Optics and Laser Technology最新文献

{"title":"Laser cutting of alumina based Oxide-oxide ceramic matrix composites","authors":"Priyanka Ghosh,&nbsp;Joseph Nix,&nbsp;Helen Elkington,&nbsp;Kursad Sezer,&nbsp;Sundar Marimuthu","doi":"10.1016/j.optlastec.2025.113169","DOIUrl":"10.1016/j.optlastec.2025.113169","url":null,"abstract":"<div><div>Ceramic matrix composites comprising of alumina-based fibre and reinforcement (Ox-Ox CMCs) exhibit great potential for deployment in high-temperature applications, such as aero-engines and power generation gas turbines. This is due to their notable properties, such as light-weight, resistance to corrosion and oxidation, and high thermal tolerance. However, Ox-Ox CMCs are hard, and brittle, rendering them challenging to machine using conventional and non-conventional techniques. To gain insight into their laser machinability and material removal mechanisms, this study examines the influence of key process variables on cutting performance, surface roughness, and dross formation. The findings suggest that continuous wave fibre lasers can be used to achieve both high-quality and high-speed cutting of 5 mm-thick Ox-Ox CMCs while controlling surface roughness and minimising defects. The use of oxygen assist gas resulted in fusion-based cutting mechanics along with an improved surface finish compared to using compressed air or inert gases. The multi-pass cutting technique enhances melt ejection and reduces dross formation, promoting cleaner cuts.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113169"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084131","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":"High-power Hi1060-output 980 nm monolithic fiber laser using multi-cladding Yb-doped fiber for EDFA systems","authors":"Yonghui Luo,&nbsp;Haoyuan Liang,&nbsp;Wang Ju,&nbsp;Chang Shu,&nbsp;Junjie Cheng,&nbsp;Xiaoke Yin,&nbsp;Wenzhen Li,&nbsp;Le He,&nbsp;Haiqing Li,&nbsp;Jinggang Peng,&nbsp;Yingbin Xing,&nbsp;Nengli Dai,&nbsp;Jinyan Li","doi":"10.1016/j.optlastec.2025.113159","DOIUrl":"10.1016/j.optlastec.2025.113159","url":null,"abstract":"<div><div>To realize high-power, single-mode pump sources for high-transmission-capacity Er-doped fiber amplifier (EDFA) systems, a high-power 980 nm monolithic fiber laser with Hi1060-output is first demonstrated, to the best of our knowledge. With the help of the Hi1060-output fiber, the demonstrated 980 nm fiber laser is highly compatible with EDFA systems. A multi-cladding Yb-doped fiber (MC-YDF) with 20 μm core and 50 μm first cladding was fabricated by conventional fiber preparation technology to adjust the gain of 1030 nm amplified spontaneous emission and high-order mode for high optical-to-optical efficiency and beam quality. Under 29.4 W maximum pump power at 915 nm, a 9 W single-mode laser output with an O-O efficiency of 30.6 % was achieved. The output power fluctuation was measured at 0.5 % after 2 h of continuous operation.^{[email protected]}</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113159"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084134","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":"Selective laser-induced photothermal effect in a semiconductor-based nanocomposite for boosting the photocatalytic performance in degradation of organic pollutant","authors":"Juntao Tan ,&nbsp;Jiatong Liu ,&nbsp;Pengke Yu ,&nbsp;Yang Li ,&nbsp;Liang Sun ,&nbsp;Jiaming Li ,&nbsp;Xiangyou Li ,&nbsp;Qingmao Zhang","doi":"10.1016/j.optlastec.2025.113125","DOIUrl":"10.1016/j.optlastec.2025.113125","url":null,"abstract":"<div><div>In recent years, the laser-fabrication technology has attracted significant attention in processing the nanomaterials. Comparing with the conventional wet chemical routes and thermal annealing processing method, even though the relevant products can be well-prepared by using these methods, but the spherical nanomaterials widely used in photocatalytic fields, with neat surface and precisely controllable temperature are hard to realize. Laser technology enables the fabrication of nanospheres, which act as atomic clusters to expand the performance of functional semiconductors. In this work, an innovative approach is proposed to increase photogenerated carrier of g-C₃N₄. Under laser irradiation, g-C₃N₄ was successfully welded to Ag nanospheres, which was observed and confirmed using high-precision instruments. Additionally, a numerical simulation under typical liquid-phase conditions at the nanoscale is elaborated, and efficient heat generation under electromagnetic radiation is calculated. The surface temperature of the Ag nanoparticles was 1415 K. A Schottky barrier between Ag and g-C₃N₄ was naturally established, and the performance of the photogenerated charge carriers was effectively enhanced. Degradation of organic pollutants was carried out as a typical example to demonstrate the photogenerated carrier performance. The maximum reaction rate was accelerated by 14 times, and an increased Electron Paramagnetic Resonance (EPR) intensity of 1.8 times was obtained. The optimized photocatalytic mechanism was investigated. This work demonstrates an efficient approach for the precise construction of nanomaterials and provides a valuable way to optimize the photogenerated carrier performance of semiconductors.