Optics and Laser Technology最新文献

{"title":"Neural measurement method based on near-field photometric stereo with tangent estimation for machined metal surfaces","authors":"Xi Wang ,&nbsp;Hang Yuan ,&nbsp;ZhenXiong Jian ,&nbsp;Duo Li ,&nbsp;XinQuan Zhang ,&nbsp;LiMin Zhu ,&nbsp;MingJun Ren","doi":"10.1016/j.optlastec.2025.112643","DOIUrl":"10.1016/j.optlastec.2025.112643","url":null,"abstract":"<div><div>Machined metal surfaces exhibit non-Lambertian reflectance with complex highlight that dramatically undermines the performance of three-dimensional optical measurement methods. To address this problem, this study proposes a neural measurement method based on near-field photometric stereo to obtain accurate measurements of machined metal surfaces. A tangent estimation network is designed to enable the photometric stereo to suppress the effect of the anisotropic metal reflectance on the surface normal estimation. In addition, a projector is introduced into the photometric stereo system to output an initial point cloud that helps the network adapt to near-field scenes and rectify the error accumulation of normal integration. Synthetic experiments based on public anisotropic reflectance data demonstrate that the proposed photometric stereo network with tangent estimation improves the surface normal estimation accuracy of anisotropic metal reflectance surfaces. Real experiments based on eight machined metal surfaces demonstrate that the proposed neural measurement method obtains a measurement accuracy of 59 um compared with the measurement results of the coordinate measurement machines.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112643"},"PeriodicalIF":4.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643754","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":"Reducing the impact of optical power fluctuations in BOTDA using nonuniform probe compensation methods","authors":"Wei Zan ,&nbsp;Qing Bai ,&nbsp;Xinyi Liu ,&nbsp;Mingyuan Yang ,&nbsp;Yu Wang ,&nbsp;Baoquan Jin","doi":"10.1016/j.optlastec.2025.112829","DOIUrl":"10.1016/j.optlastec.2025.112829","url":null,"abstract":"<div><div>A nonuniform probe compensation method is proposed for gain spectrum calibration in the distributed Brillouin optical time-domain analyzer (BOTDA). Pseudo-random distributed power fluctuations are quantified by determining the slow-changing component from the Lorentzian fitting residuals of the raw gain spectrum and compensated. Experimental results indicate that the normalized Brillouin gain uncertainty is suppressed from 10.08 % to 0.24 %. The fitting coefficient between the Δ_BFS and temperature variation is improved to 0.9999, with the average fitting residual decreasing from 3.41 <!--> <!-->MHz to 0.27 <!--> <!-->MHz. The research demonstrates that the method effectively mitigates the impact of optical power instability, significantly improving BFS accuracy in BOTDA.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112829"},"PeriodicalIF":4.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642814","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":"Wide-field quantitative phase imaging without slicing via feature-domain Fourier ptychographic microscopy","authors":"Fannuo Xu ,&nbsp;Zhiping Wang ,&nbsp;Zipei Wu ,&nbsp;An Pan","doi":"10.1016/j.optlastec.2025.112727","DOIUrl":"10.1016/j.optlastec.2025.112727","url":null,"abstract":"<div><div>Quantitative phase imaging (QPI) is gaining significant recognition in the field of biological imaging due to its ability to accurately and non-invasively retrieve phase shifts within samples. Fourier ptychographic microscopy (FPM) is a high-resolution imaging technology commonly employed for QPI because of its capability to capture a vast field of view and recover phase information. Typically, FPM requires an initial image with a high signal-to-noise ratio. To address its theoretical constraints, the image is often divided into blocks for processing. This letter presents the implementation of a quantitative phase imaging method based on the recently introduced feature-domain Fourier ptychographic technique. The proposed method is designed to be robust against noise and eliminates the need for binning the original image. Compared with conventional methods, our approach demonstrates high performance and flexible recovery results in both simulations and experiments.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112727"},"PeriodicalIF":4.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643727","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":"Real-time defect monitoring in high-power laser-MAG hybrid welding with an improved multi attention mechanisms convolution transformer network","authors":"Yue Qiu ,&nbsp;Leshi Shu ,&nbsp;Minjie Song ,&nbsp;Shaoning Geng ,&nbsp;Yilin Wang ,&nbsp;Di Wu ,&nbsp;Deyuan Ma","doi":"10.1016/j.optlastec.2025.112735","DOIUrl":"10.1016/j.optlastec.2025.112735","url":null,"abstract":"<div><div>High-power laser-MAG hybrid welding (HPLMHW) offers good penetration and bridging ability for medium-thick plates. However, the instability of intense interaction between the dual heat sources and the weldment causes defects like root humping, with inadequately understood mechanisms and insufficient monitoring of defect types. Additionally, in HPLMHW monitoring, similarities among defects and intense periodic interference make it difficult to monitor accurately and adjust subsequent welding parameters. To address these issues, this research studies and defines the