Optics and Laser Technology最新文献

英文中文

Effect of residual oxygen content in reduced pressure laser beam welding of AZ31 magnesium alloy AZ31 镁合金减压激光束焊接中残余氧含量的影响

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112590

Yumo Jiang , Meng Jiang , Xi Chen , Lijun Yang , Jie Wang , Zhe Wang , Xuan Su , Peng He , Yanbin Chen

Reduced pressure laser welding is known to provide enhanced penetration depth and reduced defects. The effect of atmospheric pressure on the weld formation and physical process of laser welding has been well investigated, while the effect of atmospheric composition is rarely reported. In this work, the effect of residual oxygen content in reduced pressure laser beam welding of magnesium alloy was systematically investigated. The experimental results showed the residual oxygen content in the low vacuum had a significant effect on the weld formation of magnesium alloy. With the residual oxygen content increase from 0.297 to 29.7 mg/L under the reduced pressure of 10 kPa, the penetration depth of laser welds of magnesium alloy increases while the weld width decreases. The humps and discontinuous weld formation were observed when the oxygen content was higher than 11.9 mg/L. Molten pool behaviors and interaction of laser and plasma plume for different residual oxygen contents was experimentally and theoretically studied. The spatter occurred accompanied with the oxidation film for the high oxygen content. The large droplet was dragged back to the molten pool. It gradually grew up with the continuous large energy absorbed and then solidified in the oxide film, leading to the hump defects. Besides, the welding plume was gradually suppressed and the condensation particles increased with the decrease of the oxygen content. The residual oxygen content also has an obvious effect on the size and distribution of the condensed metal particles in the plasma plume. The interaction between laser and the plasma plume are the main reason which results in the change of weld formation of different residual oxygen content.

{"title":"Effect of residual oxygen content in reduced pressure laser beam welding of AZ31 magnesium alloy","authors":"Yumo Jiang , Meng Jiang , Xi Chen , Lijun Yang , Jie Wang , Zhe Wang , Xuan Su , Peng He , Yanbin Chen","doi":"10.1016/j.optlastec.2025.112590","DOIUrl":"10.1016/j.optlastec.2025.112590","url":null,"abstract":"<div><div>Reduced pressure laser welding is known to provide enhanced penetration depth and reduced defects. The effect of atmospheric pressure on the weld formation and physical process of laser welding has been well investigated, while the effect of atmospheric composition is rarely reported. In this work, the effect of residual oxygen content in reduced pressure laser beam welding of magnesium alloy was systematically investigated. The experimental results showed the residual oxygen content in the low vacuum had a significant effect on the weld formation of magnesium alloy. With the residual oxygen content increase from 0.297 to 29.7 mg/L under the reduced pressure of 10 kPa, the penetration depth of laser welds of magnesium alloy increases while the weld width decreases. The humps and discontinuous weld formation were observed when the oxygen content was higher than 11.9 mg/L. Molten pool behaviors and interaction of laser and plasma plume for different residual oxygen contents was experimentally and theoretically studied. The spatter occurred accompanied with the oxidation film for the high oxygen content. The large droplet was dragged back to the molten pool. It gradually grew up with the continuous large energy absorbed and then solidified in the oxide film, leading to the hump defects. Besides, the welding plume was gradually suppressed and the condensation particles increased with the decrease of the oxygen content. The residual oxygen content also has an obvious effect on the size and distribution of the condensed metal particles in the plasma plume. The interaction between laser and the plasma plume are the main reason which results in the change of weld formation of different residual oxygen content.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112590"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422537","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}

引用次数: 0

Effect of laser specific energy on microstructure and properties of Nano-TiC/15-5PH composite coatings on 17-4PH by laser cladding 激光比能量对激光熔覆 17-4PH 纳米 TiC/15-5PH 复合涂层微观结构和性能的影响

