Pub Date : 2026-06-01Epub Date: 2026-02-14DOI: 10.1016/j.optlastec.2026.114929
Kuo Yang, Ruihuan Wu, Weiyi Hong, Hongzhan Liu
A novel method for generating short microwave pulse trains based on a coupled signal mode-locked optoelectronic oscillator (CML-OEO) is proposed and experimentally demonstrated. In the proposed system, a coupled signal composed of two square-wave signals serves as the mode-locking signal to periodically manipulate the intracavity gain of the OEO. The pulse width of the output pulse trains can be flexibly adjusted by tuning the phase difference between the square-wave signals. This mechanism provides a means for effective pulse compression. The experimental results indicate that CML-OEO generates short microwave pulse trains with a repetition frequency of 195.005 kHz through fundamental frequency mode locking. Compared to the traditional active mode-locked optoelectronic oscillator, the CML-OEO achieves pulse compression effects of 73.0%.
{"title":"Generation of short microwave pulse trains based on coupled signal mode-locked optoelectronic oscillator","authors":"Kuo Yang, Ruihuan Wu, Weiyi Hong, Hongzhan Liu","doi":"10.1016/j.optlastec.2026.114929","DOIUrl":"10.1016/j.optlastec.2026.114929","url":null,"abstract":"<div><div>A novel method for generating short microwave pulse trains based on a coupled signal mode-locked optoelectronic oscillator (CML-OEO) is proposed and experimentally demonstrated. In the proposed system, a coupled signal composed of two square-wave signals serves as the mode-locking signal to periodically manipulate the intracavity gain of the OEO. The pulse width of the output pulse trains can be flexibly adjusted by tuning the phase difference between the square-wave signals. This mechanism provides a means for effective pulse compression. The experimental results indicate that CML-OEO generates short microwave pulse trains with a repetition frequency of 195.005 kHz through fundamental frequency mode locking. Compared to the traditional active mode-locked optoelectronic oscillator, the CML-OEO achieves pulse compression effects of 73.0%.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114929"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192022","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}
Pub Date : 2026-06-01Epub Date: 2026-02-13DOI: 10.1016/j.optlastec.2025.114644
Yicong Feng , Yuning Wang , Jian Zhou , Xiaoming Nie , Shuo Sun , Jin Li , Bin Zhang
The self-mixing interference (SMI) is an emerging sensing technology, which has the advantages of self-collimation and high sensitivity. However, current theoretical analyses of SMI are mostly based on semiconductor laser, while there are relatively few analyses based on solid-state laser especially 532 nm solid-state laser. Simultaneously, the resolution of SMI is easily affected by laser noise and environmental perturbation. In this paper, the theoretical model of SMI based on a 532 nm solid-state laser is established by rotating vector addition model. And a noise suppression method with dual electro-optic modulation is proposed. Experiments show that the self-mixing interferometry constructed with a 532 nm solid-state laser and dual electro-optical crystals can resolve the square wave motions with a peak-to-peak value less than 10 nm, and the short-term resolution is better than 1 nm. Moreover, the system can accurately reconstruct sinusoidal vibrations with peak-to-peak values from 10 to 5000 nm, vibrations with extremely weak feedback light, and non-sinusoidal vibrations.
