Optics & Laser Technology最新文献_第2页

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

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

Feature enhanced non-line-of-sight imaging using graph model in latent space 利用潜空间图模型增强非视线成像特征

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111538

Weihao Xu, Songmao Chen, Dingjie Wang, Yuyuan Tian, Ning Zhang, Wei Hao, Xiuqin Su

引用次数: 0

Characterization of low-power pulsed laser-induced single/double arc hybrid heat source bottoming welding of medium-thick plate titanium alloy 低功率脉冲激光诱导单/双弧混合热源打底焊接中厚板钛合金的特性分析

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111623

Huanyu Yang, Zhigang Cheng, Xingkong Tao, Liming Liu

{"title":"Characterization of low-power pulsed laser-induced single/double arc hybrid heat source bottoming welding of medium-thick plate titanium alloy","authors":"Huanyu Yang, Zhigang Cheng, Xingkong Tao, Liming Liu","doi":"10.1016/j.optlastec.2024.111623","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111623","url":null,"abstract":"In order to study the heat source characteristics and discharge mechanism of low power pulse laser induced arc/double arc hybrid welding technology in the narrow gap backing welding process of titanium alloy medium-thick plate, laser-TIG (L-TIG) hybrid welding and laser-double TIG (L-DTIG) hybrid welding technology were used in this paper. Welding experiments were carried out under different blunt edge thicknesses. Two kinds of welding methods were used to compare the influence of the temperature field of the weld, the morphology of the coupled plasma and the energy distribution of the plasma, the coupling driving force and the force state of the plasma, and the influence of the microstructure and properties of the weld. The results show that the welding heat input of L-DTIG is significantly lower than that of L-TIG hybrid heat source, and there is a larger process interval in the backing welding of different blunt edge thicknesses. Under the action of pulsed laser, the L-DTIG hybrid heat source plasma has a larger central conductive area and electron density, which are 1.68 times and 1.42 times of the L-TIG hybrid heat source, respectively. Due to the small heat input of L-DTIG hybrid welding, the grain size is significantly reduced, so that the hardness of the weld zone and the heat affected zone is slightly higher than that of the L-TIG hybrid heat source, and the hardness distribution from the weld center to the base metal shows a downward trend. Due to the stronger induction and compression ability of the pulsed laser to the double TIG arc, the energy density of the L-DTIG hybrid heat source is more concentrated, which is beneficial to reduce the welding heat input and improve the welding efficiency and the overall performance of the welded joint.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219920","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

Deep learning enabled design of terahertz high-Q metamaterials 利用深度学习设计太赫兹高 Q 值超材料

Optics & Laser Technology Pub Date : 2024-09-05 DOI: 10.1016/j.optlastec.2024.111684

Shan Yin, Haotian Zhong, Wei Huang, Wentao Zhang

{"title":"Deep learning enabled design of terahertz high-Q metamaterials","authors":"Shan Yin, Haotian Zhong, Wei Huang, Wentao Zhang","doi":"10.1016/j.optlastec.2024.111684","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111684","url":null,"abstract":"Metamaterials open up a new way to manipulate electromagnetic waves and realize various functional devices. Metamaterials with high-quality factor (Q) resonance responses are widely employed in sensing, detection, and other applications. Traditional design of metamaterials involves laborious simulation-optimization and limits the efficiency. The high-Q metamaterials with abrupt spectral change are even harder to reverse design on-demand. In this paper, we propose novel solutions for designing terahertz high-Q metamaterials based on deep learning, including the inverse design of structural parameters and the forward prediction of spectral responses. For the inverse design, we introduce the big data Visual Attention Network (VAN) model with a large model capability, and take additional parameter tuning for the key sensitive parameters and predict them individually, which can efficiently reduce errors and achieve highly accurate inverse design of structural parameters according to the target high-Q resonance responses. For the forward prediction, we develop the Electromagnetic Response Transformer (ERT) model to establish the complex mapping relations between the highly sensitive structural parameters and the abrupt spectra, and realize precise prediction of the high-Q resonance in terahertz spectra from given structural parameters. Our ERT model can be 4000 times faster than the conventional full wave simulations in computation time. Both models exhibit outstanding performance, and the accuracy is improved one or two orders higher compared to the traditional machine learning methods. Our work provides new avenues for the deep learning enabled design of terahertz high-Q metamaterials, which holds potential applications in various fields, such as terahertz communication, sensing, imaging, and functional devices.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219923","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

