Optics and Laser Technology最新文献_第3页

A novel in situ laser cladding technology incorporating an underwater air chamber for the manufacturing of 316 coating

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-15 DOI: 10.1016/j.optlastec.2025.112713

Gaolin Yang , Quanhang Zheng , Zhao Yong , Tanliang Liu , Huan Qi , Jianhua Yao

Marine equipment faces significant maintenance challenges due to the inability to extract components from the marine environment for repair. Over the past decade, laser cladding technology has experienced rapid development as a method for repairing key parts of ships. However, the direct application of underwater laser cladding for in situ repair remains an area requiring further exploration. This study introduces the development of an innovative air chamber laser processing head and, for the first time, presents an in situ laser repair technology called Underwater Directed Energy Deposition with Air Chamber (UDED-AC). The behavior of the underwater air chamber was analyzed using the Young-Laplace equation and the Rayleigh-Plateau instability principle, elucidating its influence on the cladding process. Additionally, a comparative analysis of the morphology and properties of 316 coatings fabricated in air and underwater environments was conducted. The results indicate that using UDED-AC in situ additive manufacturing technology leads to a deeper molten pool in the underwater environment compared to air. Moreover, the increased precipitation of SiO₂ particles within the dendrites enhances the hardness of the cladding layer prepared underwater. Meanwhile, the corrosion resistance and wear resistance of the deposited layers show no significant differences between underwater and air-prepared samples. The UDED-AC technology uniquely integrates the flexibility of underwater wet cladding with the precision of local drainage cladding, offering a transformative approach for underwater in-situ repair. This innovation holds significant promise for the repair and maintenance of marine equipment in challenging environments.

{"title":"A novel in situ laser cladding technology incorporating an underwater air chamber for the manufacturing of 316 coating","authors":"Gaolin Yang , Quanhang Zheng , Zhao Yong , Tanliang Liu , Huan Qi , Jianhua Yao","doi":"10.1016/j.optlastec.2025.112713","DOIUrl":"10.1016/j.optlastec.2025.112713","url":null,"abstract":"<div><div>Marine equipment faces significant maintenance challenges due to the inability to extract components from the marine environment for repair. Over the past decade, laser cladding technology has experienced rapid development as a method for repairing key parts of ships. However, the direct application of underwater laser cladding for in situ repair remains an area requiring further exploration. This study introduces the development of an innovative air chamber laser processing head and, for the first time, presents an in situ laser repair technology called Underwater Directed Energy Deposition with Air Chamber (UDED-AC). The behavior of the underwater air chamber was analyzed using the Young-Laplace equation and the Rayleigh-Plateau instability principle, elucidating its influence on the cladding process. Additionally, a comparative analysis of the morphology and properties of 316 coatings fabricated in air and underwater environments was conducted. The results indicate that using UDED-AC in situ additive manufacturing technology leads to a deeper molten pool in the underwater environment compared to air. Moreover, the increased precipitation of SiO<sub>2</sub> particles within the dendrites enhances the hardness of the cladding layer prepared underwater. Meanwhile, the corrosion resistance and wear resistance of the deposited layers show no significant differences between underwater and air-prepared samples. The UDED-AC technology uniquely integrates the flexibility of underwater wet cladding with the precision of local drainage cladding, offering a transformative approach for underwater in-situ repair. This innovation holds significant promise for the repair and maintenance of marine equipment in challenging environments.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112713"},"PeriodicalIF":4.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628812","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

Lossy mode resonance optical sensors on-chip and on-fiber

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-15 DOI: 10.1016/j.optlastec.2025.112731

Nuerguli Kari , Wanming Zhao , Ben Li , Xiangyu Yin , Lei Wang , Aisong Zhu , Qi Wang