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112598

Yanbin Du , Hongxi Chen , Xin Lei , Wensheng Ma , Jian Tu

Laser specific energy is a critical parameter that reflects the energy efficiency of laser cladding, directly influencing the microstructure and mechanical properties of the composite coatings. To enhance the wear resistance of 17-4PH stainless steel and ensure its applicability in industrial settings, the nano-TiC/15-5PH composite coatings were prepared on 17-4PH stainless steel by laser cladding to strengthen the surface. The effect of laser specific energy on the phase composition, microstructure, microhardness, and wear resistance of composite coatings was systematically investigated by varying either the laser power or the scanning speed. The optimal process parameters corresponding to laser specific energy were identified to achieve enhanced wear resistance for the composite coating. The results show that the composite coatings are mainly composed of α-Fe, (Fe, Ni), (Fe, Ni)₂₃C₆ and TiC. The composite coatings exhibit a similar microstructure at varying laser specific energies, with the dendrites gradually becoming finer from the bottom to the top. Furthermore, both the average friction coefficient and microhardness of the composite coatings exhibit an initial increase followed by a decrease as laser specific energy rose. The maximum hardness achieved is 445.64 ± 3.8 HV_0.5, representing a 1.2-times increase compared to 17-4PH stainless steel. Specifically at a laser specific energy of 200 J/mm², with a corresponding laser power of 2000 W and a scanning speed of 5 mm/s, the average friction coefficient and wear volume reached their minimum values at 0.2629 and 27.458 × 10^-5 mm³. The composite coating demonstrated optimal wear resistance characteristics.

{"title":"Effect of laser specific energy on microstructure and properties of Nano-TiC/15-5PH composite coatings on 17-4PH by laser cladding","authors":"Yanbin Du , Hongxi Chen , Xin Lei , Wensheng Ma , Jian Tu","doi":"10.1016/j.optlastec.2025.112598","DOIUrl":"10.1016/j.optlastec.2025.112598","url":null,"abstract":"<div><div>Laser specific energy is a critical parameter that reflects the energy efficiency of laser cladding, directly influencing the microstructure and mechanical properties of the composite coatings. To enhance the wear resistance of 17-4PH stainless steel and ensure its applicability in industrial settings, the nano-TiC/15-5PH composite coatings were prepared on 17-4PH stainless steel by laser cladding to strengthen the surface. The effect of laser specific energy on the phase composition, microstructure, microhardness, and wear resistance of composite coatings was systematically investigated by varying either the laser power or the scanning speed. The optimal process parameters corresponding to laser specific energy were identified to achieve enhanced wear resistance for the composite coating. The results show that the composite coatings are mainly composed of α-Fe, (Fe, Ni), (Fe, Ni)<sub>23</sub>C<sub>6</sub> and TiC. The composite coatings exhibit a similar microstructure at varying laser specific energies, with the dendrites gradually becoming finer from the bottom to the top. Furthermore, both the average friction coefficient and microhardness of the composite coatings exhibit an initial increase followed by a decrease as laser specific energy rose. The maximum hardness achieved is 445.64 ± 3.8 HV<sub>0.5</sub>, representing a 1.2-times increase compared to 17-4PH stainless steel. Specifically at a laser specific energy of 200 J/mm<sup>2</sup>, with a corresponding laser power of 2000 W and a scanning speed of 5 mm/s, the average friction coefficient and wear volume reached their minimum values at 0.2629 and 27.458 × 10<sup>-5</sup> mm<sup>3</sup>. The composite coating demonstrated optimal wear resistance characteristics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112598"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422539","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}

引用次数: 0

Single-frequency continuous-wave solid-state 363.8-nm ultraviolet source generation by frequency tripling of a 1091-nm fiber laser

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112611

Zhenshuai Wei , Fengtian Li , Shaojie Men , Lu Huang , Zhigang Zhao , Zhenhua Cong , Zhaojun Liu

A single-frequency continuous-wave (CW) ultraviolet (UV) solid-state source at 363.8 nm has been demonstrated through the frequency tripling of a high-power, single-frequency, linearly-polarized (LP) 1091-nm laser. This 1091-nm laser, which features a homemade single-frequency distributed Bragg reflector (DBR) seed and can deliver 78-W average power with an optical signal-to-noise ratio (OSNR) exceeding 63 dB and a polarization extinction ratio (PER) of ∼ 15.8 dB. Employing two cascaded periodically poled Mg-doped lithium niobate (PPMgLN) crystals, whose lengths are 30 mm and 20 mm, a single-frequency 545.5-nm source with an average power of 1.85 W and a single-frequency 363.8-nm source with an average power of higher than 20 mW were obtained, when the input power of the 1091-nm laser was just 11.78 W. To the best of our knowledge, this is the first single-frequency solid-state UV source at 363.8 nm, which is usually provided by argon-ion gas laser, thus offering a potential alternative for semiconductor chip inspection applications.