Single-shot 3D measurement via deep learning fringe projection profilometry with geometric constraints 通过带几何约束的深度学习条纹投影轮廓仪进行单次三维测量

Optics & Laser Technology Pub Date : 2024-09-04 DOI: 10.1016/j.optlastec.2024.111735

Ze Li, Jianhua Wang, Suzhen Wang, Wen Zhang, Shuo Shan, Yanxi Yang

{"title":"Single-shot 3D measurement via deep learning fringe projection profilometry with geometric constraints","authors":"Ze Li, Jianhua Wang, Suzhen Wang, Wen Zhang, Shuo Shan, Yanxi Yang","doi":"10.1016/j.optlastec.2024.111735","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111735","url":null,"abstract":"Single-shot three-dimensional (3D) measurement has always been the ultimate goal of fringe projection profilometry (FPP). Some studies have shown that deep learning outperforms traditional algorithm in analyzing single fringe pattern for complex scenarios. However, accurately phase unwrapping for a single wrapped phase map remains a significant challenge. In this paper, we propose a deep learning-based fringe projection profilometry. This method considers the geometric constraints of the measurement system. With the reference phase generated by the calibration parameters and appropriately designed intermediate variables based on physical models and prior knowledge, the proposed method is capable of recovering high-quality absolute phase from a single fringe pattern at the accuracy sufficiently high to rival traditional multi-frame algorithms. In addition, as far as FPP is concerned, the significance of the reference phase generated by the calibration parameters of the measurement system for deep learning-based single-frame phase unwrapping is experimentally demonstrated. Experiments on both static and dynamic scenarios show that the proposed method can achieves motion-artifact-free and high-resolution single-shot 3D measurements in various complex scenarios using only a single-frequency fringe projection.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219921","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

Efficient watt-level fluoride fiber laser beyond 3 μm enabled by direct diode pumping 通过直接二极管泵浦实现 3 μm 以上的高效瓦级氟化物光纤激光器

Optics & Laser Technology Pub Date : 2024-09-04 DOI: 10.1016/j.optlastec.2024.111715

Xiangyu Zhao, Hongyu Luo

{"title":"Efficient watt-level fluoride fiber laser beyond 3 μm enabled by direct diode pumping","authors":"Xiangyu Zhao, Hongyu Luo","doi":"10.1016/j.optlastec.2024.111715","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111715","url":null,"abstract":"Rare-earth-ion-doped fluoride fiber laser enabled by direct diode pumping provides a compact and robust platform for mid-infrared production, thereby serving a number of real-world applications. Nowadays, the power of such an architecture beyond 3 μm, however, has been clamped at < 1 W due to lack of readily available laser diode and/or efficient operation mechanism. In this work, we experimentally present efficient watt-level power output beyond 3 μm from an Er/Dy codoped fluoride fiber laser, clad-pumped by a cost-effective 974 nm diode, for the first time. In a free-running F-P scheme with an optimized output coupler reflectivity of 33 %, a maximum output power of 3.03 W at ∼3210 nm has been achieved with a slope efficiency of up to 19.1 % (with respect to the coupled pump), representing the first > 1 W diode-pumped rare-earth-ion-doped fiber laser beyond 3 µm with the highest efficiency. Then the numerical model, validated by our experimental data, has been built up, in which the previously ignored processes (i.e., ∼2.8 µm emission of Er and absorption of Dy) have been considered as an equivalent cross relaxation process, and confirmed probably to be the dominant role in determining efficient operation of this system. Using the model, the numerical optimization and performance prediction have been performed. Numerical comparison with the state-of-the-art Dy-doped fluoride fiber laser in this band based on tandem pumping approach indicates great potential of Er/Dy codoped system in high-power operation and its merits of compactness and high cost effectiveness as a promising alternative scheme.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219922","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