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113125"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084133","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":"SCMFusion: Semantic Constrained Multi-Scale Fusion Network for infrared and visible image fusion","authors":"Liuyan Shi ,&nbsp;Rencan Nie ,&nbsp;Jinde Cao ,&nbsp;Xuheng Liu ,&nbsp;Xiaoli Li","doi":"10.1016/j.optlastec.2025.113097","DOIUrl":"10.1016/j.optlastec.2025.113097","url":null,"abstract":"<div><div>Due to the distinct characteristics of infrared and visible images, we introduce Semantic Constrained Multi-Scale Fusion (SCMFusion) to balance unique and common features during infrared and visible image fusion (IVIF). This method reduces redundancy and comprehensively represents scenes captured by both modalities. Firstly, the semantic-constrained Frequency-Aware Bidirectional Pyramid (FABP) combines a spatial pyramid, which vertically keeps the channel unchanged and captures a larger receptive field through resolution reduction, with a channel pyramid, which preserves scale consistency and enriches feature expression through increased channels. Subsequently, the extracted features undergo Semantic-Constrained Cross-Modal Cross-Scale Fusion (SC-CCF) for effective information exchange and fusion. Next, the semantic constraints ensure pixel-wise alignment between fused features and original images, integrating modality-specific features and enhancing shared features. Finally, a Reconstruction Block (RB) processes high- and low-frequency components to produce the fused image. Comparative experiments demonstrate that our model outperforms 11 state-of-the-art (SOTA) fusion methods and achieves notable results in object detection.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113097"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084130","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":"A novel misalignment angle correction method for vibration measurement of a rotating structure using an image-based tracking continuously scanning laser Doppler vibrometer","authors":"L.F. Lyu,&nbsp;W.D. Zhu,&nbsp;D.T. Will,&nbsp;K. Yuan","doi":"10.1016/j.optlastec.2025.113155","DOIUrl":"10.1016/j.optlastec.2025.113155","url":null,"abstract":"<div><div>A novel misalignment angle correction method is developed for an image-based tracking continuously scanning laser Doppler vibrometer (CSLDV) for tracking and scanning a rotating structure with a large misalignment angle between its rotation axis and the optical axis of the camera in the tracking CSLDV. In the misalignment angle correction method, the rotation trajectory of the structure is considered as an ellipse due to projection in the captured images from the camera in the tracking CSLDV. Parameters of the ellipse, including the position of its center, the lengths of its semi-major axis and semi-minor axis, and the angular position of its major axis, are used to determine the misalignment angle and the endpoints of the scan paths on the rotating structure. Both the parallel projection and pinhole models are used to determine the misalignment angle for comparison. The position coordinates of the rotation center and ellipse center are different, which is considered in the misalignment angle correction method to determine accurate position coordinates of the rotating structure in the captured images. The estimated position coordinates of the end of the rotating structure in the elliptical trajectory are transformed into position coordinates in the circular rotation trajectory to reduce oscillations in the estimated rotation speeds. In the experimental investigation, an aluminum blade is attached to a hub on an aluminum frame and the frame is turned at different positions so that there are different misalignment angles of 0°, 10°, 20°, and 30° between the tracking CSLDV and the rotating blade. The blade rotates at a constant speed driven by a motor inside of the hub, and the blade is excited by air flow from a fan placed behind the rotating structure. The rotating blade with different misalignment angles is tracked and scanned by the tracking CSLDV and the measured responses are processed by the improved demodulation method to estimate the modal parameters, including the damped natural frequencies and undamped mode shapes. The estimated rotation speeds and modal parameters captured at various misalignment angles using the novel misalignment angle correction method are compared with each other. Further, the estimated rotation speeds and modal parameters captured using the novel misalignment angle correction method are compared with the results captured using the legacy method where angular misalignment and projection are not considered, where the novel misalignment angle correction method is shown to produce better measurement results.