{"title":"Micro-vibration measurement using self-mixing interferometry with an intracavity frequency-doubling solid-state laser","authors":"Yicong Feng , Yuning Wang , Jian Zhou , Xiaoming Nie , Shuo Sun , Jin Li , Bin Zhang","doi":"10.1016/j.optlastec.2025.114644","DOIUrl":"10.1016/j.optlastec.2025.114644","url":null,"abstract":"<div><div>The self-mixing interference (SMI) is an emerging sensing technology, which has the advantages of self-collimation and high sensitivity. However, current theoretical analyses of SMI are mostly based on semiconductor laser, while there are relatively few analyses based on solid-state laser especially 532 nm solid-state laser. Simultaneously, the resolution of SMI is easily affected by laser noise and environmental perturbation. In this paper, the theoretical model of SMI based on a 532 nm solid-state laser is established by rotating vector addition model. And a noise suppression method with dual electro-optic modulation is proposed. Experiments show that the self-mixing interferometry constructed with a 532 nm solid-state laser and dual electro-optical crystals can resolve the square wave motions with a peak-to-peak value less than 10 nm, and the short-term resolution is better than 1 nm. Moreover, the system can accurately reconstruct sinusoidal vibrations with peak-to-peak values from 10 to 5000 nm, vibrations with extremely weak feedback light, and non-sinusoidal vibrations.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114644"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192017","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}
Pub Date : 2026-06-01Epub Date: 2026-02-06DOI: 10.1016/j.optlastec.2026.114875
Muyang Ye , Zhennan Tian , Boyan Jiang , Lefeng Ye , Xiaoling Liu , Yongjie Zhao , Gongyu Liu , Haohua Xiu , Hao Nan Li
This paper introduces an innovative wedge-prism-based 2D laser scanning optomechanical system, complemented by an inverse kinematic algorithm that revolutionizes the manufacturing of irregularly shaped trajectories. Based on inverse kinematic analysis of laser beam transmission trajectories, our model presents a novel approach to precisely control the focused laser spot within a two-wedge system. Initially, we utilize image recognition to capture the contour of the desired machining trajectory, transforming it into processing point coordinates. The transition to a polar coordinate system streamlines calculations, allowing for accurate determination of the wedges’ rotational positions at each stage of the machining process. We conduct comparative analyses of various machining results, discussing their implications in relation to experimental outcomes, all grounded in optimization strategies for processing points. A standout feature of our study is the elimination of the need for additional motion control modules, enabling seamless integration of optical equipment into existing helical drilling systems. This integration not only reduces overall system costs but also significantly enhances processing efficiency and effectiveness in creating micro holes and intricately shaped structures. Our findings pave the way for more versatile and efficient laser machining solutions in advanced manufacturing applications.
{"title":"A novel wedges-based laser optomechanical system 2D motion control inverse kinematic algorithm","authors":"Muyang Ye , Zhennan Tian , Boyan Jiang , Lefeng Ye , Xiaoling Liu , Yongjie Zhao , Gongyu Liu , Haohua Xiu , Hao Nan Li","doi":"10.1016/j.optlastec.2026.114875","DOIUrl":"10.1016/j.optlastec.2026.114875","url":null,"abstract":"<div><div>This paper introduces an innovative wedge-prism-based 2D laser scanning optomechanical system, complemented by an inverse kinematic algorithm that revolutionizes the manufacturing of irregularly shaped trajectories. Based on inverse kinematic analysis of laser beam transmission trajectories, our model presents a novel approach to precisely control the focused laser spot within a two-wedge system. Initially, we utilize image recognition to capture the contour of the desired machining trajectory, transforming it into processing point coordinates. The transition to a polar coordinate system streamlines calculations, allowing for accurate determination of the wedges’ rotational positions at each stage of the machining process. We conduct comparative analyses of various machining results, discussing their implications in relation to experimental outcomes, all grounded in optimization strategies for processing points. A standout feature of our study is the elimination of the need for additional motion control modules, enabling seamless integration of optical equipment into existing helical drilling systems. This integration not only reduces overall system costs but also significantly enhances processing efficiency and effectiveness in creating micro holes and intricately shaped structures. Our findings pave the way for more versatile and efficient laser machining solutions in advanced manufacturing applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114875"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192286","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}
Pub Date : 2026-06-01Epub Date: 2026-02-10DOI: 10.1016/j.optlastec.2026.114838
Houxiao Wang , Jilong Li , Wuhong Xin