formations and types of root humping in HPLMHW, and proposes an improved transformer-based network for real-time monitoring of five weld types including diverse root humping defects. Firstly, the formation mechanism of diverse root humping in HPLMHW is revealed and diverse categories of root humping are defined. Next, using the established top-view monitoring platform, a dataset of five weld types including distinct root humping is constructed, differing from other welding monitoring studies. Then, the research proposed an enhanced convolutional transformer network for real-time defect monitoring in the mentioned HPLMHW process environment with intense noise interference, periodic objects overlap, and similar top-view formation processes of multi defects, named Sparse and Multi Attention Convolution Transformer Network (SMACTnet). SMACTnet combines sparse and multiple attention mechanisms within Transformer and CNN frameworks. It leverages the advantages of Transformers for global feature extraction and CNNs for local feature extraction, enhances defect class features, minimizes noise and periodic overlap interference, and improves monitoring accuracy. Comparison experiments on a test set of new welds demonstrate that the SMACTnet outperforms other models in overall performance and effectively monitors welds, including incomplete penetration, two types of root humping, surface collapse and well-formed.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112735"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631744","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":"Enhancement of total internal reflection in Nd:YAG crystals by multilayer nanostructured coatings","authors":"Lukas Ramalis ,&nbsp;Simas Melnikas ,&nbsp;Deividas Buinovskis ,&nbsp;Tomas Tolenis","doi":"10.1016/j.optlastec.2025.112807","DOIUrl":"10.1016/j.optlastec.2025.112807","url":null,"abstract":"<div><div>Total internal reflectance depends on the ratio of refractive indexes on each side of the interface. Enhancement of its angular range is challenging in YAG laser systems due to the low index of gain material. Therefore, we propose the nanoengineered multilayer stack of silica material formed by glancing angle deposition technique. Each layer of silica has lower refractive index material compared with YAG and it allows to reach total internal reflectance at the angles down to 46 degrees. Such coating design is also over-coated with dense multilayer which allows to connect it to the cooling system and gain favorable spectral performance at different angles.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112807"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631746","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 review on dissipative optical solitons: A route to photo-bot","authors":"Prashant Singh,&nbsp;K. Senthilnathan","doi":"10.1016/j.optlastec.2025.112647","DOIUrl":"10.1016/j.optlastec.2025.112647","url":null,"abstract":"<div><div>The article delves into the intriguing realm of soliton molecules in the dissipative systems where we initially discuss the formation of solitons in optical fibers and their fundamental dynamics within integrable models. It then sheds light on dissipative nonlinear optical cavities and fiber lasers, lauded as ideal testbeds for studying the complex and captivating dynamics of dissipative solitons. The review comprehensively examines research on dissipative optical dynamics, encompassing dissipative solitons, soliton molecules, complexes, and crystals. The article illuminates research on light bullets in nonlinear dissipative systems in the remarkable discovery of spatiotemporal soliton molecules and (3 + 1)D soliton crystals. Finally, it emphasizes how a deep understanding and control over the dynamics of soliton molecules could unlock the potential for optimizing “quasi-intelligence” within these intriguing light formations. Building upon the past and recent breakthroughs, we propose the concept of “Photo-bots” – intelligence in interacting solitons and soliton molecules, inspired by nanobots. In contrast to nanobots, which are physical machines interacting with molecules through physical or chemical means, photo-bots are highly controlled and localized light that could play an indispensable role at the quantum level and can modulate the quantum states of atoms and molecules and promises to have several other advanced applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112647"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of freeform off-axis telescope with low tilt-to-length noise based on construction method","authors":"Hao Tan ,&nbsp;Zichao Fan ,&nbsp;Huiru Ji ,&nbsp;Yan Mo ,&nbsp;Donglin Ma","doi":"10.1016/j.optlastec.2025.112821","DOIUrl":"10.1016/j.optlastec.2025.112821","url":null,"abstract":"<div><div>In this paper, we propose a design methodology for low tilt-to-length (TTL) noise freeform off-axis telescopes, aimed at enhancing performance in space-based gravitational wave (GW) detection. Our design integrates advanced freeform surfaces to reduce TTL noise and improve optical quality, which is crucial for the requirements of GW detection mission. The novelty of our approach lies in the construction method, which directly computes the optical parameters, enabling simultaneous consideration of wavefront error (WFE) and TTL noise. This contrasts traditional optimization methods, which often handle these aspects sequentially, leading to inefficiencies and potential increases in design time. By incorporating TTL noise considerations at the design stage, our method significantly enhances the predictability and efficiency of the telescope design process. Based on this method, we present an off-axis telescope design which demonstrates that the root-mean-square (RMS) wavefront error remains well within the requirements of GW detection missions across the scientific field of view (FOV), and the TTL noise is maintained below the threshold across a wide operational range. The RMS WFE of the designed system is lower than 0.0025λ within the scientific FOV of ±7μrad. The maximum TTL noise within FOV of ±300μrad is less than 0.025 nm/rad.