Lossy Mode Resonance Optical Sensors (LMROS) have attracted significant research interest due to their superior in material selection and sensing performance compared to Surface Plasmon Resonance (SPR) senors. This review provides the large map of LMROS configuration, focusing on the supporting platform on prism, optical fiber, and on chip. The discussion includes a concise introduction to the basic principles, and the configuration types following with various coupling techniques, concerning depositing techniques, tapering techniques in different circumstance. Firstly the prismatic configuration mainly in Kretschmann configuration is discussed with two layer structure and three layer structure on the prism surface. Then fiber based configuration is discussed from the cladding removed fiber, tapered fiber and cladding etched fiber, side polished fiber, fiber with grating structures, fiber tip structures, to novel fibers such as photonic crystal fiber, coreless fiber, and double cladding fiber configuration. And then the on-chip configurations are discussed with the chip as the center, which is coupled through fibers on its end-face and lateral-face, or though other coupling technique on the integrated optical waveguide, or photonic integrated circuits. Some inconsistent concepts are discussed, and critically some of conventional optical waveguide structures are discussed from the point of Lossy Mode Resonance (LMR) phenomenon, considering the applied materials, and sensing performance. Finally, the advantages and possible future trend of each configuration are discussed.

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引用次数: 0

Study on characteristics of noise-like pulses and dissipative soliton resonance pulses in nonlinear multimode interference mode-locked fiber lasers

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-15 DOI: 10.1016/j.optlastec.2025.112799

Meng Li , Ling Qin , Xingwei Li , Jiaxin Zhang , Yubin Zhang , Jianshe Li , Shuguang Li , Geng Li

Nonlinear multimode interference mode-locking technology is a passive mode-locking technology utilized to generate ultrashort pulse lasers. This paper employs two sets of single mode fiber-graded-index multimode fiber-single mode fiber (SMF-GIMF-SMF) structures to create an SMF-GIMF-SMF-GIMF-SMF saturable absorber, which facilitates mode-locking; results in three distinct of pulse outputs: noise-like pulses, dissipative soliton resonance pulses, and dual-wavelength pulses. One of the SMF-GIMF-SMF structures is fixed, while the other is adjustable. The adjustable segment comprises two sections of SMF and one section of GIMF wound within a polarization controller (PC) at its center. By manipulating the PC, the mode-locking state can be modified. This paper explores the transition of soliton bunch pulses into noise-like pulses and successfully generates dissipative soliton resonance pulses in the anomalous dispersion region. Additionally, the filtering capability of the saturable absorber structure is leveraged to achieve dual-wavelength pulse output. The findings demonstrates that the mode-locking structure SMF-GIMF-SMF-GIMF-SMF formed by the series connection of two SMF-GIMF-SMF sets not only exhibits excellent saturable absorption characteristics conducive to ultrashort laser pulse mode-locking but can also be utilized for filtering to accomplish dual-wavelength output. Furthermore, through the adjustment of the PC and pump power during experiments, intricate nonlinear effects were induced, leading to a diverse range of mode-locking phenomena. This paper serves as a reference for theoretical research, performance enhancement, and practical applications of ultrafast fiber lasers.