More and more structural members have been fabricated by using the premium aluminum alloy 7075 (AA7075) because of its excellent properties such as ultra high strength and very high specific strength. However, the AA7075 is a difficult-to-clad material, which usually can not meet the harsh long-term service requirements for the corrosive environments and/or under the wear working conditions. Accordingly, in this study, the novel FeAl50CrNi composite powder, which is the Fe-Al based alloy cladding powder properly mixed by SS304, Fe60 and Al with a recommended weight percent ratio of 2:3:5, is first reported based on the composition ratio design, comparison and proper selection. Assisted by preheating and heat preservation, the FeAl50CrNi composite powder was utilized for carrying out laser cladding experiments on the AA7075 plate surfaces via altering key laser parameters. It was indicated that the challenging problems (e.g., serious occurrence of cracks and pores, incomplete melt, slag entrapment, as well as poor interface fusion and joining) usually encountered during laser cladding for aluminum alloys were concurrently well solved by using the newly-developed composite cladding powder, as well as preferred defocus distance of −5 mm, focal spot diameter of 4.5 mm, and laser power of 1600 W. That is to say, the high-quality FeAl50CrNi composite coatings, which were well melted, mixed, fused and then metallurgically and reliably bound onto the AA7075 plate surfaces, were successfully achieved nearly without cladding defects by using laser cladding in this work. As compared to the AA7075 substrate, the wear resistance and corrosion resistance of laser cladded high-quality FeAl50CrNi composite coatings were improved concurrently and effectively by using a proper laser power of 1600 W. Such improvements achieved were reported in terms of a maximum micro hardness improvement of 116.67%, an averaged friction coefficient reduction of 31.43%, a wear loss reduction of 77.66% during half an hour, and a reduction of 31.23% in corrosion current density. As demonstrated, as a result of the notable alterations in terms of the effective energy inputs, laser fluences, heating–cooling rates and element diffusion, the microstructure characteristics notably altered from the coating top to the fusion zone inside the laser cladded area. Interestingly, these internal coating microstructure changes were characterized primarily by means of the dispersively distributed acicular Fe-Al intermetallic compounds (coating top), the dispersively distributed tiny second phase particles (coating middle), and the fine equiaxed and columnar grains (fusion zone). Importantly, such microstructure characteristics made the coatings possess the overall good mechanical performance in strength, ductility and toughness, micro hardness, wear resistance and corrosion resistance.
{"title":"Laser cladding of crack-free reliably-joined FeAl50CrNi composite coatings with minimized porosity and improved microstructure to notably enhance electrochemical corrosion plus wear resistance for aluminum alloy 7075 plate surfaces","authors":"Houxiao Wang , Jilong Li , Wuhong Xin","doi":"10.1016/j.optlastec.2026.114838","DOIUrl":"10.1016/j.optlastec.2026.114838","url":null,"abstract":"<div><div>More and more structural members have been fabricated by using the premium aluminum alloy 7075 (AA7075) because of its excellent properties such as ultra high strength and very high specific strength. However, the AA7075 is a difficult-to-clad material, which usually can not meet the harsh long-term service requirements for the corrosive environments and/or under the wear working conditions. Accordingly, in this study, the novel FeAl50CrNi composite powder, which is the Fe-Al based alloy cladding powder properly mixed by SS304, Fe60 and Al with a recommended weight percent ratio of 2:3:5, is first reported based on the composition ratio design, comparison and proper selection. Assisted by preheating and heat preservation, the FeAl50CrNi composite powder was utilized for carrying out laser cladding experiments on the AA7075 plate surfaces via altering key laser parameters. It was indicated that the challenging problems (e.g., serious occurrence of cracks and pores, incomplete melt, slag entrapment, as well as poor interface fusion and joining) usually encountered during laser cladding for aluminum alloys were concurrently well solved by using the newly-developed composite cladding powder, as well as preferred defocus distance of −5 mm, focal spot diameter of 4.5 mm, and laser power of 1600 W. That is to say, the high-quality FeAl50CrNi composite coatings, which were well melted, mixed, fused and then metallurgically and reliably bound onto the AA7075 plate surfaces, were successfully achieved nearly without cladding defects by using laser cladding in this work. As compared to the AA7075 substrate, the wear resistance and corrosion resistance of laser cladded high-quality FeAl50CrNi composite coatings were improved concurrently and effectively by using a proper laser power of 1600 W. Such improvements achieved were reported in terms of a maximum micro hardness improvement of 116.67%, an averaged friction coefficient reduction of 31.43%, a wear loss reduction of 77.66% during half an hour, and a reduction of 31.23% in corrosion current density. As demonstrated, as a result of the notable alterations in terms of the effective energy inputs, laser fluences, heating–cooling rates and element diffusion, the microstructure characteristics notably altered from the coating top to the fusion zone inside the laser cladded area. Interestingly, these internal coating microstructure changes were characterized primarily by means of the dispersively distributed acicular Fe-Al intermetallic compounds (coating top), the dispersively distributed tiny second phase particles (coating middle), and the fine equiaxed and columnar grains (fusion zone). Importantly, such microstructure characteristics made the coatings possess the overall good mechanical performance in strength, ductility and toughness, micro hardness, wear resistance and corrosion resistance.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114838"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192648","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}
