dB over the suboptimal methods in all tasks.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109046"},"PeriodicalIF":3.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941375","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":"Iterative algorithm for phase extraction from tilt phase-shift interferograms with inhomogeneous background","authors":"Yuqing Liu,&nbsp;Donghui Zheng,&nbsp;Lei Chen,&nbsp;Jingjing Li","doi":"10.1016/j.optlaseng.2025.109072","DOIUrl":"10.1016/j.optlaseng.2025.109072","url":null,"abstract":"<div><div>An iterative algorithm for tilt phase-shift interferograms with inhomogeneous background is proposed in this paper. The regional integration results of the interferograms are fitted with a cosine curve in the time domain to obtain the iterative initial values, then the stepwise iterative optimization is carried out for wavefront phase, background, x-direction tilt shift, and y-direction tilt shift by the least-squares method, respectively, and the phase distribution can be obtained after several rounds of iterations. Feasibility of the algorithm is verified through simulations and experiments. Factors affecting the accuracy of phase calculation are analyzed, and the results show that the proposed method is insensitive to the background light intensity distribution, and there is almost no limit on the number of fringes. The algorithm can accept tilt-shift error with vibration amplitude less than 0.86 π rad and translational-shift error with vibration amplitude less than 0.43 π rad.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109072"},"PeriodicalIF":3.5,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936744","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":"High-quality computational ghost imaging using ADMM fused with low-rank regularization","authors":"Kaiduo Liu ,&nbsp;Tiantian Liu ,&nbsp;Longfei Yin ,&nbsp;Tong Sha ,&nbsp;Lei Chen ,&nbsp;Wenting Yu ,&nbsp;Guohua Wu","doi":"10.1016/j.optlaseng.2025.109029","DOIUrl":"10.1016/j.optlaseng.2025.109029","url":null,"abstract":"<div><div>Computational ghost imaging (CGI) has emerged as a promising technique for diverse imaging applications, particularly in challenging environments. However, achieving high-quality image reconstruction under low sampling rates and noisy conditions remains a significant challenge hindering practical deployment. To overcome these limitations and achieve superior reconstruction quality, we present a novel CGI method based on the Alternating direction method of multipliers (ADMM) fused with Low-rank regularization (GIAL). We also develop a fiber-based ghost imaging setup for experimental validation. Numerical simulations and experimental results validate the exceptional and general reconstruction performance of the proposed GIAL algorithm. Our findings demonstrate the algorithm's remarkable capacity to reconstruct high-quality images at extremely low sampling rates (e.g., 1.56%) and highlight its inherent robustness to noise. These superior characteristics underscore the significant potential of the GIAL method for widespread applications in biomedical imaging and remote sensing scenarios. (To foster transparency and reproducibility, the complete implementation of GIAL is available at <span><span>https://gitee.com/dlammm2066/GIAL</span><svg><path></path></svg></span>, subject to journal policy).</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109029"},"PeriodicalIF":3.5,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941377","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":"Remote identification of microorganisms on various substrates using LIBS and machine learning integration","authors":"Fei Chen ,&nbsp;Jiahui Liang ,&nbsp;Zhihui Tian ,&nbsp;Yang Zhao ,&nbsp;Yan Zhang ,&nbsp;Lei Zhang ,&nbsp;Wangbao Yin ,&nbsp;Peihua Zhang ,&nbsp;Liantuan Xiao ,&nbsp;Suotang Jia","doi":"10.1016/j.optlaseng.2025.109051","DOIUrl":"10.1016/j.optlaseng.2025.109051","url":null,"abstract":"<div><div>To address the health risks associated with microbial contamination, the development of non-contact remote monitoring technology offers a safe, efficient, and accurate means of detection while minimizing the risk of infection. This study examines the use of remote laser-induced breakdown spectroscopy (LIBS) combined with machine learning algorithms to identify and classify microorganisms on various metal and non-metal substrates. The remote LIBS detection system developed in this study integrates a single-pulse nanosecond laser with a zoomable Cassegrain telescope, significantly enhancing its ability to capture spectral signals from samples located 5 m away. Spectral analysis of ten microbial species identified dual spectral lines of elements such as sodium, potassium, and calcium as the primary features. Classification was effectively achieved by using only these selected features in combination with machine learning algorithms. In the classification phase, four machine learning algorithms, Principal Component Analysis combined with k-Nearest Neighbors (PCA-KNN), Partial Least Squares Discriminant Analysis (PLS-DA), Support Vector Machine (SVM), and Random Forest (RF), were applied to categorize the microbial spectra. Evaluation results indicated that the RF algorithm achieved the highest classification accuracy, reaching 91.0 %. To further enhance the RF model’ s performance, several variable models were introduced, including linear, doublet-line ratio, cross ratio, and hybrid models. SHAP value analysis was used to quantify the contributions of key spectral features to model predictions. The results demonstrated that the hybrid model exhibited the best classification performance, improving RF accuracy to 96.5 %, with sodium and calcium doublet-line ratios being key factors in enhancing classification robustness. Additionally, the best model was used to validate bacterial classification on the surfaces of soil and paper substrates, achieving classification accuracies of 92.5 % and 96 %, respectively. This innovative method leverages the non-contact, remote detection capabilities of LIBS technology combined with the precise classification power of machine learning, enabling efficient microbial species identification. This study confirms the effectiveness of remote LIBS technology for non-invasive, rapid microbial detection and illustrates that optimizing spectral feature selection and integrating appropriate machine learning models significantly enhances the accuracy and robustness of LIBS-based microbial classification. These findings highlight the potential of remote LIBS technology in environmental monitoring and public health safety, while also suggesting new strategies for applications in biological weapon defense and infectious disease control.