{"title":"Study on characteristics of noise-like pulses and dissipative soliton resonance pulses in nonlinear multimode interference mode-locked fiber lasers","authors":"Meng Li , Ling Qin , Xingwei Li , Jiaxin Zhang , Yubin Zhang , Jianshe Li , Shuguang Li , Geng Li","doi":"10.1016/j.optlastec.2025.112799","DOIUrl":"10.1016/j.optlastec.2025.112799","url":null,"abstract":"<div><div>Nonlinear multimode interference mode-locking technology is a passive mode-locking technology utilized to generate ultrashort pulse lasers. This paper employs two sets of single mode fiber-graded-index multimode fiber-single mode fiber (SMF-GIMF-SMF) structures to create an SMF-GIMF-SMF-GIMF-SMF saturable absorber, which facilitates mode-locking; results in three distinct of pulse outputs: noise-like pulses, dissipative soliton resonance pulses, and dual-wavelength pulses. One of the SMF-GIMF-SMF structures is fixed, while the other is adjustable. The adjustable segment comprises two sections of SMF and one section of GIMF wound within a polarization controller (PC) at its center. By manipulating the PC, the mode-locking state can be modified. This paper explores the transition of soliton bunch pulses into noise-like pulses and successfully generates dissipative soliton resonance pulses in the anomalous dispersion region. Additionally, the filtering capability of the saturable absorber structure is leveraged to achieve dual-wavelength pulse output. The findings demonstrates that the mode-locking structure SMF-GIMF-SMF-GIMF-SMF formed by the series connection of two SMF-GIMF-SMF sets not only exhibits excellent saturable absorption characteristics conducive to ultrashort laser pulse mode-locking but can also be utilized for filtering to accomplish dual-wavelength output. Furthermore, through the adjustment of the PC and pump power during experiments, intricate nonlinear effects were induced, leading to a diverse range of mode-locking phenomena. This paper serves as a reference for theoretical research, performance enhancement, and practical applications of ultrafast fiber lasers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112799"},"PeriodicalIF":4.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632191","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

Accelerating image reconstruction of asynchronous optofluidic time-stretch imaging flow cytometry

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112753

Jiehua Zhou , Zhuo Yin , Yan Ding , Xun Liu , Kaining Yang , Xiao Ma , Xiaoyang Chen , Yaxiaer Yalikun , Du Wang , Cheng Lei

Imaging flow cytometry is a powerful tool for profiling cell samples based on cell morphology. Optofluidic time-stretch imaging flow cytometry enhances this process with high-throughput and high-precision cell analysis capabilities, essential for fields such as cell biology and clinical medicine. The processing platform integrated with ADC and FPGA is crucial for achieving real-time acquisition and analysis of the cell image data. Synchronous sampling simplifies the image reconstruction process and provides good image quality but increases overall system complexity. Conversely, asynchronous sampling can significantly simplify the system structure and enhance flexibility, but it requires a complex algorithm to compensate for deviations between the sampling clock and the pulse repetition frequency, affecting the real-time data processing performance. In this study, we propose a calibration algorithm to accurately reconstruct the optical time-stretch imaging (OTS) image of asynchronous OTS systems. By implementing a portion of the proposed algorithm on the FPGA during the front-end data acquisition process, we achieve up to 26.82 times acceleration in image reconstruction. Furthermore, we leverage thread acceleration to enable asynchronous OTS systems to achieve a frame rate of up to 1066.11 frames per second (FPS), representing the highest reported rate for image reconstruction in asynchronous OTS imaging. This research provides valuable insights into optimizing OTS imaging systems for real-time applications, facilitating the commercialization of optofluidic time-stretch imaging flow cytometry and widespread adoption in clinical applications.

{"title":"Accelerating image reconstruction of asynchronous optofluidic time-stretch imaging flow cytometry","authors":"Jiehua Zhou , Zhuo Yin , Yan Ding , Xun Liu , Kaining Yang , Xiao Ma , Xiaoyang Chen , Yaxiaer Yalikun , Du Wang , Cheng Lei","doi":"10.1016/j.optlastec.2025.112753","DOIUrl":"10.1016/j.optlastec.2025.112753","url":null,"abstract":"<div><div>Imaging flow cytometry is a powerful tool for profiling cell samples based on cell morphology. Optofluidic time-stretch imaging flow cytometry enhances this process with high-throughput and high-precision cell analysis capabilities, essential for fields such as cell biology and clinical medicine. The processing platform integrated with ADC and FPGA is crucial for achieving real-time acquisition and analysis of the cell image data. Synchronous sampling simplifies the image reconstruction process and provides good image quality but increases overall system complexity. Conversely, asynchronous sampling can significantly simplify the system structure and enhance flexibility, but it requires a complex algorithm to compensate for deviations between the sampling clock and the pulse repetition frequency, affecting the real-time data processing performance. In this study, we propose a calibration algorithm to accurately reconstruct the optical time-stretch imaging (OTS) image of asynchronous OTS systems. By implementing a portion of the proposed algorithm on the FPGA during the front-end data acquisition process, we achieve up to 26.82 times acceleration in image reconstruction. Furthermore, we leverage thread acceleration to enable asynchronous OTS systems to achieve a frame rate of up to 1066.11 frames per second (FPS), representing the highest reported rate for image reconstruction in asynchronous OTS imaging. This research provides valuable insights into optimizing OTS imaging systems for real-time applications, facilitating the commercialization of optofluidic time-stretch imaging flow cytometry and widespread adoption in clinical applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112753"},"PeriodicalIF":4.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628811","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

