Optics and Laser Technology最新文献

{"title":"Effect of graphene nanoflakes on the hydrogen embrittlement behavior of laser powder bed fusion formed titanium matrix composites","authors":"Junjun Jin ,&nbsp;Zhiyi Zhang ,&nbsp;Min Chen ,&nbsp;Bing Chen ,&nbsp;Feifei Qiu ,&nbsp;Ji Li ,&nbsp;Li Xia ,&nbsp;Lintao Xu ,&nbsp;Zhenghong Fu ,&nbsp;Guoqing Gou","doi":"10.1016/j.optlastec.2025.112682","DOIUrl":"10.1016/j.optlastec.2025.112682","url":null,"abstract":"<div><div>The Ti-6Al-4 V alloy produced by laser powder bed fusion (LPBF) is one of the most typical titanium (Ti) alloys, combining the characteristics of α-Ti and β-Ti. Due to its low density, high strength, good toughness, and biocompatibility, it is widely used in fields such as aerospace, high-speed trains, and medical implants. However, its specific microstructure is sensitive to hydrogen absorption and embrittlement, which limits its broader application. This paper investigates the effects of doped graphene nanoflakes (GNFs) on the microstructure and hydrogen embrittlement (HE) resistance of LPBF-formed titanium matrix composites (TMCs) through microscopic characterization and slow strain rate tensile testing with electrochemical hydrogen pre-charging. The results indicate that the presence of hydrogen atoms adversely affects both the strength and plasticity of the composites with varying graphene content, with increased sensitivity to HE as the graphene content rises. The strength loss rates for composites with 0 wt%, 0.1 wt%, and 0.2 wt% GNFs are 7.29 %, 4.84 %, and 19.23 %, respectively, while the plasticity loss rates are 51.70 %, 59.91 %, and 60.57 %. The fracture mode is primarily a mixed ductile–brittle fracture, with the crack initiation and propagation mechanisms transitioning from transgranular fracture to intergranular fracture. These findings provide a theoretical basis and technical support for the engineering application of LPBF-formed TMCs in hydrogen-rich service environments.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112682"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressure calibration-free gas sensing based on transfer learning assisted wavelength modulation spectroscopy","authors":"Huidi Zhang ,&nbsp;Zifei Li ,&nbsp;Huilin Chen ,&nbsp;Minlei Liu ,&nbsp;Zhechao Qu ,&nbsp;Sheng Zhou","doi":"10.1016/j.optlastec.2025.112687","DOIUrl":"10.1016/j.optlastec.2025.112687","url":null,"abstract":"<div><div>Pressure fluctuations significantly affect the accuracy and stability of traditional wavelength modulation spectroscopy (WMS) technology. To solve this problem, a novel pressure calibration-free gas sensor based on convolutional neural network (CNN) assisted calibration-free wavelength modulation spectroscopy (CF-WMS) was proposed and experimentally demonstrated. The transfer learning (TL) was introduced to fine-tune the CNN pre-trained on the simulated datasets, effectively addressing the issue of scarce experimental data. The performance of the proposed method was investigated and compared with the WMS technique, a sensitivity enhancement factor of 4.17 is achieved under the condition of atmospheric pressure fluctuations within a range of ± 10 mbar. Experimental results confirm the feasibility of utilizing deep learning to enhance WMS performance, particularly in conditions characterized by pressure fluctuations. This work indicates the potential of combining WMS with deep learning to promote the research in gas absorption spectroscopy.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112687"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-low loss bending resistant few-mode hollow core anti-resonant fiber with nested elliptical tubes","authors":"Yundong Hao,&nbsp;Huiyi Guo,&nbsp;Pan Wang,&nbsp;Zhi Wang,&nbsp;Yan-Ge Liu","doi":"10.1016/j.optlastec.2025.112685","DOIUrl":"10.1016/j.optlastec.2025.112685","url":null,"abstract":"<div><div>A novel hollow core anti-resonant fiber with glass-sheet conjoined nested elliptical tubes is proposed and investigated numerically. The elliptical tubes are introduced to original HC-ANF with glass-sheet conjoined cladding, achieving ultra-low loss bending resistant few-mode transmission. Results shows that the proposed fiber with elliptical tubes exhibits lower high-order mode loss and better bending characteristics compared to that with circular tubes due to fact that elliptical tube cladding has a smaller effective air region, which effectively reduces the coupling between higher-order mode in air core and air mode in cladding. At the same time, the elliptical structure has greater negative curvature that makes high-order mode and silica mode have lower overlap. The proposed fiber with optimized parameters can support seven core mode groups, of which the minimum fundamental mode loss is 6.5 × 10^-4 dB/km and maximum LP₄₁ loss is 0.095 dB/km. An outstanding bending property is also proved in our proposed fiber as it can support five core mode groups when bending radius is 2 cm with a minimum fundamental mode loss of 0.001 dB/km and a maximum LP₃₁ loss of 1 dB/km.