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109051"},"PeriodicalIF":3.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936745","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":"Total variation extrapolation algorithm for high-fidelity terahertz in-line digital holography","authors":"Yiming Liu ,&nbsp;Feifan Fan ,&nbsp;Jiawen Li ,&nbsp;Binjie Ji ,&nbsp;Lu Rong ,&nbsp;Lei Ge ,&nbsp;Hang Zhao ,&nbsp;Yishi Shi ,&nbsp;Dayong Wang ,&nbsp;Min Wan","doi":"10.1016/j.optlaseng.2025.109048","DOIUrl":"10.1016/j.optlaseng.2025.109048","url":null,"abstract":"<div><div>In-line digital holography offers the advantages of compact layout and full utilization of the spatial bandwidth product of the detector, making it widely used in the terahertz band. In this paper, we propose an extrapolated iterative algorithm that combines the object's absorption characteristics with the sparsity of the complex field, enabling high-fidelity retrieval of both amplitude and phase images from a single in-line hologram. At the same time, the size of the hologram is numerically expanded without increasing the system complexity or the data acquisition time. The effectiveness of this algorithm is demonstrated through high-quality imaging of a Siemens star, polypropylene sheet, and dragonfly hindwing. Compared with the phase retrieval algorithm which includes positive absorption constraint, extrapolation method and support domain constraint, our method achieves superior reconstruction quality and more effective twin-image suppression, enhancing the resolution from 310 μm (2.6<em>λ</em>) to 228 μm (1.9<em>λ</em>) and enabling high-fidelity reconstruction of a 30 μm dragonfly hindwing. This work will further enhance the application of continuous-wave terahertz in-line digital holography in biomedical imaging and non-destructive testing.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109048"},"PeriodicalIF":3.5,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932214","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":"Advanced 3D AR display based on custom-designed asymmetric holographic microlens array with high fill factor","authors":"Anar Khuderchuluun ,&nbsp;Hui-Ying Wu ,&nbsp;Munkh-Uchral Erdenebat ,&nbsp;Tuvshinjargal Amgalan ,&nbsp;Ki-Chul Kwon ,&nbsp;Erkhembaatar Dashdavaa ,&nbsp;Young-Seok Kim ,&nbsp;Nam Kim","doi":"10.1016/j.optlaseng.2025.109060","DOIUrl":"10.1016/j.optlaseng.2025.109060","url":null,"abstract":"<div><div>This study presents a novel approach for enhancing three-dimensional (3D) augmented reality (AR) displays through the custom-designed asymmetric holographic microlens array (A-HMA). The A-HMA is specifically designed to enhance the performance of AR display system by balancing spatial resolution, field of view (FOV), and fill factor. It ensures uniform diffraction for a solid volumetric beam profile while maintaining a smooth 3D effect. During the fabrication process, a computer-generated hologram (CGH) pattern of the concave phase profile is generated and employed in conjunction with fully automated holographic wavefront printing. The digitally computed microlens function is sequentially recorded onto a single thin HOE plate through holographic wavefront printing at the precise micro-scale, ensuring a high fill factor and uniformity, both of which are essential for high-quality AR visualization. The asymmetrical structure of the hexagonal hogel layout, precisely fabricated via the holographic wavefront printing system, enhances both packing density and angular coverage, thereby contributing to improved light efficiency and spatial sampling performance. For seamless and realistic 3D scene reconstruction, a hexagonal elemental image array is generated using a direction-inversed propagation algorithm based on computer-generated integral imaging. This algorithm is optimized for the fabricated A-HMA, ensuring efficient computation and accurate reconstruction of real-world objects in the AR display. The proposed 3D AR system successfully reconstructs volumetric 3D scenes with high clarity, providing an immersive AR experience. Experimental results validate the effectiveness of this system, demonstrating its potential for next-generation AR display applications.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109060"},"PeriodicalIF":3.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929624","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":"High modulation depth, ultra-compact, and tunable electro-optical modulator based on dielectric-loaded graphene-plasmonic waveguides","authors":"Saima Kanwal ,&nbsp;Ali M. Abdulsada ,&nbsp;Mir Hamid Rezaei","doi":"10.1016/j.optlaseng.2025.109059","DOIUrl":"10.1016/j.optlaseng.2025.109059","url":null,"abstract":"<div><div>In this study, we propose a novel ultra-compact, tunable electro-optical (EO) modulator based on dielectric-loaded graphene-plasmonic waveguides (DLGPW). By leveraging the exceptional optical and electrical properties of graphene, the modulator achieves high modulation depth (<em>MD</em>) and extinction ratio (<em>ER</em>) for operation in the mid-infrared (MIR) region. The device utilizes surface plasmon polaritons (SPPs) excited at the graphene-dielectric interface, enabling strong light confinement and low propagation losses. By adjusting the chemical potential of graphene through an external voltage, the refractive index of graphene is tuned, allowing for precise control over the resonant wavelength and modulation characteristics. Through detailed numerical simulations using the three-dimensional finite-difference time-domain (3D-FDTD) method, we demonstrate that the proposed modulator achieves an <em>MD</em> of 98.69%, an <em>ER</em> of 18.835 dB, and <em>IL</em> of 2.5 dB, with a modulation bandwidth of 1.13 THz. The ultra-compact design and compatibility with CMOS technology make the proposed modulator a promising candidate for next-generation photonic systems, particularly in applications requiring high-speed and efficient modulation in MIR spectral ranges.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109059"},"PeriodicalIF":3.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921860","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":"Editorial to the special issue on diverse applications of photoelasticity","authors":"K. Ramesh","doi":"10.1016/j.optlaseng.2025.109047","DOIUrl":"10.1016/j.optlaseng.2025.109047","url":null,"abstract":"","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109047"},"PeriodicalIF":3.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144223136","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}