Pub Date : 2026-06-01Epub Date: 2026-02-05DOI: 10.1016/j.optlastec.2026.114820
Jiachen Guo , Benyu Zhang , Zhifang Xu , Lina Bi , Shuang Li , Yueyan Shi , Liang Zhou , Shiqing Zhou , Jiaqi Zhang
This work presents an experimental demonstration of a high-sensitivity optical fiber sensor based on a calcium alginate (CaAlg)-functionalized single mode–tapered multimode–single mode (STMS) structure for humidity and pressure monitoring. By employing a tapered multimode fiber (TMF) to enhance the interaction with the evanescent field and integrating a biocompatible CaAlg film with excellent hygroscopic properties, the sensor achieves high sensitivity for detecting both humidity and pressure. The sensor demonstrates a humidity sensitivity of 0.315 dBm/%RH in optical power and 0.225 nm/%RH in wavelength shift over the 30 %–70 % RH range, with response and recovery times of 0.42 s and 0.2 s, respectively. For pressure sensing, the sensor exhibits an ultra-high sensitivity of 91.48 dBm/kPa within the 0–0.25 kPa range. Additionally, the sensor was tested at 50 % and 70 % RH for 120 min, with standard deviations of 0.2622 and 0.6327, respectively. The relative error at most only 0.0067 indicating the sensor’s high repeatability and reliability. The fabrication process is simple, environmentally friendly, and suitable for health monitoring applications. This work presents a promising approach for the development of multifunctional, miniaturized, and high-resolution fiber-optic sensors, with potential applications in wearable devices, healthcare monitoring, and soft robotics.
{"title":"High-performance humidity and pressure sensor based on STMS fiber structure coated with Ca-alginate hydrogel","authors":"Jiachen Guo , Benyu Zhang , Zhifang Xu , Lina Bi , Shuang Li , Yueyan Shi , Liang Zhou , Shiqing Zhou , Jiaqi Zhang","doi":"10.1016/j.optlastec.2026.114820","DOIUrl":"10.1016/j.optlastec.2026.114820","url":null,"abstract":"<div><div>This work presents an experimental demonstration of a high-sensitivity optical fiber sensor based on a calcium alginate (CaAlg)-functionalized single mode–tapered multimode–single mode (STMS) structure for humidity and pressure monitoring. By employing a tapered multimode fiber (TMF) to enhance the interaction with the evanescent field and integrating a biocompatible CaAlg film with excellent hygroscopic properties, the sensor achieves high sensitivity for detecting both humidity and pressure. The sensor demonstrates a humidity sensitivity of 0.315 dBm/%RH in optical power and 0.225 nm/%RH in wavelength shift over the 30 %–70 % RH range, with response and recovery times of 0.42 s and 0.2 s, respectively. For pressure sensing, the sensor exhibits an ultra-high sensitivity of 91.48 dBm/kPa within the 0–0.25 kPa range. Additionally, the sensor was tested at 50 % and 70 % RH for 120 min, with standard deviations of 0.2622 and 0.6327, respectively. The relative error at most only 0.0067 indicating the sensor’s high repeatability and reliability. The fabrication process is simple, environmentally friendly, and suitable for health monitoring applications. This work presents a promising approach for the development of multifunctional, miniaturized, and high-resolution fiber-optic sensors, with potential applications in wearable devices, healthcare monitoring, and soft robotics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114820"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116768","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}
Pub Date : 2026-06-01Epub Date: 2026-02-11DOI: 10.1016/j.optlastec.2026.114887
Tian-Hao Zhou , Ru-Meng Zhao , Zheng-Xin Yu , Xin Yan , Ji-Tao Li , Chao-Qing Dai
Although physics-informed neural network (PINN) exhibit strong generalization and adaptability to physical constraints in solving nonlinear evolutional equations, their performance remains limited in accuracy and convergence efficiency when dealing with nonlinear Schrödinger equation (NLSE) featuring strong nonlinear coupling and non-Hermitian characteristics. This paper proposes an enhanced PINN framework that integrates a Quadratic Residual Network (QRes) with a reinforcement learning (RL)-based adaptive sampling strategy for high-precision prediction of soliton evolution in the (1 + 1)-dimensional PT-symmetric competing cubic–quintic saturable NLSE. The QRes architecture strengthens the network’s nonlinear mapping capability, enabling more accurate fitting of complex field evolution induced by the interplay of cubic–quintic competing nonlinearity, saturable correction, and PT-symmetric complex potential, while maintaining controllable network depth. The RL-based sampling strategy adaptively adjusts the sampling point distribution according to training errors, emphasizing regions with high gradients around soliton peaks and gain/loss balance, thereby enhancing the model’s learning of localized dynamical features. Numerical predictions of symmetric dipole, asymmetric, and symmetric tripole solitons demonstrate that the proposed method achieves markedly superior relative accuracy, convergence speed, and training stability compared with conventional PINN and sampling approaches such as Latin hypercube sampling and residual-based adaptive refinement with distance. This work provides a new pathway for extending PINN to complex optical and nonlinear wave systems.
