Optics & Laser Technology最新文献_第2页

Rapid computer-generated hologram with lightweight local and global self-attention network 具有轻量级局部和全局自注意力网络的快速计算机生成全息图

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111740

Qingxiao Liu, Changchun Zhao, Fen Zhao, De Sun, Tingyu Zhao, Junan Zhang

{"title":"Rapid computer-generated hologram with lightweight local and global self-attention network","authors":"Qingxiao Liu, Changchun Zhao, Fen Zhao, De Sun, Tingyu Zhao, Junan Zhang","doi":"10.1016/j.optlastec.2024.111740","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111740","url":null,"abstract":"Computer-generated holography is a technique that utilizes computers and algorithms to generate holographic images. Deep learning-based Computer-generated holography can learn the mapping relationship between input images and holographic images, which offers faster computation speed and better image quality comparing with direct encoding and iterative optimization methods. However, most methods typically employ stacked convolutional layers to expand the receptive field, which leads to a sharp increase in computational cost as well as number of parameters. We proposed a rapid computer-generated holograms method with lightweight local and global self-attention networks (LGSANet), which performs phase encoding of input images as an alternative to the conventional holographic method for recording object information. Once the network training is completed, it is possible to perform high quality holograms with a spatial resolution of 1920 × 1080 within 39 ms. By importing the encoded phase of input images into a spatial light modulator (SLM), a clear reconstructed image can be obtained at the observation plane by irradiating the SLM with a reference light (@λ = 532 nm). Experimental results show the proposed method exhibits significant improvements in peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM), as well as reduced speckle noise, which can be applied to holographic displays, AR/VR, metasurface design, medical imaging, etc.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling of process parameters and wear performance investigation of Inconel 625 nickel-based coatings via laser cladding 通过激光熔覆 Inconel 625 镍基涂层的工艺参数建模和磨损性能研究

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111749

Yufeng Wu, Xuming Wu, Lincong Li, Bin Li, Zhaohui Wang

{"title":"Modeling of process parameters and wear performance investigation of Inconel 625 nickel-based coatings via laser cladding","authors":"Yufeng Wu, Xuming Wu, Lincong Li, Bin Li, Zhaohui Wang","doi":"10.1016/j.optlastec.2024.111749","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111749","url":null,"abstract":"In this study, laser cladding technology was employed to fabricate Inconel 625 coatings on the surface of 15CrMo alloy steel. The formation appearance, melt width, dilution rate, composition, microstructure, microhardness, and wear behavior of the coatings were investigated using X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness testing, wear testing machines, and laser confocal microscopy. Experimental results indicate that an optimal linear energy range of 10.8–14.4 W·min/mm and a powder feeding density range of 0.125–0.16 g/mm yield high-quality coatings with well-formed structures, refined grains, and enhanced microhardness. For the first time, the concept of powder feeding density was introduced. Based on the functional relationships between linear energy, powder feeding density, and coating characteristics, bead width and dilution rate models for Inconel 625 coatings were established, providing a theoretical basis for engineers to optimize the laser cladding process. Furthermore, friction and wear test results demonstrated that the coatings possess excellent wear resistance under optimal parameters, with the primary wear mechanisms being adhesive wear and oxidative wear.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser transmission welding of Poly(vinyl chloride) and polyamide 66 based on green femtosecond laser surface modification 基于绿色飞秒激光表面改性的聚氯乙烯和聚酰胺 66 激光透射焊接

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111737

Dongyang Wang, Minqiu Liu, Sizhi Xu, Jianxun Lu, Ying Zhang, Jianpang Zhai, Shuangchen Ruan, Deqin Ouyang, Chunbo Li