{"title":"Single-frequency continuous-wave solid-state 363.8-nm ultraviolet source generation by frequency tripling of a 1091-nm fiber laser","authors":"Zhenshuai Wei , Fengtian Li , Shaojie Men , Lu Huang , Zhigang Zhao , Zhenhua Cong , Zhaojun Liu","doi":"10.1016/j.optlastec.2025.112611","DOIUrl":"10.1016/j.optlastec.2025.112611","url":null,"abstract":"<div><div>A single-frequency continuous-wave (CW) ultraviolet (UV) solid-state source at 363.8 nm has been demonstrated through the frequency tripling of a high-power, single-frequency, linearly-polarized (LP) 1091-nm laser. This 1091-nm laser, which features a homemade single-frequency distributed Bragg reflector (DBR) seed and can deliver 78-W average power with an optical signal-to-noise ratio (OSNR) exceeding 63 dB and a polarization extinction ratio (PER) of ∼ 15.8 dB. Employing two cascaded periodically poled Mg-doped lithium niobate (PPMgLN) crystals, whose lengths are 30 mm and 20 mm, a single-frequency 545.5-nm source with an average power of 1.85 W and a single-frequency 363.8-nm source with an average power of higher than 20 mW were obtained, when the input power of the 1091-nm laser was just 11.78 W. To the best of our knowledge, this is the first single-frequency solid-state UV source at 363.8 nm, which is usually provided by argon-ion gas laser, thus offering a potential alternative for semiconductor chip inspection applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112611"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422546","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}

引用次数: 0

Learning with limited annotations: Deep semi-supervised learning paradigm for layer-wise defect detection in laser powder bed fusion

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112586

Kunpeng Tan, Jiafeng Tang, Zhibin Zhao, Chenxi Wang, Xingwu Zhang, Huihui Miao, Xuefeng Chen

Powder bed quality is critical to the quality of parts manufactured by laser powder bed fusion (LPBF) and mass production. Recently, numerous powder bed defect detection methods based on semantic segmentation algorithms have been developed. However, these data-driven approaches face the indispensable challenge of insufficient annotated data. Especially in the context of defect segmentation in Additive Manufacturing (AM), pixel-wise image labeling is time-consuming and demands substantial prior knowledge. Semi-supervised Learning (SSL) can leverage unlabeled data to enhance the training process of deep learning models. During the layer-by-layer forming process in LPBF, thousands of powder bed images can be obtained but most of them remain unused because of the lack of annotations, which fully satisfy the situation with semi-supervised learning. To address the above issue, this paper proposes a deep semi-supervised learning-based paradigm for powder bed defect segmentation, allowing model learning with limited annotated data. Concretely, the proposed paradigm generates pseudo-labels for unlabeled data, enabling the utilization of a substantial amount of unlabeled data in the manufacturing process. Aiming at the issue of low-quality pseudo-labels generated from low-quality unlabeled data, we employ Mean Teacher Framework to separate the generation of pseudo-labels. Moreover, aiming at the lack of data diversity, we employ Consistency Regularization to enhance the model’s generalization performance. Additionally, we created a dataset comprising 406 images of powder-bed defects, with each image annotated at the pixel level. Extensive experiments on the dataset have shown the proposed paradigm’s effectiveness over supervised methods, even with limited labeled data (only 1/8 annotated).