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112821"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631745","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":"Manipulating nanoparticles by coupling wedge and plasmonic modes on non-uniformly biased graphene strips","authors":"Behnam Okhravi,&nbsp;Mostafa Ghorbanzadeh","doi":"10.1016/j.optlastec.2025.112815","DOIUrl":"10.1016/j.optlastec.2025.112815","url":null,"abstract":"<div><div>Realizing tunable high intensified and localized multiple hot spots are crucial for developing integrated optical tweezers in lab-on-a-chip devices to study interparticle interactions, routing and delivering nanoparticles. In this work, we utilize from a wedge-shaped Si structure to create and guide an extremely localized optical wedge mode and also as a non-uniform gate to non-uniformly control the chemical potential of topped graphene strips. Using three-dimensional finite-difference time-domain numerical method, we show that the wedge mode can excite localized surface plasmon (LSP) modes on the surface of each graphene strips with two distinct hot spots (trapping sites). The position of the trapping sites can be electrically manipulated <em>continuously</em> along the length of each graphene strip and <em>discretely</em> along the direction of propagation of the wedge mode by tuning the gate voltage. The calculated plasmonic forces by Maxwell stress tensor (MST) method reveals that 7 V change in the gate voltage leads to displacement of trapped particles by ∼ 49 nm. Moreover, we show that in the proposed structure by smoothly varying the gate voltage of graphene strips, active plasmonic focusing and defocusing lenses can be realized. We believe the proposed system can be implemented in lab-on-a-chip devices for electrically manipulating multiple nanoparticles without the need to use large scale expensive optical instruments.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112815"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631752","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":"An approach for improving the distorted structured light in holographic optical tweezers","authors":"Yida Song,&nbsp;Zhengshu Zhang,&nbsp;Yi Shen,&nbsp;Xionggui Tang","doi":"10.1016/j.optlastec.2025.112804","DOIUrl":"10.1016/j.optlastec.2025.112804","url":null,"abstract":"<div><div>Optical tweezers have been widely used for optical manipulation of various particles. At present, there are different type of optical tweezers. Among them, holographic optical tweezers have attracted growing attention as a powerful tools for optical trapping, optical transportation and optical sorting in many fields, due to its excellent properties including great flexibility and high convenience. Experimentally, however, the structured light has been easily distorted, which would lead to serious degradation of optical manipulation performance. In this work, the distortion of structured light is theoretically analyzed. In the following, the distortion of structured light are numerically simulated and experimentally measured. It shows that the simulated results are in consistent with the experimental ones. Then, an approach for decreasing its optical distortion is proposed, and the results reveal that the distortion of structured light can be effectively corrected. Accordingly, our study provides a way for improving the distorted structured light, which is useful for optically manipulating various particles in optical tweezers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112804"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642812","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":"Positive-feedback amplification of weak laser pulses","authors":"Yuanzhuang Bu ,&nbsp;Bin Zhang ,&nbsp;Jing Hou","doi":"10.1016/j.optlastec.2025.112828","DOIUrl":"10.1016/j.optlastec.2025.112828","url":null,"abstract":"<div><div>Pulsed fiber amplifiers are essential components of high-power pulsed fiber laser systems. To the best of our knowledge, we first propose a type of positive-feedback pulsed fiber amplifier to efficiently amplify weak laser pulses. Positive-feedback mechanism is actively established by the backward time-shifted superposition of seed pulses and feedback pulses. Since the greatly enhanced net input pulses can consume more excited particles to promote excited radiation and suppress spontaneous radiation, our positive-feedback pulsed fiber amplifier achieves a unique near-exponential growth in power curve, higher single-stage gain (17.4 dB, increase of 5.1 dB), and higher pump-to-signal conversion efficiency (19.1 %, increase of 14.6 %) than conventional pulsed fiber amplifiers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112828"},"PeriodicalIF":4.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642813","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}