{"title":"Laser transmission welding of Poly(vinyl chloride) and polyamide 66 based on green femtosecond laser surface modification","authors":"Dongyang Wang, Minqiu Liu, Sizhi Xu, Jianxun Lu, Ying Zhang, Jianpang Zhai, Shuangchen Ruan, Deqin Ouyang, Chunbo Li","doi":"10.1016/j.optlastec.2024.111737","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111737","url":null,"abstract":"To improve the bonding strength of unweldable poly(vinyl chloride) (PVC) and polyamide 66 (PA66), a surface treatment method using green femtosecond laser (GFL) to modify PVC before welding was proposed in this study. The experiments of GFL surface modification, 1940 nm laser transmission welding (LTW), mechanical properties test and related characterization were carried out. The effects of GFL parameters on the physical and chemical properties of the modified surface and the bonding strength of the dissimilar joints were investigated in detail. The bonding mechanism of PVC/PA66 joints was analyzed comprehensively. The results showed that laser modification induced the deposition of many oxygen-containing functional groups on the PVC surface. These oxygen-containing functional groups form a highly polar modified layer on the surface, thereby improving the miscibility and welding performance of PVC/PA66. Finally, the modification and welding parameters were optimized based on the response surface methodology (RSM), and the maximum shear strength was 8.9 MPa.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface roughness evolution of 1Cr12Ni3MoVN alloy prepared by additive/subtractive hybrid manufacturing 添加剂/减量剂混合制造法制备的 1Cr12Ni3MoVN 合金的表面粗糙度演变

Optics & Laser Technology Pub Date : 2024-09-06 DOI: 10.1016/j.optlastec.2024.111743

Zhen Wang, Chunhuan Guo, Songchuan Shi, Zubin Chen, Guorui Jiang, Chuanming Liu, De Xu, Fengchun Jiang

{"title":"Surface roughness evolution of 1Cr12Ni3MoVN alloy prepared by additive/subtractive hybrid manufacturing","authors":"Zhen Wang, Chunhuan Guo, Songchuan Shi, Zubin Chen, Guorui Jiang, Chuanming Liu, De Xu, Fengchun Jiang","doi":"10.1016/j.optlastec.2024.111743","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111743","url":null,"abstract":"To improve the surface quality of samples manufactured by directed energy deposition (DED), the subtractive process is integrated with additive manufacturing, a method known as additive/subtractive hybrid manufacturing (ASHM). The correlation between the surface quality of the subtractive process and the process parameters of additive manufacturing has been established in this work. The results demonstrate that a high linear energy density can improve the surface quality of the subtractive process. To comprehensively analyze the mechanisms, field emission scanning electron microscopy and nanoindentation are employed to investigate the microstructure and mechanical behavior of the ASHMed specimens. It is observed that increasing linear energy density can strengthen the tempering effect on the previously deposited layer, thereby promoting the precipitation of MC (M=Mo) carbides along the grain boundary and reducing defects at the grain boundary. Furthermore, this enhancement reinforces the grain boundary strength, leading to a transition in the fracture mechanism from intergranular to transgranular fracture during the subtractive process. As a result, the surface roughness of ASHMed samples improves with increasing linear energy density. Additionally, the finite element simulation of the ASHM process was performed, demonstrating a close correspondence with experimental results, with an error margin of 6.30 %. In conclusion, the model described in this paper can predict the surface quality of the 1Cr12Ni3MoVN alloy fabricated by the ASHM.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Processing method of laser ranging data based on array of superconducting nanowire single photon detector 基于超导纳米线单光子探测器阵列的激光测距数据处理方法

Optics & Laser Technology Pub Date : 2024-09-06 DOI: 10.1016/j.optlastec.2024.111741

Hui Li, Tianlin Zhu, Xudong Lin, Chengkai Zhou, Peng Wang, Jiali Feng, Jinhao Wang, Xuan Wang, Xianlin Wu, Xida Han, Ming Li

引用次数: 0

Contrast enhancement algorithm for infrared images based on multiscale difference of morphological reconstruction 基于形态重建多尺度差异的红外图像对比度增强算法

Optics & Laser Technology Pub Date : 2024-09-06 DOI: 10.1016/j.optlastec.2024.111728