{"title":"Predicting PT-symmetric solitons in competing cubic–quintic saturable medium via enhanced PINN with quadratic residual and reinforcement learning-based sampling","authors":"Tian-Hao Zhou , Ru-Meng Zhao , Zheng-Xin Yu , Xin Yan , Ji-Tao Li , Chao-Qing Dai","doi":"10.1016/j.optlastec.2026.114887","DOIUrl":"10.1016/j.optlastec.2026.114887","url":null,"abstract":"<div><div>Although physics-informed neural network (PINN) exhibit strong generalization and adaptability to physical constraints in solving nonlinear evolutional equations, their performance remains limited in accuracy and convergence efficiency when dealing with nonlinear Schrödinger equation (NLSE) featuring strong nonlinear coupling and non-Hermitian characteristics. This paper proposes an enhanced PINN framework that integrates a Quadratic Residual Network (QRes) with a reinforcement learning (RL)-based adaptive sampling strategy for high-precision prediction of soliton evolution in the (1 + 1)-dimensional PT-symmetric competing cubic–quintic saturable NLSE. The QRes architecture strengthens the network’s nonlinear mapping capability, enabling more accurate fitting of complex field evolution induced by the interplay of cubic–quintic competing nonlinearity, saturable correction, and PT-symmetric complex potential, while maintaining controllable network depth. The RL-based sampling strategy adaptively adjusts the sampling point distribution according to training errors, emphasizing regions with high gradients around soliton peaks and gain/loss balance, thereby enhancing the model’s learning of localized dynamical features. Numerical predictions of symmetric dipole, asymmetric, and symmetric tripole solitons demonstrate that the proposed method achieves markedly superior relative accuracy, convergence speed, and training stability compared with conventional PINN and sampling approaches such as Latin hypercube sampling and residual-based adaptive refinement with distance. This work provides a new pathway for extending PINN to complex optical and nonlinear wave systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114887"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192185","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}
Pub Date : 2026-06-01Epub Date: 2026-02-11DOI: 10.1016/j.optlastec.2026.114858
Qi Jiang , Yao Gao , Shaohua Gao , Zhonghua Yi , Xiaolong Qian , Hao Shi , Kailun Yang , Lei Sun , Kaiwei Wang , Jian Bai
Emerging universal Computational Aberration Correction (CAC) paradigms provide an inspiring solution to lightweight and high-quality imaging with a universal model trained on a lens library (LensLib) to address arbitrary lens optical aberrations blindly. However, the limited coverage of existing LensLibs leads to poor generalization of the trained models to unseen lenses, whose fine-tuning pipeline is also confined to the lens-descriptions-known case. In this work, we introduce OmniLens, a flexible solution to universal CAC via (i) establishing a convincing LensLib with comprehensive coverage for pre-training a robust base model, and (ii) adapting the model to any specific lens designs with unknown lens descriptions via fast LensLib-to-specific domain adaptation. To achieve these, an Evolution-based Automatic Optical Design (EAOD) pipeline is proposed to generate a rich variety of lens samples with realistic aberration behaviors. Then, we design an unsupervised regularization term for efficient domain adaptation on a few easily accessible real-captured images based on the statistical observation of dark channel priors in degradation induced by lens aberrations. Extensive experiments demonstrate that the LensLib generated by EAOD effectively develops a universal CAC model with strong generalization capabilities, which can also improve the non-blind lens-specific methods by 0.351.81dB in PSNR. Additionally, the proposed domain adaptation method significantly improves the base model, especially in severe aberration cases (at most 2.59dB in PSNR). The code and data will be available at https://github.com/zju-jiangqi/OmniLens.