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113155"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084132","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":"ATCM-Net: A deep learning method for phase unwrapping based on perception optimization and learning enhancement","authors":"Min Xu ,&nbsp;Jia Cong ,&nbsp;Yuxin Shen ,&nbsp;Mingming Chen ,&nbsp;Vivi Tornari ,&nbsp;Ioannis Vezakis","doi":"10.1016/j.optlastec.2025.113185","DOIUrl":"10.1016/j.optlastec.2025.113185","url":null,"abstract":"<div><div>In electronic speckle pattern interferometry (ESPI), retrieving absolute phase from wrapped phase images captured by phase-shifting is challenging, especially for high speckle, greatly-variable density, discontinuities, and uneven background cases. These conditions are too complex for the common phase continuity assumption, and existing methods have limitations in phase retrieval. To address these limitations, we propose an approach enhancing phase unwrapping by compositing phase reconstruction, wrapped phase filtering, and wrap-count segmentation in one network architecture and training framework. We design a two-tasks coupling network (attention and transformer combined M network, ATCM-Net) using residual blocks, convolutional block attention modules, contextual transformers, dense blocks, and skip connections. We propose a composite loss function with reconstruction, filtering, and segmentation losses for effective training. We incorporate phase unwrapping theory into training to utilize prior information. We construct a dataset for phase unwrapping with the phase-shifting method, using realistic, varied samples sufficient for training. ATCM-Net is trained successfully with the proposed loss function on this dataset. We obtain the phase from wrapped phase effectively, without parameter fine-tuning or processing steps. We test our method on simulated and experimental samples, comparing it with existing methods and ATCM-Net trained by reconstruction and filtering loss. Performance is evaluated quantitatively and qualitatively for speckle reduction, retrieval accuracy, structure protection, and texture preservation. The results demonstrate our method’s superiority in phase retrieval, speckle reduction, structure protection, texture preservation, generalization, and batch performance on complex cases. Additionally, ATCM-Net shows good generalization when applied to phase retrieval in ESPI measurements and other technologies.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113185"},"PeriodicalIF":4.6,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083986","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":"High-precision weld width detection in laser transmission welding via crow and wolf optimized neural networks","authors":"Ning Jiang ,&nbsp;Rundong Qian ,&nbsp;Haiyu Qiao ,&nbsp;Chenyi Ni ,&nbsp;Yayun Liu ,&nbsp;Liquan Jiang ,&nbsp;Chuanyang Wang","doi":"10.1016/j.optlastec.2025.113211","DOIUrl":"10.1016/j.optlastec.2025.113211","url":null,"abstract":"<div><div>Laser transmission welding is widely used in the welding scene of highly transparent plastic parts. It could heat the surface of the lower layer through the upper welded parts, perform effective welding, and have a small heat-affected zone. However, due to the complexity and uncertainty of the welding process parameters, many defects will be generated in the welding, which will greatly reduce the quality of polymer welding. Based on the combination of artificial neural network (ANN) and optimization algorithm, this paper proposes a method to obtain high-precision weld width data through process parameters, so that the optimization of parameters can have a reliable prediction model and reduce trial and error experiments to obtain the most accurate parameter design.</div><div>First, a multi-layer perceptron model is designed to learn the nonlinear relationship between process parameters and weld width. The model can quickly predict the weld width in the welding result from the matching of parameters. Secondly, in order to improve the prediction accuracy of the model for weld width, a crow and wolf optimization algorithm based on gray wolf optimization is proposed. The algorithm is used to optimize hyperparameters in model, improve the performance of the model, and thus enable high-precision prediction. Finally, the model optimized by the new algorithm is compared with the models using other swarm intelligence algorithms. The experimental results show that the method proposed in this paper could predict the weld width with high accuracy, and the R² value is greater than 0.9.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113211"},"PeriodicalIF":4.6,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084129","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":"Multiarray digital coherent combing technology for real-time target speckle correction in heterodyne detection","authors":"Yutao Liu ,&nbsp;Xueting Dang ,&nbsp;Chenqing Wei ,&nbsp;Shuo Liu ,&nbsp;Shi Qiu ,&nbsp;Xinghu Fu","doi":"10.1016/j.optlastec.2025.113218","DOIUrl":"10.1016/j.optlastec.2025.113218","url":null,"abstract":"<div><div>The practical application of active laser heterodyne detection is significantly constrained by the decoherence effects induced by target speckles. Therefore, this study proposes a multiarray digital coherent combing method based on the sequential algorithm (SA) for real-time target speckle correction in heterodyne detection. Experiments show that the SA can compensate for phase differences between the array heterodyne signals without any prior knowledge, thereby achieving real-time and accurate compensation for target speckles. Thus, the proposed method contributes to the development of active laser heterodyne detection applications, such as synthetic aperture lidar, long-distance coherent lidar, and laser vibrometry.