Resolution enhancement of light field displays using a polarization-dependent virtual-moving liquid crystalline polymer-lenticular lens array with rapid switching operation

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112794

Tae-Hyun Lee , Min-Kyu Park , Munkh-Uchral Erdenebat , Jin-Hyeok Seo , Jae-Won Lee , Kyung-Il Joo , Yang-Su Kim , Gwangsoon Lee , Hyeontaek Lee , Hee-Jin Choi , Hak-Rin Kim

We propose an effective method to enhance resolution in light field (LF) three-dimensional (3D) displays using a virtual-moving liquid crystalline polymer-lenticular lens array (LCP-LLA) combined with a time-sequential polarization control scheme and rapid lateral switching of periodic focusing operations. The virtual-moving LCP-LLA is custom-fabricated by stacking two LCP-LLAs with a half sub-pixel pitch offset, enabling a time-sequential virtual lateral shift of the focal plane. Additionally, we enhance the angular resolution of reconstructed 3D images by optimizing the lateral shifting configurations of the stacked LCP-LLAs in alignment with the sub-pixel arrangement of the display panel. These approaches notably minimize spatial resolution loss while improving angular resolution with a fixed panel configuration, based on the optical properties of the custom-designed virtual-moving LCP-LLA. Experimental validation demonstrates the efficacy of this method, achieving two-fold enhancement in angular resolution for 3D images with 20 viewpoints, without compromising spatial resolution.

{"title":"Resolution enhancement of light field displays using a polarization-dependent virtual-moving liquid crystalline polymer-lenticular lens array with rapid switching operation","authors":"Tae-Hyun Lee , Min-Kyu Park , Munkh-Uchral Erdenebat , Jin-Hyeok Seo , Jae-Won Lee , Kyung-Il Joo , Yang-Su Kim , Gwangsoon Lee , Hyeontaek Lee , Hee-Jin Choi , Hak-Rin Kim","doi":"10.1016/j.optlastec.2025.112794","DOIUrl":"10.1016/j.optlastec.2025.112794","url":null,"abstract":"<div><div>We propose an effective method to enhance resolution in light field (LF) three-dimensional (3D) displays using a virtual-moving liquid crystalline polymer-lenticular lens array (LCP-LLA) combined with a time-sequential polarization control scheme and rapid lateral switching of periodic focusing operations. The virtual-moving LCP-LLA is custom-fabricated by stacking two LCP-LLAs with a half sub-pixel pitch offset, enabling a time-sequential virtual lateral shift of the focal plane. Additionally, we enhance the angular resolution of reconstructed 3D images by optimizing the lateral shifting configurations of the stacked LCP-LLAs in alignment with the sub-pixel arrangement of the display panel. These approaches notably minimize spatial resolution loss while improving angular resolution with a fixed panel configuration, based on the optical properties of the custom-designed virtual-moving LCP-LLA. Experimental validation demonstrates the efficacy of this method, achieving two-fold enhancement in angular resolution for 3D images with 20 viewpoints, without compromising spatial resolution.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112794"},"PeriodicalIF":4.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recognition and phenotypic detection of maize stem and leaf at seedling stage based on 3D reconstruction technique