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112685"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modal decomposition of transverse mode-locked laser beam","authors":"Gang Huang ,&nbsp;Tianshan Zhang ,&nbsp;Yongcheng Huang ,&nbsp;Pengfei Zhou ,&nbsp;Bingxuan Li ,&nbsp;Wenbin Liao ,&nbsp;Zhanglang Lin ,&nbsp;Ge Zhang","doi":"10.1016/j.optlastec.2025.112626","DOIUrl":"10.1016/j.optlastec.2025.112626","url":null,"abstract":"<div><div>Modal decomposition of light is well-known for pattern recognition in studies of waveguides, solid-state lasers as well as fiber lasers. In this letter, we present a modal decomposition technique based on the three-dimensional spatial intensity distribution of structured laser beams. We decompose the geometric modes in the different degenerate cavity and obtain the composition and characteristics of the eigenmodes. In particular, we retrieve the relative phase information of each component which is crucial for high-dimensional data transmission in optical communication and for state manipulation and coherent superposition in quantum information processing. This technology can used as an emerging tool in optical communication and quantum information processing with entangled photons.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112626"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Roughness prediction in hatched laser scanning polishing based on critical spatial frequency","authors":"Junjie Wan,&nbsp;Liang Liang","doi":"10.1016/j.optlastec.2025.112668","DOIUrl":"10.1016/j.optlastec.2025.112668","url":null,"abstract":"<div><div>In the study of laser polishing, the modeling of hatched laser scanning polishing, which must take into account the initial surface micro-morphology and scanning path simultaneously, is still a challenge. To address the problem, this paper presents an improved surface roughness prediction model based on spatial frequency analysis. The initial surface morphology was simplified into a micro-textured surface. And then A 3D FEA heat conduction model of the micro-texture in hatched laser scanning polishing was established to evaluate the melting depth and melting duration in the hatched scanning traces. Subsequently, based on the evaluated melting durations, the critical spatial frequency was calculated and the spatial spectrum of polished surface profile was evaluated. And thus, the profile and the average roughness <em>R</em>_a of the polished surface were determined by inverse Fourier transform. By comparing the predicted result with the measured surface roughness in hatched laser scanning polishing test, it indicates that the proposed model allows for accurate predictions of polished finish with predicted error range from −9.5 % to 8.9 %, which is much smaller than that of other traditional spatial frequency analysis model of laser polishing.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112668"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on post-impact loading of composite sandwich-structured batteries","authors":"Xiaochen Wang,&nbsp;Minghui Lu,&nbsp;Yingming Wang,&nbsp;Yuxiang Shang,&nbsp;Zhenkun Lei,&nbsp;Ruixiang Bai","doi":"10.1016/j.optlastec.2025.112637","DOIUrl":"10.1016/j.optlastec.2025.112637","url":null,"abstract":"<div><div>With the growing trends of electrification in the aerospace and automotive industries, the integration of lithium-ion batteries into composite materials offers a promising solution for extending range and reducing dependence on petroleum-based energy sources. This study investigates the mechanical behavior and electrochemical performance of composite sandwich-structured batteries, where batteries are embedded within foam sandwich panels, under varying levels of impact energy. Two sizes of foam sandwich-structured batteries were fabricated using Vacuum Assisted Resin Transfer Molding (VARTM) and subjected to impact tests. Digital Image Correlation (DIC) was employed to observe the strain fields during