{"title":"Learning with limited annotations: Deep semi-supervised learning paradigm for layer-wise defect detection in laser powder bed fusion","authors":"Kunpeng Tan, Jiafeng Tang, Zhibin Zhao, Chenxi Wang, Xingwu Zhang, Huihui Miao, Xuefeng Chen","doi":"10.1016/j.optlastec.2025.112586","DOIUrl":"10.1016/j.optlastec.2025.112586","url":null,"abstract":"<div><div>Powder bed quality is critical to the quality of parts manufactured by laser powder bed fusion (LPBF) and mass production. Recently, numerous powder bed defect detection methods based on semantic segmentation algorithms have been developed. However, these data-driven approaches face the indispensable challenge of insufficient annotated data. Especially in the context of defect segmentation in Additive Manufacturing (AM), pixel-wise image labeling is time-consuming and demands substantial prior knowledge. Semi-supervised Learning (SSL) can leverage unlabeled data to enhance the training process of deep learning models. During the layer-by-layer forming process in LPBF, thousands of powder bed images can be obtained but most of them remain unused because of the lack of annotations, which fully satisfy the situation with semi-supervised learning. To address the above issue, this paper proposes a deep semi-supervised learning-based paradigm for powder bed defect segmentation, allowing model learning with limited annotated data. Concretely, the proposed paradigm generates pseudo-labels for unlabeled data, enabling the utilization of a substantial amount of unlabeled data in the manufacturing process. Aiming at the issue of low-quality pseudo-labels generated from low-quality unlabeled data, we employ Mean Teacher Framework to separate the generation of pseudo-labels. Moreover, aiming at the lack of data diversity, we employ Consistency Regularization to enhance the model’s generalization performance. Additionally, we created a dataset comprising 406 images of powder-bed defects, with each image annotated at the pixel level. Extensive experiments on the dataset have shown the proposed paradigm’s effectiveness over supervised methods, even with limited labeled data (only 1/8 annotated).</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112586"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422527","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}

引用次数: 0

A temperature-insensitive graphene-water-based ultra-wideband terahertz metamaterials absorber designed using deep neural networks

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112591

Jing Li , Huanyang Chen , Seong Ling Yap , Binzhen Zhang

To address the limitations of traditional wave-absorbing materials in electromagnetic wave absorption, this study utilizes the electromagnetic properties of water and graphene in the terahertz (THz) band, coupled with deep neural networks (DNN), to propose a temperature-insensitive, ultra-wideband (UWB) THz metamaterials absorber (MAs). Simulation results show that when the graphene Fermi level is E_f = 0.9 eV, the absorber achieves an absorption rate exceeding 90 % over the 3.832 ∼ 9 THz frequency range. Analysis of the water-graphene composite structure reveals that the ultra-wideband absorption is primarily attributed to the coupling between the top-layer graphene and the dielectric water layer. A comprehensive investigation of the absorption mechanism is carried out using transmission line theory, impedance matching theory, and the analysis of field distribution and power loss. Moreover, the study demonstrates that adjusting the graphene Fermi level (0.01 ∼ 0.9 eV) enables flexible tuning of the absorber’s bandwidth and absorption performance. Additionally, the absorber remains stable across a temperature range of 0 ∼ 100 °C and exhibits wide-angle and polarization-insensitive absorption characteristics. With its simple structure, compact size, superior absorption performance, and tunability, this absorber shows great potential for applications in THz thermal imaging, radar stealth, smart switches, and electromagnetic radiation protection.

{"title":"A temperature-insensitive graphene-water-based ultra-wideband terahertz metamaterials absorber designed using deep neural networks","authors":"Jing Li , Huanyang Chen , Seong Ling Yap , Binzhen Zhang","doi":"10.1016/j.optlastec.2025.112591","DOIUrl":"10.1016/j.optlastec.2025.112591","url":null,"abstract":"<div><div>To address the limitations of traditional wave-absorbing materials in electromagnetic wave absorption, this study utilizes the electromagnetic properties of water and graphene in the terahertz (THz) band, coupled with deep neural networks (DNN), to propose a temperature-insensitive, ultra-wideband (UWB) THz metamaterials absorber (MAs). Simulation results show that when the graphene Fermi level is <em>E<sub>f</sub></em> = 0.9 eV, the absorber achieves an absorption rate exceeding 90 % over the 3.832 ∼ 9 THz frequency range. Analysis of the water-graphene composite structure reveals that the ultra-wideband absorption is primarily attributed to the coupling between the top-layer graphene and the dielectric water layer. A comprehensive investigation of the absorption mechanism is carried out using transmission line theory, impedance matching theory, and the analysis of field distribution and power loss. Moreover, the study demonstrates that adjusting the graphene Fermi level (0.01 ∼ 0.9 eV) enables flexible tuning of the absorber’s bandwidth and absorption performance. Additionally, the absorber remains stable across a temperature range of 0 ∼ 100 °C and exhibits wide-angle and polarization-insensitive absorption characteristics. With its simple structure, compact size, superior absorption performance, and tunability, this absorber shows great potential for applications in THz thermal imaging, radar stealth, smart switches, and electromagnetic radiation protection.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112591"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422545","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}