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112787

Haiou Guan, Xueyan Zhang, Xiaodan Ma, Zuyu Zhuo, Haotian Deng

As one of the major global food crops, rapid detection of seedling maize phenotypic traits is important for maize cultivation, management and variety selection. Due to the lack of a systematic approach for the morphological-physiological phenotypic profiling of maize growth stages, it is urgent to overcome the challenges of multi-view 3D reconstruction and phenotypic detection in seedling maize. In this paper, recognition and phenotypic detection of maize stem and leaf at seedling stage was proposed based on 3D reconstruction technology. First, a maize heterogeneous data collection system was constructed using three Kinect v2 sensors to acquire 810 sets of color images and depth data for the maize plant. Second, maize plant data were obtained through filtering, radius outlier removal, and Euclidean distance segmentation algorithms. Third, an improved random sample consensus − trimmed iterative closest point (RANSAC-TrICP) algorithm was employed for 3D registration of multi-view maize point clouds, achieving an average registration error of 0.0030. On this basis, a maize stem and leaf recognition method was established, which integrated eigenvalue decomposition and normal analysis techniques, achieving an accuracy of 0.9897. In addition, the density-based spatial clustering of applications with noise (DBSCAN) clustering algorithm was used to identify individual leaves, with an accuracy of 0.9516. Finally, 3D image processing and mathematical statistical algorithms were used to establish the plant height algorithm based on3D Euclidean distance, the leaf length algorithm based on fitting the single-leaf axis, the canopy width algorithm based on the external rectangle, and the stem thickness algorithm based on the least-squares method of fitting a circle. The results showed that the R² values for plant height, canopy width, leaf length, and stem thickness, were 0.9723, 0.9788, 0.9796, and 0.9876, respectively, comparing the calculated values with the measured values. This method effectively addressed the challenges of high-throughput phenotypic detection technology in monitoring maize growth state, providing a quantitative basis for the scientific regulation of phenotypic traits in maize cultivation, management, and breeding.

{"title":"Recognition and phenotypic detection of maize stem and leaf at seedling stage based on 3D reconstruction technique","authors":"Haiou Guan, Xueyan Zhang, Xiaodan Ma, Zuyu Zhuo, Haotian Deng","doi":"10.1016/j.optlastec.2025.112787","DOIUrl":"10.1016/j.optlastec.2025.112787","url":null,"abstract":"<div><div>As one of the major global food crops, rapid detection of seedling maize phenotypic traits is important for maize cultivation, management and variety selection. Due to the lack of a systematic approach for the morphological-physiological phenotypic profiling of maize growth stages, it is urgent to overcome the challenges of multi-view 3D reconstruction and phenotypic detection in seedling maize. In this paper, recognition and phenotypic detection of maize stem and leaf at seedling stage was proposed based on 3D reconstruction technology. First, a maize heterogeneous data collection system was constructed using three Kinect v2 sensors to acquire 810 sets of color images and depth data for the maize plant. Second, maize plant data were obtained through filtering, radius outlier removal, and Euclidean distance segmentation algorithms. Third, an improved random sample consensus − trimmed iterative closest point (RANSAC-TrICP) algorithm was employed for 3D registration of multi-view maize point clouds, achieving an average registration error of 0.0030. On this basis, a maize stem and leaf recognition method was established, which integrated eigenvalue decomposition and normal analysis techniques, achieving an accuracy of 0.9897. In addition, the density-based spatial clustering of applications with noise (DBSCAN) clustering algorithm was used to identify individual leaves, with an accuracy of 0.9516. Finally, 3D image processing and mathematical statistical algorithms were used to establish the plant height algorithm based on3D Euclidean distance, the leaf length algorithm based on fitting the single-leaf axis, the canopy width algorithm based on the external rectangle, and the stem thickness algorithm based on the least-squares method of fitting a circle. The results showed that the R<sup>2</sup> values for plant height, canopy width, leaf length, and stem thickness, were 0.9723, 0.9788, 0.9796, and 0.9876, respectively, comparing the calculated values with the measured values. This method effectively addressed the challenges of high-throughput phenotypic detection technology in monitoring maize growth state, providing a quantitative basis for the scientific regulation of phenotypic traits in maize cultivation, management, and breeding.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112787"},"PeriodicalIF":4.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620814","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