{"title":"OmniLens: Towards universal lens aberration correction via LensLib-to-specific domain adaptation","authors":"Qi Jiang , Yao Gao , Shaohua Gao , Zhonghua Yi , Xiaolong Qian , Hao Shi , Kailun Yang , Lei Sun , Kaiwei Wang , Jian Bai","doi":"10.1016/j.optlastec.2026.114858","DOIUrl":"10.1016/j.optlastec.2026.114858","url":null,"abstract":"<div><div>Emerging universal Computational Aberration Correction (CAC) paradigms provide an inspiring solution to lightweight and high-quality imaging with a universal model trained on a lens library (LensLib) to address arbitrary lens optical aberrations blindly. However, the limited coverage of existing LensLibs leads to poor generalization of the trained models to unseen lenses, whose fine-tuning pipeline is also confined to the lens-descriptions-known case. In this work, we introduce <em>OmniLens</em>, a flexible solution to universal CAC via (i) establishing a convincing LensLib with comprehensive coverage for pre-training a robust base model, and (ii) adapting the model to any specific lens designs with unknown lens descriptions via fast LensLib-to-specific domain adaptation. To achieve these, an Evolution-based Automatic Optical Design (EAOD) pipeline is proposed to generate a rich variety of lens samples with realistic aberration behaviors. Then, we design an unsupervised regularization term for efficient domain adaptation on a few easily accessible real-captured images based on the statistical observation of dark channel priors in degradation induced by lens aberrations. Extensive experiments demonstrate that the LensLib generated by EAOD effectively develops a universal CAC model with strong generalization capabilities, which can also improve the non-blind lens-specific methods by 0.35<span><math><mrow><mo>∼</mo></mrow></math></span>1.81dB in PSNR. Additionally, the proposed domain adaptation method significantly improves the base model, especially in severe aberration cases (at most 2.59dB in PSNR). The code and data will be available at <span><span>https://github.com/zju-jiangqi/OmniLens</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114858"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192174","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}
Pub Date : 2026-06-01Epub Date: 2026-02-10DOI: 10.1016/j.optlastec.2026.114902
Shanshan Chen , Rujia Wang , Kailiang Mao , Zhe Hu , Bin Wang , Jing Lv , Wenwu Zhang
Nickel-based alloys are of paramount importance for components operating at high temperatures within heavy-duty gas turbines. This study explores the potential of a quasi-continuous wave (QCW) fiber laser in the drilling of high-aspect-ratio holes in these materials. An anti-spatter coating composed of emery and silicone was developed to suppress molten material redeposition and improve hole quality. Furthermore, a polygonal percussion drilling method was introduced to address challenges associated with drilling thick, high-aspect-ratio holes. A systematic comparison was conducted among four drilling methods: percussion drilling, trepanning drilling, N-sided polygon drilling, and a hybrid method combining polygonal percussion drilling with trepanning drilling. The findings demonstrated that percussion drilling effectively controls heat accumulation, producing microholes with uniform profiles, minimal taper, low roughness, and a thin recast layer, capable of machining microholes with a diameter of less than 0.5 mm, an aspect ratio of 29, and a taper of 0.08°. In contrast, trepanning drilling generated straight hole walls but suffered from higher roughness and greater thermal damage. N-sided polygon drilling achieved clean surfaces with minimal taper but exhibited pronounced wall flaring and the thickest recast layer. The hybrid method offers a balanced performance profile and is particularly well-suited for larger-diameter holes characterized by a high aspect ratio of 11 and a very low taper angle of 0.27°. Microstructural analysis of deep holes produced by the hybrid method revealed depth-dependent variations in recast layer thickness and distinct evolutionary patterns in the peri-hole microstructure. EBSD analysis was performed on the upper, middle, and lower sections of the hole to map crystallographic changes. Combined with hardness testing, these analyses elucidated a strong correlation between grain morphology and localized hardness variations.