Compression After Impact (CAI) and Bending After Impact (BAI) loading, while X-ray Computed Tomography (CT) was used to examine delamination at the battery-core interface and internal damage within the composite. The results show that foam sandwich-structured batteries exhibit excellent impact resistance and maintain electrochemical performance post-impact. Innovatively, this study combines the assessment of both mechanical and electrochemical performance to reveal the post-impact residual performance of composite sandwich-structured batteries, with a particular focus on the interactions between the foam core, carbon fiber faces, and embedded battery. This research provides valuable theoretical and experimental insights for the design of integrated electrochemical energy storage systems for future applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112637"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of laser heat input on the corrosion mitigation of laser textured AISI 301LN steel in molten carbonate salts","authors":"Mohammad Rezayat ,&nbsp;Miguel Morales ,&nbsp;Mahmoud Moradi ,&nbsp;Antonio Mateo","doi":"10.1016/j.optlastec.2025.112692","DOIUrl":"10.1016/j.optlastec.2025.112692","url":null,"abstract":"<div><div>Laser Surface Texturing (LST) is a surface modification method to mitigate corrosion of the stainless steels by molten carbonate salts in the concentrated solar power (CSP) plants. In this work, for the first time, the influence of the laser-heat input on the corrosion resistance of AISI 301LN stainless steel is investigated. For this purpose, the effect of the laser power and scanning speed on the surface topography, phase transformation, microhardness, and corrosion behavior, of laser textured surfaces is evaluated in detail. AISI 301LN samples were immersed in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 600 °C for 500 h. The textured surface properties after LST and the oxide scales formed during corrosion tests were evaluated using microanalysis, microscopy and optical characterization techniques. The results revealed that the effectiveness of LST was improved by increasing the laser-heat input, reducing the scanning speed and increasing the laser power, which is supported by statistical analyses. Compared with an untreated surface, the sample treated with the maximum laser-heat input induced a phase shift from austenite (γ) to martensite (α’), resulting in a remarkable increase in microhardness as well as also significantly decreased the corrosion rate by 37 %. This trend maximized the chemisorption of organic compounds and favoured the homogeneous distribution of Fe-Mn-carbides at the oxide-scale surface formed during the corrosion process. In this way, denser protective oxide scales were formed by retaining Cr and Ni in the oxide layers, and reducing the Li diffusion through scales.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112692"},"PeriodicalIF":4.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic measurement of the critical power for self-focusing of femtosecond lasers in air","authors":"Bei Wang ,&nbsp;Tao Wei ,&nbsp;Jianghao Li ,&nbsp;Dongwei Li ,&nbsp;Lanzhi Zhang ,&nbsp;Yangjian Cai ,&nbsp;Zuoqiang Hao","doi":"10.1016/j.optlastec.2025.112670","DOIUrl":"10.1016/j.optlastec.2025.112670","url":null,"abstract":"<div><div>Femtosecond laser filamentation, characterized by unique nonlinear optical phenomena, has a wide range of applications, including air lasing, air waveguides, and free-space optical communication. The critical power for self-focusing is a key parameter in this process; however, existing measurement methods are often limited by factors such as versatility and practicality. In this study, we introduce a newly developed acoustic technique using a cell phone to determine the critical power for self-focusing of femtosecond Gaussian and vortex beams in air. By analyzing the peak intensity<!--> <!-->and spatial integral of acoustic signals along the laser propagation path<!--> <!-->as a function of incident laser energy, we successfully measured<!--> <!-->the critical powers for self-focusing of both laser beam types. The technique offers several advantages, including simplicity, cost-effectiveness, high sensitivity, immunity to background light, and robustness in noisy environments. Our results suggest<!--> <!-->that acoustic diagnostics can be a viable alternative to traditional optical methods for studying laser filamentation, particularly in challenging environments.