Optical Möbius transformation module for expanding beam-steering dimensions

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112784

Dong Yang, Qiang He, Zituo Wu, Lixun Wu, Siyuan Yu, Yanfeng Zhang

Beam-steering dimension expansion can map a one-dimensional (1D) array with N² points to a 2D array with N

\times

N points. The scanning mode of existing expansion systems is limited to raster scan, therefore a new beam-steering dimension expansion module with advanced scanning mode is high desirable for easy integration with light detection and ranging (LiDAR) system. We propose an optical Möbius transformation (OMT) module that can enable any single 1D scanning to 2D scanning. We experimentally demonstrate the transformation of a 1D static strip into 2D linear and radial fields utilizing specified OMT phase plates. We further realize the dynamic process of converting 1D steering spots into 2D steering array. The OMT module can achieve 2D beam-steering over a 15° field of view with an angular resolution of 0.5° combined with a Fourier transform lens. A LiDAR system that is capable of 3D imaging (with a resolution of 30 × 30 pixels) have been implemented by combing our OMT module with a simple Time-of-Flight (TOF) sensor. This scheme provides a simple and cost-effective solution to generate 2D static and dynamic structured light fields from a 1D strip or scanning spots, which can facilitate applications such as LiDAR, laser processing, 2D display and illumination.

{"title":"Optical Möbius transformation module for expanding beam-steering dimensions","authors":"Dong Yang, Qiang He, Zituo Wu, Lixun Wu, Siyuan Yu, Yanfeng Zhang","doi":"10.1016/j.optlastec.2025.112784","DOIUrl":"10.1016/j.optlastec.2025.112784","url":null,"abstract":"<div><div>Beam-steering dimension expansion can map a one-dimensional (1D) array with N<sup>2</sup> points to a 2D array with N <span><math><mo>×</mo></math></span> N points. The scanning mode of existing expansion systems is limited to raster scan, therefore a new beam-steering dimension expansion module with advanced scanning mode is high desirable for easy integration with light detection and ranging (LiDAR) system. We propose an optical Möbius transformation (OMT) module that can enable any single 1D scanning to 2D scanning. We experimentally demonstrate the transformation of a 1D static strip into 2D linear and radial fields utilizing specified OMT phase plates. We further realize the dynamic process of converting 1D steering spots into 2D steering array. The OMT module can achieve 2D beam-steering over a 15° field of view with an angular resolution of 0.5° combined with a Fourier transform lens. A LiDAR system that is capable of 3D imaging (with a resolution of 30 × 30 pixels) have been implemented by combing our OMT module with a simple Time-of-Flight (TOF) sensor. This scheme provides a simple and cost-effective solution to generate 2D static and dynamic structured light fields from a 1D strip or scanning spots, which can facilitate applications such as LiDAR, laser processing, 2D display and illumination.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112784"},"PeriodicalIF":4.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620818","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

Thermodynamic modeling and mechanistic study of large-aperture ADP crystal components under thermal-fluid-structural multiphysics coupling 热流体-结构多物理场耦合条件下大孔径 ADP 晶体元件的热力学建模和机理研究