引用次数: 0

Effect of adding IN718 on crack inhibition, microstructure, and mechanical properties of selective laser melted IN738LC alloy 添加 IN718 对选择性激光熔化 IN738LC 合金的裂纹抑制、微观结构和机械性能的影响

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112600

Chunxue Wang , Guoqiang Huang , Zhenkui Liang , Xin Chen , Jianhui Wu , Tao Sun , Fanqiang Meng , Sergey Mironov , Jicheng Gao , Lin Zhao , Xiaomei Feng , Yifu Shen

Crack inhibition during additive manufacturing (AM) of superalloys with complex compositions is an important but challenging task. In this work, we explored the effectiveness of reducing the Al and Ti content by adding IN718 superalloy powders to realize crack suppression during selective laser melting (SLM) of IN738LC superalloy. The effect of IN718 superalloy powder addition on the crack formation, microstructure, and mechanical properties of the SLMed 738LC superalloy was investigated in detail. The results show that adding the IN718 superalloy powder can effectively inhibit the formation of cracks in the SLMed IN738LC superalloy while improving the mechanical properties. The SLMed IN718-25 % sample shows the best mechanical properties, with a tensile strength of 937 MPa and an elongation of 30.6 %. Also, its hardness distribution tends to be more uniform. The excellent mechanical properties are mainly attributed to the effective crack suppression by adding a certain percentage of IN718 to the IN738LC alloy. Our work provides a simple method to effectively inhibit crack formation during the AM process of nickel-based superalloys.

{"title":"Effect of adding IN718 on crack inhibition, microstructure, and mechanical properties of selective laser melted IN738LC alloy","authors":"Chunxue Wang , Guoqiang Huang , Zhenkui Liang , Xin Chen , Jianhui Wu , Tao Sun , Fanqiang Meng , Sergey Mironov , Jicheng Gao , Lin Zhao , Xiaomei Feng , Yifu Shen","doi":"10.1016/j.optlastec.2025.112600","DOIUrl":"10.1016/j.optlastec.2025.112600","url":null,"abstract":"<div><div>Crack inhibition during additive manufacturing (AM) of superalloys with complex compositions is an important but challenging task. In this work, we explored the effectiveness of reducing the Al and Ti content by adding IN718 superalloy powders to realize crack suppression during selective laser melting (SLM) of IN738LC superalloy. The effect of IN718 superalloy powder addition on the crack formation, microstructure, and mechanical properties of the SLMed 738LC superalloy was investigated in detail. The results show that adding the IN718 superalloy powder can effectively inhibit the formation of cracks in the SLMed IN738LC superalloy while improving the mechanical properties. The SLMed IN718-25 % sample shows the best mechanical properties, with a tensile strength of 937 MPa and an elongation of 30.6 %. Also, its hardness distribution tends to be more uniform. The excellent mechanical properties are mainly attributed to the effective crack suppression by adding a certain percentage of IN718 to the IN738LC alloy. Our work provides a simple method to effectively inhibit crack formation during the AM process of nickel-based superalloys.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112600"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422538","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}

引用次数: 0

Rethinking the approach to lightweight multi-branch heterogeneous image fusion frameworks: Infrared and visible image fusion via the parallel Mamba-KAN framework