Yongsong Li, Zhengzhou Li, Abubakar Siddique, Yuchuan Liu

{"title":"Contrast enhancement algorithm for infrared images based on multiscale difference of morphological reconstruction","authors":"Yongsong Li, Zhengzhou Li, Abubakar Siddique, Yuchuan Liu","doi":"10.1016/j.optlastec.2024.111728","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111728","url":null,"abstract":"The visual interpretation of infrared images is often hindered by low contrast and a limited dynamic range. This poses a significant challenge as existing enhancement methods are often limited in their ability to simultaneously improve contrast, suppress noise, and effectively handle overexposed and underexposed regions. To overcome these limitations, this article presents a novel contrast enhancement algorithm for infrared images based on the multiscale difference of morphological reconstruction. The proposed algorithm operates in three steps. First, a sequential gray morphological reconstruction (SGMR) technique is introduced to effectively remove noise by eliminating bright and dark connected regions in the image. Second, the difference of sequential gray morphological reconstruction (DoSGMR) is designed to extract salient information at various scales, enabling the enhancement of details without amplifying noise. Third, an adaptive fusion strategy is designed to integrate the extracted salient information, enhancing the contrast while simultaneously addressing overexposure and underexposure problems. Experimental results demonstrate that the proposed algorithm outperforms existing methods, achieving superior contrast enhancement, particularly for challenging infrared images corrupted by noise, overexposure, or underexposure.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ video frame interpolation and super resolution reconstruction for accurate monitoring of L-PBF process 现场视频帧插值和超分辨率重建用于精确监测 L-PBF 过程

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111727

Rongzhe Ma, Hui Li, Shengnan Shen, Wenkang Zhu, Jiahong Chen, Minjie Wang, Hua Tu, Yajun Jiang

{"title":"In-situ video frame interpolation and super resolution reconstruction for accurate monitoring of L-PBF process","authors":"Rongzhe Ma, Hui Li, Shengnan Shen, Wenkang Zhu, Jiahong Chen, Minjie Wang, Hua Tu, Yajun Jiang","doi":"10.1016/j.optlastec.2024.111727","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111727","url":null,"abstract":"In the laser powder bed fusion (L-PBF) process, the incorporation of in-situ monitoring systems plays a vital role in guaranteeing the quality of the additive manufacturing (AM) process. Nevertheless, the monitoring system based on high-speed cameras is hindered by the high cost of the required high-speed cameras, making it difficult to achieve accurate in-situ monitoring. This paper studies in-situ video frame interpolation and super resolution reconstruction for accurate monitoring of L-PBF process. It introduces a novel in-situ video frame interpolation algorithm, termed CS-EMA-VFI, aiming to improve the temporal resolution of monitoring video. The visual transformer-based video super resolution (ViTSR) algorithm was employed to enhance the spatial resolution of the interpolated video. A U-Net algorithm was utilized for extracting the geometric characteristics of the molten pool during the L-PBF process subsequent to video frame interpolation and super resolution reconstruction. Comparing the CS-EMA-VFI with seven state-of-the-art video frame interpolation methods, the CS-EMA-VFI achieves the highest peak signal-to-noise ratio (PSNR) of 28.16 dB and the highest structural similarity index measure (SSIM) of 0.917 while being lightweight. The ViTSR achieved PSNR of 28.18 dB and 25.31 dB on the original video sequence and interpolated video sequence, respectively. The inference time for the CS-EMA-VFI with fixed timestep, ViTSR, and U-Net were recorded as 18.5 ms, 48.0 ms, and 20.5 ms, respectively. The total inference time of the three-stage strategy varies from 87.0 ms to 142.5 ms, depending on the temporal resolution enhancement multiples. Additionally, the proposed three-stage method achieves a segmentation accuracy of 90.15 % with fixed timestep interpolation, simultaneously enhancing temporal and spatial resolution, thus enabling accurate and real-time monitoring. This paper promotes the wide adoption of in-situ monitoring system in the AM field.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dispersion characteristics-based asymmetric frequency selective rasorber using spoof surface plasmon polariton mode 利用欺骗性表面等离子体极化子模式的基于色散特性的非对称频率选择性激光雷达