{"title":"High-aspect-ratio microhole drilling in MAR-M247 superalloy using a quasi-CW fiber laser","authors":"Shanshan Chen , Rujia Wang , Kailiang Mao , Zhe Hu , Bin Wang , Jing Lv , Wenwu Zhang","doi":"10.1016/j.optlastec.2026.114902","DOIUrl":"10.1016/j.optlastec.2026.114902","url":null,"abstract":"<div><div>Nickel-based alloys are of paramount importance for components operating at high temperatures within heavy-duty gas turbines. This study explores the potential of a quasi-continuous wave (QCW) fiber laser in the drilling of high-aspect-ratio holes in these materials. An anti-spatter coating composed of emery and silicone was developed to suppress molten material redeposition and improve hole quality. Furthermore, a polygonal percussion drilling method was introduced to address challenges associated with drilling thick, high-aspect-ratio holes. A systematic comparison was conducted among four drilling methods: percussion drilling, trepanning drilling, N-sided polygon drilling, and a hybrid method combining polygonal percussion drilling with trepanning drilling. The findings demonstrated that percussion drilling effectively controls heat accumulation, producing microholes with uniform profiles, minimal taper, low roughness, and a thin recast layer, capable of machining microholes with a diameter of less than 0.5 mm, an aspect ratio of 29, and a taper of 0.08°. In contrast, trepanning drilling generated straight hole walls but suffered from higher roughness and greater thermal damage. N-sided polygon drilling achieved clean surfaces with minimal taper but exhibited pronounced wall flaring and the thickest recast layer. The hybrid method offers a balanced performance profile and is particularly well-suited for larger-diameter holes characterized by a high aspect ratio of 11 and a very low taper angle of 0.27°. Microstructural analysis of deep holes produced by the hybrid method revealed depth-dependent variations in recast layer thickness and distinct evolutionary patterns in the peri-hole microstructure. EBSD analysis was performed on the upper, middle, and lower sections of the hole to map crystallographic changes. Combined with hardness testing, these analyses elucidated a strong correlation between grain morphology and localized hardness variations.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114902"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192328","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}
Pub Date : 2026-06-01Epub Date: 2026-02-06DOI: 10.1016/j.optlastec.2026.114874
Guangpei Lin , Guangyuan Yu , Zhaobing Cai , Le Gu , Zhen Dong , Peng Zhang , Qiwei Wang , Jun Wang , Xingchen Yan , Bingwen Lu
This study employs picosecond ultrafast lasers to prepare laser surface textures (LST) on WC-Ni composite coatings prepared by laser cladding. It systematically investigates the effects of laser power and scanning speed on texture morphology, dimensional characteristics, and ablation mechanisms. Furthermore, the improvement of coating tribological properties by LST was evaluated. The results indicate that texture diameter and depth increase with higher laser power but decrease with faster scanning speed, and the longitudinal dimensions (depth) exhibiting greater sensitivity to parameter variations. By combining response surface methodology (RSM) and ablation simulation reveals that texture morphology can be precisely controlled by adjusting power and scanning speed, and the scanning speed significantly affects dimensional characteristics. The material removal mechanism is primarily dominated by phase explosion-induced vaporization, accompanied by plasma plume ejection. Morphological analysis reveals that the original phase structure of the coating can be preserved while effectively removing material under complete ablation conditions, and nanoscale features can be induced. Tribological testing indicates that compared to the untextured coating (LST-0), the textured coating (LST-5) prepared using optimized parameters exhibits a reduction of approximately 21.5% in the average coefficient of friction and 34% in the wear rate under large loads. This is primarily attributed to the textured pits capturing wear debris to form a stable solid lubrication layer, while effectively isolating hard particles, significantly suppressing three-body wear. This study provides a systematic theoretical basis and process window for picosecond laser surface texturing of metal-ceramic composite coatings, confirming its effectiveness and application potential in enhancing wear resistance.