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112612

Yichen Sun , Mingli Dong , Lianqing Zhu

The infrared and visible image fusion (IVIF) technique, as an important branch of image processing, has garnered significant attention due to its ability to capture thermal radiation features in low-light conditions and combine them with the rich detail and color information of visible images. However, challenges remain in this field, including the difficulty of balancing information from both modalities using homogenous fusion strategies and the increasing model complexity, which affects computational efficiency. To address these issues, we present an innovative lightweight IVIF framework based on the parallel Mamba-KAN (PMKFuse) model, featuring a multi-branch heterogeneous model design. By integrating our proposed multi-channel parallel cross-vision Mamba (PCVM) modules with parallel KAGtention (PKAGN) modules, our approach effectively extracts features at both global and local levels. This not only ensures high performance in image fusion tasks but also significantly reduces the number of model parameters. Additionally, a composite loss function is developed, integrating intensity, gradient, and feature decomposition losses to optimize the training process. The experimental results demonstrate that PMKFuse not only minimizes the number of model parameters but also outperforms the current state-of-the-art (SOTA) methods in both subjective visual evaluation and objective performance metrics for IVIF. These findings highlight the model’s effectiveness in improving fusion quality and its potential for wide-ranging practical applications, advancing the field of image processing. The codes are available at https://github.com/sunyichen1994/PMKFuse.

{"title":"Rethinking the approach to lightweight multi-branch heterogeneous image fusion frameworks: Infrared and visible image fusion via the parallel Mamba-KAN framework","authors":"Yichen Sun , Mingli Dong , Lianqing Zhu","doi":"10.1016/j.optlastec.2025.112612","DOIUrl":"10.1016/j.optlastec.2025.112612","url":null,"abstract":"<div><div>The infrared and visible image fusion (IVIF) technique, as an important branch of image processing, has garnered significant attention due to its ability to capture thermal radiation features in low-light conditions and combine them with the rich detail and color information of visible images. However, challenges remain in this field, including the difficulty of balancing information from both modalities using homogenous fusion strategies and the increasing model complexity, which affects computational efficiency. To address these issues, we present an innovative lightweight IVIF framework based on the parallel Mamba-KAN (PMKFuse) model, featuring a multi-branch heterogeneous model design. By integrating our proposed multi-channel parallel cross-vision Mamba (PCVM) modules with parallel KAGtention (PKAGN) modules, our approach effectively extracts features at both global and local levels. This not only ensures high performance in image fusion tasks but also significantly reduces the number of model parameters. Additionally, a composite loss function is developed, integrating intensity, gradient, and feature decomposition losses to optimize the training process. The experimental results demonstrate that PMKFuse not only minimizes the number of model parameters but also outperforms the current state-of-the-art (SOTA) methods in both subjective visual evaluation and objective performance metrics for IVIF. These findings highlight the model’s effectiveness in improving fusion quality and its potential for wide-ranging practical applications, advancing the field of image processing. The codes are available at <span><span>https://github.com/sunyichen1994/PMKFuse.</span><svg><path></path></svg></span></div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112612"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427936","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}

引用次数: 0

Plane segmentation from point clouds using the detail preserving optimal-vector-field

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-13 DOI: 10.1016/j.optlastec.2025.112580

Shenhong Li , Lin Zhang , Wanshou Jiang , Sander Oude Elberink

Plane segmentation in three dimensions is a crucial step for many applications. A recent optimal-vector-field (OVF) technique demonstrated good generality across a variety of models. However, OVF is a rough approach that results in under-segmentation and missing points due to loss of details. Hence, this paper presents a new plane segmentation method that uses the detail-preserving OVF method to address these problems. There are three improvements to our proposed segmentation method. (1) To enlarge the vector difference between points on different planes, we split the model into a set of planar primitives leveraging the fine planar primitives extraction method, and then estimate the normal of each point in the primitive as the vector field. (2) We define a point-based Laplace operator to improve the vector field optimization process, thereby enhancing the accuracy of OVF for detail detection. (3) We innovatively take the magnitude of optimal-vector-field as the criterion for planar primitive-based growth to obtain the final segmentation result. The evaluation of four datasets shows that our method achieves higher average precision and recall than the OVF method by 16.43% and 20.79% respectively, and the global consistency error (GCE) decreases by 6.62%. The evaluation indicates that our method is capable of preserving finer details.