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111718

Yu-Peng Li, Zi-Han Guo, Hai-Feng Zhang

{"title":"Dispersion characteristics-based asymmetric frequency selective rasorber using spoof surface plasmon polariton mode","authors":"Yu-Peng Li, Zi-Han Guo, Hai-Feng Zhang","doi":"10.1016/j.optlastec.2024.111718","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111718","url":null,"abstract":"The present study introduces a comprehensive theoretical design that demonstrates the unique advantages of the Spoof Surface Plasmon Polariton (SSPP) mode in achieving the Absorption-Transmission Window (A-TW) effect, thereby enabling the perfect integration of the SSPP mode with the Frequency Selective Rasorber (FSR). This paper analyzes the main reasons for the coexistence of electromagnetic wave (EMW) transmission and absorption effects, thereby confirming the confining effect of localized fields in the SSPP mode on EMW. Additionally, the distinct dispersion characteristics of the structure are investigated, showcasing the remarkable capability of dispersion engineering in generating customized absorption bands. The results indicate that the aforementioned FSR exhibits absorption abilities of over 90 % for positively incident EMWs in the frequency ranges of 1.44 ∼ 2.04 THz and 4.65 ∼ 5.44 THz, while also making constructive contributions to the formation of the transmission window (TW) in 2.61 ∼ 4.07 THz. Exploring the asymmetric response of EMWs reveals that the FSR exhibits a pseudo-Reflection-Transmission Window (R-TW) effect when excited by reverse-propagating EMWs. This paper proposes an FSR based on the SSPP mode, exhibiting asymmetric EMW response, and hopefully contributes a new perspective for the application and theoretical analysis of the SSPP mode.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"285 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 ultrasonic-assisted laser metal deposition on microcracks in deposition layer 超声波辅助激光金属沉积对沉积层微裂纹的影响

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111747

Huachen Li, Li Cui, Dingyong He, Zhenfu Shi, Fanhui Bu, Qing Cao, Shengjun Wan

{"title":"Effect of ultrasonic-assisted laser metal deposition on microcracks in deposition layer","authors":"Huachen Li, Li Cui, Dingyong He, Zhenfu Shi, Fanhui Bu, Qing Cao, Shengjun Wan","doi":"10.1016/j.optlastec.2024.111747","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111747","url":null,"abstract":"In order to study the effect of non-contact ultrasonic-assisted laser metal deposition (LMD) on microcracks, Fe-based powders were deposited on a 42CrMoA steel using LMD process at different excitation distances (). The results show that the maximum length of microcracks is 112.3 μm under the condition without ultrasonic-assisted. When = 50 mm, a crack of less than 10 μm is generated at the bottom of deposition layer. When = 110 mm, the microcrack maximum length is 84.4 μm. The deposition layer with no microcracks was obtained when = 80 mm. Ultrasonic-assisted application can synergically inhibit the generation of cracks from two aspects. On the one hand, it makes the distribution of B element more uniform in the molten pool, and the accumulation of borides at the bottom of the deposition layer easily generates hard and brittle borides such as M(C,B), which is more likely to induce cracks. After non-contact ultrasonic-assisted, the width of boride is 54.2 % lower than that without ultrasonic-assisted, and the boride morphology is slightly different. The borides changed from long rod-shape and mesh-shape to nanoscale short rod-shape and granular-shape. On the other hand, it can make the microscopic stress distribution at the bottom of deposition layer more uniform, which reduces the crack sensitivity. Compared to the condition without ultrasonic-assisted, when is 50 mm, 80 mm and 110 mm, the KAM average value decreased by 44.03 %, 40.36 % and 19.27 %, respectively.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complete optical field reconstruction and determination of linewidth enhancement factor in gain-switched semiconductor lasers using the Gerchberg–Saxton algorithm 利用 Gerchberg-Saxton 算法重建增益开关半导体激光器的完整光场并确定线宽增强因子

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111731

Alejandro Rosado, Ignacio Esquivias

{"title":"Complete optical field reconstruction and determination of linewidth enhancement factor in gain-switched semiconductor lasers using the Gerchberg–Saxton algorithm","authors":"Alejandro Rosado, Ignacio Esquivias","doi":"10.1016/j.optlastec.2024.111731","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111731","url":null,"abstract":"We propose the use of the Gerchberg–Saxton algorithm to retrieve the time-resolved phase of optical pulses generated by gain-switched semiconductor lasers from the temporal and spectral intensities measured with standard instrumentation. We analyze numerically and experimentally the conditions for retrieving the optical phase and the corresponding time-resolved frequency chirp. The numerical analysis examines the performance of the algorithm under different gain switching conditions, with a particular emphasis on the number of points, the resolution of the input data and the choice of the initial phase seed. The results of this numerical analysis show that the algorithm converges effectively over a wide range of conditions, almost independently of the chosen phase seed and the number of points of the input data. We have experimentally retrieved the phase of optical pulses generated by a gain-switched 1550 nm laser diode. The retrieved frequency chirp was used for the experimental determination of the linewidth enhancement factor, resulting in a simple and robust technique for estimating this parameter.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0