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113218"},"PeriodicalIF":4.6,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072758","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":"High figure of merit surface lattice resonance sensor based on double-layer inverted nano-crescent array","authors":"Lei Wang ,&nbsp;Qi Wang ,&nbsp;Xiang-Yu Yin ,&nbsp;Ai-Song Zhu","doi":"10.1016/j.optlastec.2025.113192","DOIUrl":"10.1016/j.optlastec.2025.113192","url":null,"abstract":"<div><div>Plasmonic nano-arrays provides a promising platform for optical devices due to the high degree of freedom in structural design. However, the broadening of full width at half maximum (FWHM) caused by high radiation loss in nanostructure limits its further application because it can only achieve very low quality factor (Q-factor) spectral response. Based on this, a novel double-layer inverted nano-crescent array structure which can excite surface lattice resonance (SLR) with high Q-factor is proposed in this paper. The SLR absorption peak with low radiation loss but low intensity will have better spectral characteristics because of spectral splitting caused by double-layer inverted crescent and the excitation of the out-of-plane mode. The out-of-plane mode is modulated by the height of nano-crescent. The increase of single-layer height can significantly enhance the SLR formed by the coupling between Z-directional electric field in free space and localized surface plasmon resonance; and the increase of multi-layer height can significantly enhance the weak SLR coupling peak dominated by waveguide mode. Both cases achieve FWHM of 10⁻² magnitude (minimum: 0.04 nm) and Q-factor of 10⁴ magnitude (33515.69) while increasing the absorption intensity. Further, the SLR sensor with ultra-high figure of merit (FOM) (22347.5 RIU⁻¹) is demonstrated. Compared with ordinary SLR sensors, the FOM has been improved by two orders of magnitude. This paper provides a new idea for the achievement of extremely narrow linewidth spectral response and the design of sensing structures with ultra-high FOM, further high FOM sensing will promote the development of trace substance detection technology.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113192"},"PeriodicalIF":4.6,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070264","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":"Static transverse magnetic field assisted laser cladding of nickel alloy GH3625 for enhancing its microstructure, microhardness, friction and wear properties on 304 stainless steel substrate","authors":"Zhou Shi ,&nbsp;Peng Xu ,&nbsp;Jingcun Bi ,&nbsp;Zhenyu Yao ,&nbsp;Rui Li ,&nbsp;Bolong Wang ,&nbsp;Hongyu Zheng","doi":"10.1016/j.optlastec.2025.113203","DOIUrl":"10.1016/j.optlastec.2025.113203","url":null,"abstract":"<div><div>At present, the microstructure and properties of laser-clad GH3625 alloy are mainly controlled by adjusting the cladding processing parameters. However, regulation of the fluid flow in the melt pool requires more than adjusting the laser cladding parameters alone, making it a significant challenge to control the cladding layer structure. In this study, an approach for enhancing the microstructure and properties of laser-cladded GH3625 on a non-magnetic 304 stainless steel substrate is investigated by applying an auxiliary static transverse magnetic field in the coaxial powder-feed cladding process. The magnetic field strength was varied between 0–200 mT. The macro-microstructure, elemental composition, phase structure, hardness and friction and wear properties of the cladding layer were analysed by SEM, EDS and XRD. The role and action mechanism of the applied static magnetic field in modulating the fluid flow of the melt pool were investigated. The electromagnetic braking and thermoelectric magnetic effects are discussed to for their influences on the melt pool formation and characteristics. Under the influence of electromagnetic braking, the molten pool morphology is regulated and the dilution rate of the cladding layer decreases. On the other hand, under the action of the static magnetic field, Seeback effect is generated causing thermoelectric circulation at the top of the dendrites, and resulting in thermoelectric magnetic force, which leads to irregular dendrite growth and promoted the grain refinement. The thermo-electric magnetic force strengthens the solute transport, and promotes the precipitation and uniform distribution of the strengthening phases such as the γ’ phase and carbides, and thereby enhancing the hardness and wear resistance of the cladding layer. At the magnetic induction intensity of 120 mT, the highest hardness and the lowest friction coefficient were obtained at 300 HV_0.2 and 0.34 respectively. Higher static magnetic field leads to higher thermo-electric magnetic force, and its blocking effect on grains becomes stronger and induces a large area of annular bands. The annular band structure becomes increasingly more significant in truncating the original phase. The content of Fe element in the cladding layer increases, resulting in Fe elemental segregation.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113203"},"PeriodicalIF":4.6,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070772","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}