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112797

Fuzhong Sun , Pengyu Li , Dianfu Sun , Guoyu Fu , Kai Yang , Chendong Zhao

Large-aperture ADP crystals play a crucial role in high-power laser systems such as inertial confinement fusion (ICF). This study primarily investigates the thermodynamic issues caused by thermal-fluid–solid coupling during the thermal structural design of crystal components. To address this, an analysis model of thermal-fluid–solid coupling for large-aperture ADP crystal components was developed, tailored to the working characteristics of crystal components in ICF devices. The heat transfer characteristics were studied through numerical simulations and experimental verification, revealing the relationship between crystal surface deformation and various physical fields. The results indicate that vortices in the flow field within the heating cavity cause variations in the temperature field, with relatively minor temperature gradients in the core region. These temperature gradients are crucial in forming internal thermal stress within the crystal. This thermal stress, combined with clamping forces, leads to deformation of the crystal surface, thereby affecting its optical performance. Variance analysis indicates that the effects of clamping stress, temperature gradient, and posture conditions on the PV value decrease sequentially, with contribution rates of 54.0 %, 20.0 %, and 26.0 %, respectively. The findings of this study are significant for refining the thermal structural design theory of large-aperture crystal components and advancing the development in ICF devices.

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引用次数: 0

High robustness of NV sensors in diamond using hybrid heterodyne technique for audio recognition

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112780

Yang Li , Chenyu Hou , Qi Jia , Doudou Zheng , Jian Gao , Yingjie Yang , Huanfei Wen , Xin Li , Hao Guo , Zhonghao Li , Yasuhiro Sugawara , Yanjun Li , Jun Tang , Zongmin Ma , Jun Liu

Importance of using nitrogen-vacancy (NV) center as quantum sensors in diamonds is of great significance in their high sensitivity and stability, which are widely applied in microwave detection area. Especially, the heterodyne technique can beyond the limitation of quantum coherence time and stands out with the advantage of high frequency resolution. However, the realization of high frequency resolution relies on long-time measurements, so how to reduce the noise and maintain the stability of the system during the long-time measurements has become an urgent problem. Here, we propose a novel method for NV sensors that combines common-mode rejection (CMR) and proportional and integral (PI) control techniques with the heterodyne technique. This method achieves a 5 dB increase in signal-to-noise ratio (SNR) and measurement stability over long periods of time with 2.4 times improvement in the minimum Allan variance averaging time. Where, the CMR and PI technologies achieve high SNR and longtime stability by matching the differential inputs to reduce the common mode noise and by decreasing steady-state error through an integral controller, respectively. A frequency resolution of 9.5 mHz and the minimum detectable magnetic field of 4.85pT over an average time of ≈2400 s have been achieved by using the hybrid heterodyne technique. Finally, we demonstrate the capability of audio recognition with this hybrid heterodyne technique, as well as having potential application in fields such as magnetic resonance imaging (MRI) and unknown signal exploration.

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引用次数: 0

In-situ X-ray imaging reveals the effect of spatter on single melt track at high layer thickness during laser powder bed melting

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-14 DOI: 10.1016/j.optlastec.2025.112717

Shicheng Liu , Zhanpeng Sun , Ziao Yan , Nan Su , Kangshuo Li , Guanglei Shi , Bin Wei , Guang Yang

Through in-situ micro-focus X-ray imaging technology, the formation processes of melt tracks for 316L were investigated at high layer thicknesses. Some lager size (d > 150 μm) were observed, named ’agglomeration spatter’, which originated at the front of the melt pool. More interestingly, the agglomeration spatter is not always harmful under the experimental conditions of this study, some spatter incorporate into the melt pool can be advantageous for forming the continuous melt track due to their supplement for liquid mass. This also proves a newly identified role of the spatter on the melt track formation. Moreover, direct correlations between the spatter (>50 μm) and defects of the melt track were established. If one large solidified spatter falls and coalesces with another on the melt track surface, it can form balling or protrusion. Sometimes, large spatter clusters fail to incorporate into the melt pool in time, thereby compromising the height consistency of the melt track. The violent surface fluctuations of the melt pool induced by the incorporates of agglomeration spatter results in fish-scale bumps on surface of the melt track. The drop point deviation of the agglomeration spatter even causes discontinuity of the melt track. We also found that the agglomeration spatter can serve as a monitoring indicator after statistical analysis, and the agglomeration spatter with an ejection velocity higher than 0.08 m/s will cause defects. This study provides deep insight into the role of spatter on melt track formation in LPBF.

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引用次数: 0