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引用次数: 0

Design and application of transparent conductive films in the visible to short-wave infrared region: A review

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-13 DOI: 10.1016/j.optlastec.2025.112602

Shengyong Wang , Yongqiang Pan , Shuai Wen , Jijie Zhao , Yuxuan Du , Menglin Li , Mengcong Li , Shaojie Peng , Tao Ma , Huan Liu

Transparent conductive films are critical in numerous applications, including display technology, sensor technology, energy science, military technology, and biomedical applications. However, commercially available indium tin oxide (ITO) has several shortcomings that limit its practical use, such as indium scarcity, high deposition temperatures, mechanical fragility, and limited optical transmission bands. These issues hinder the development of infrared optoelectronic devices. Optimizing electrical conductivity while maintaining optical transparency from visible to Short-wave infrared wavelengths presents significant challenges. To fabricate broadband transparent conductive films, this paper summarizes two major research directions. First, optimizing traditional films involves compositional tuning, optimization of preparation parameters, and doping strategies to enhance film performance. Second, developing new materials, such as carbon nanomaterials, metal nanowires, and ultrathin metal films, is crucial. This paper also details emerging applications of these materials in broadband optoelectronic devices, such as electromagnetic shielding, photodetectors, and solar cells, and offers a forward-looking perspective on future development trends. Overall, this work provides a comprehensive review of recent advancements in broadband transparent conductive films across multiple aspects, including optimization, preparation, applications, and challenges.

{"title":"Design and application of transparent conductive films in the visible to short-wave infrared region: A review","authors":"Shengyong Wang , Yongqiang Pan , Shuai Wen , Jijie Zhao , Yuxuan Du , Menglin Li , Mengcong Li , Shaojie Peng , Tao Ma , Huan Liu","doi":"10.1016/j.optlastec.2025.112602","DOIUrl":"10.1016/j.optlastec.2025.112602","url":null,"abstract":"<div><div>Transparent conductive films are critical in numerous applications, including display technology, sensor technology, energy science, military technology, and biomedical applications. However, commercially available indium tin oxide (ITO) has several shortcomings that limit its practical use, such as indium scarcity, high deposition temperatures, mechanical fragility, and limited optical transmission bands. These issues hinder the development of infrared optoelectronic devices. Optimizing electrical conductivity while maintaining optical transparency from visible to Short-wave infrared wavelengths presents significant challenges. To fabricate broadband transparent conductive films, this paper summarizes two major research directions. First, optimizing traditional films involves compositional tuning, optimization of preparation parameters, and doping strategies to enhance film performance. Second, developing new materials, such as carbon nanomaterials, metal nanowires, and ultrathin metal films, is crucial. This paper also details emerging applications of these materials in broadband optoelectronic devices, such as electromagnetic shielding, photodetectors, and solar cells, and offers a forward-looking perspective on future development trends. Overall, this work provides a comprehensive review of recent advancements in broadband transparent conductive films across multiple aspects, including optimization, preparation, applications, and challenges.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112602"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394766","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}

引用次数: 0

Transient energy loss analysis in thermal Q-switching for high peak power narrow pulse lasers

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-12 DOI: 10.1016/j.optlastec.2025.112574

Peijin Shang , Daobin Luo , Shiyu Wang

Compact pulsed solid-state lasers have garnered significant interest for laser detection due to their high-power and narrow pulse-widths. However, thermal effects arising from uneven temperature distributions can degrade system performance, stability, and lifespan. This study shifts the focus from suppressing these effects to harnessing them, presenting a transient energy loss analysis to generate high-performance thermal Q-switched pulses, detailing for cavity stability and thermal Q-switch judgment. Experimental results demonstrate achievable pulses with a maximum peak power of 2.632 MW and a pulse width of 8.88 ns, highlighting the feasibility and efficiency of the proposed approach in advancing thermal Q-switched technology.

引用次数: 0

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