{"title":"Effect of process parameters on the dimension and morphology of laser cladded WC-Ni composite coatings prepared by picosecond laser surface texturing","authors":"Guangpei Lin , Guangyuan Yu , Zhaobing Cai , Le Gu , Zhen Dong , Peng Zhang , Qiwei Wang , Jun Wang , Xingchen Yan , Bingwen Lu","doi":"10.1016/j.optlastec.2026.114874","DOIUrl":"10.1016/j.optlastec.2026.114874","url":null,"abstract":"<div><div><strong>T</strong>his study employs picosecond ultrafast lasers to prepare laser surface textures (LST) on WC-Ni composite coatings prepared by laser cladding. It systematically investigates the effects of laser power and scanning speed on texture morphology, dimensional characteristics, and ablation mechanisms. Furthermore, the improvement of coating tribological properties by LST was evaluated. The results indicate that texture diameter and depth increase with higher laser power but decrease with faster scanning speed, and the longitudinal dimensions (depth) exhibiting greater sensitivity to parameter variations. By combining response surface methodology (RSM) and ablation simulation reveals that texture morphology can be precisely controlled by adjusting power and scanning speed, and the scanning speed significantly affects dimensional characteristics. The material removal mechanism is primarily dominated by phase explosion-induced vaporization, accompanied by plasma plume ejection. Morphological analysis reveals that the original phase structure of the coating can be preserved while effectively removing material under complete ablation conditions, and nanoscale features can be induced. Tribological testing indicates that compared to the untextured coating (LST-0), the textured coating (LST-5) prepared using optimized parameters exhibits a reduction of approximately 21.5% in the average coefficient of friction and 34% in the wear rate under large loads. This is primarily attributed to the textured pits capturing wear debris to form a stable solid lubrication layer, while effectively isolating hard particles, significantly suppressing three-body wear. This study provides a systematic theoretical basis and process window for picosecond laser surface texturing of metal-ceramic composite coatings, confirming its effectiveness and application potential in enhancing wear resistance.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114874"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192327","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}
Pub Date : 2026-06-01Epub Date: 2026-02-06DOI: 10.1016/j.optlastec.2026.114898
Xingchen Guo, Zhigang Dong, Renke Kang, Shang Gao
The surface quality of yttrium aluminum garnet (YAG) can directly affect its damage threshold. Photochemical mechanical polishing (PCMP) is a promising method to improve the processing efficiency of YAG. However, the mechanism by which UV affects processing efficiency is unclear. This paper comprehensively investigates the mechanism by which UV affects the chemical reaction rate and processing efficiency in PCMP of YAG. The effects of factors on surface roughness, morphology, and material removal rate were analyzed through a series of experiments. The chemical reaction rate was characterized by oxidation–reduction potential (ORP). Theoretically, the optimal parameters were obtained by investigating UV distribution characteristics and their effective irradiation region. The results indicate that increasing the UV intensity and irradiation area can promote processing efficiency. Under optimal conditions, the material removal rate can be increased by 29%, and the surface roughness can be decreased by 37%, resulting in a smoother surface. The above findings provide a new approach and theoretical basis for further enhancing the processing performance of PCMP.
{"title":"The mechanism of UV-induced efficient chemical reaction rate and processing efficiency in photochemical mechanical polishing of yttrium aluminum garnet","authors":"Xingchen Guo, Zhigang Dong, Renke Kang, Shang Gao","doi":"10.1016/j.optlastec.2026.114898","DOIUrl":"10.1016/j.optlastec.2026.114898","url":null,"abstract":"<div><div>The surface quality of yttrium aluminum garnet (YAG) can directly affect its damage threshold. Photochemical mechanical polishing (PCMP) is a promising method to improve the processing efficiency of YAG. However, the mechanism by which UV affects processing efficiency is unclear. This paper comprehensively investigates the mechanism by which UV affects the chemical reaction rate and processing efficiency in PCMP of YAG. The effects of factors on surface roughness, morphology, and material removal rate were analyzed through a series of experiments. The chemical reaction rate was characterized by oxidation–reduction potential (ORP). Theoretically, the optimal parameters were obtained by investigating UV distribution characteristics and their effective irradiation region. The results indicate that increasing the UV intensity and irradiation area can promote processing efficiency. Under optimal conditions, the material removal rate can be increased by 29%, and the surface roughness can be decreased by 37%, resulting in a smoother surface. The above findings provide a new approach and theoretical basis for further enhancing the processing performance of PCMP.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"198 ","pages":"Article 114898"},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192324","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}
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