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112670"},"PeriodicalIF":4.6,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"VWC-LSPF: Voxelized weighted centroid least squares plane fitting based on point cloud data","authors":"Jiaxing Luo ,&nbsp;Lidong Ma ,&nbsp;Ruiqin Cui ,&nbsp;Yanbiao Ren","doi":"10.1016/j.optlastec.2025.112665","DOIUrl":"10.1016/j.optlastec.2025.112665","url":null,"abstract":"<div><div>Plane fitting in point cloud data processing plays a crucial role in various domains, particularly in smart cities and autonomous driving applications. Efficient plane fitting methods enable the accurate extraction and representation of geometric features in complex environments, providing essential support for urban infrastructure management, traffic flow analysis, and environmental monitoring. However, current plane fitting methods tend to underperform in the presence of noise and sparse data. These techniques often struggle to process point cloud data effectively in high-noise environments, leading to decreased fitting accuracy and impacting the reliability of downstream applications. In this paper, a novel plane fitting algorithm based on voxelization, weighted centroid computation, and least squares has been proposed for the above problem, termed Voxelized Weighted Centroid Least Squares Plane Fitting (VWC-LSPF). Initially, we voxelize the point cloud data using an Axis-Aligned Bounding Box (AABB), which divides point clouds into uniformly sized voxel grids. Subsequently, the initial centroids of all points within each voxel are calculated and normalized to determine the distance between each point and its centroid. A modified Sigmoid function, which is based on the normalized distances, is then employed to update the centroid weights iteratively until the weights converge, thereby mitigating the influence of noise and distant points and enhancing the robustness of the fitting process. Finally, all the weighted centroids are aggregated and fitted using the least squares method to minimize the sum of squared distances between the centroids and the fitted plane. The effectiveness of the proposed VWC-LSPF algorithm is validated through experiments based on LiDAR scanning of steel plate surfaces, each containing an average of 1.6 million points. Comparative analysis with traditional methods such as Least Squares, RANSAC, LMEDS, and MSAC, as well as current state-of-the-art denoising methods and implicit surface methods, shows that VWC-LSPF performs well in terms of accuracy, robustness, and computational efficiency under various noise conditions. The experimental results show that our algorithm maintains the root mean square error (RMSE) below 0.2 and maintains the coefficient of determination (<span><math><msup><mi>R</mi><mn>2</mn></msup></math></span>) value over 0.92, which verifies the exceptional robustness in complex environments. VWC-LSPF provides an improved least squares fitting solution, particularly adapted for scenarios with significant noise and outliers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112665"},"PeriodicalIF":4.6,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Visualization of particle micro-rotations and strain (force) chain in granular materials using three-dimensional electronic speckle pattern interferometry","authors":"Minyang Wu ,&nbsp;Fujun Yang ,&nbsp;Hanyang Jiang ,&nbsp;Yinhang Ma ,&nbsp;Weiran Cao ,&nbsp;Xiangyang Xu ,&nbsp;Xiaoyuan He","doi":"10.1016/j.optlastec.2025.112642","DOIUrl":"10.1016/j.optlastec.2025.112642","url":null,"abstract":"<div><div>Photoelasticity can be used for visualization to quantify the internal stresses within particles in a granular material. However, most granular materials are opaque in the visible spectrum or not optically-sensitive materials. It is critical limitation to the research is put on few choice of testing material. In this paper, three-dimensional electronic speckle pattern interferometry(3D ESPI) is developed and proven to give new insights on the spatial repartition of minute rotation and deformations in granular materials. By use of numerical differential method, the strain chain can be further evaluated and visualized in granular particles. The detail of the test system and how to determine the particles rotation and deformation is introduced and a few measurements have been performed and demonstrate the implementation of the method.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112642"},"PeriodicalIF":4.6,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}