Article
Materials Science, Multidisciplinary
Jian Liu, Yali He, Min Xia, Yaowu Hu
Summary: This study investigated the rate dependence of the forming behaviors of Al and Au nanofilms using laser-induced ultrahigh strain rate forming processes. The results showed that the nanofilms exhibited superplastic behavior above a critical value of the strain rate, and the superplastic forming mechanism mediated by interstitials was revealed for the first time. This discovery is of great significance for understanding the deformation mechanism and constitutive relationship of nanometals.
MATERIALS & DESIGN
(2022)
Article
Engineering, Mechanical
Jianfeng Zhao, Xinlei Pan, Jian Li, Zhiyong Huang, Qianhua Kan, Guozheng Kang, Liucheng Zhou, Xu Zhang
Summary: Systematic characterization of microstructure, mechanical testing and constitutive modeling were conducted to investigate the effects of laser shock peening (LSP) treatment on the tensile properties of Ti-6Al-4 V alloy. The study revealed that LSP treatment resulted in grain refinement and introduction of compressive residual stress, leading to changes in the material's elastic-plastic behavior. The established deformation mechanism-based model showed that surface grain refinement enhanced initial yielding and strain hardening, while residual stress had a weakening effect on initial yielding but little influence on strain hardening behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Coatings & Films
Quan Liu, Xiaofeng Hu, Chenyu Su, Chen Zhang
Summary: This study investigates laser shock imprinting for manufacturing functional thin films. It is found that micro molds with different patterns fabricated using femtosecond pulsed lasers can tailor the optical function performance of the films. The influence of mold material on wear resistance and the difference in performance caused by different molds are also analyzed using elastoplastic mechanics of finite element method.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Xun Chen, Yufeng Huang, Lei Zhang, Hua Shu, Baishan Chen, Yunzhu Ma, Wensheng Liu
Summary: In this study, laser-induced shock technology was used to investigate the shock loading behavior of polycrystalline tungsten at an ultrahigh strain rate. It was found that the fracture behavior of tungsten changed from an intergranular mode under quasistatic conditions to a transgranular-intergranular mixed mode at high strain rates, with an increased proportion of transgranular cleavage. The spall strength of tungsten was positively correlated with the strain rate, reaching 5.86 GPa at a tensile strain rate of 106 s-1. The increased mobility of screw dislocations at high strain rates improved the spall strength and accelerated the expansion of crack nucleation positions, resulting in numerous transgranular fractures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Chemistry, Physical
Haifeng Yang, Jingbin Hao, Haoda Wang, Mengsen Ding
Summary: In this study, a new metal micro-mold manufacturing method using laser shock imprinting (LSI) on the surface of metal foil is proposed. The strength of the mold increased after laser shocking, and a copper foil with a flat back was selected as the final metal micro-mold based on analysis and numerical simulation. The metal micro-mold produced via LSI showed high accuracy and molding stability, with potential applications in roll-to-roll hot embossing.
Article
Nanoscience & Nanotechnology
Abhijit Sadhu, Sagar Sarkar, Angshuman Chattopadhyay, Omkar Mypati, Surjya K. Pal, Ashish Kumar Nath
Summary: The study showed that LSP treatment can enhance yield strength and fatigue life of base and FSW specimens, but has less obvious effect on surface residual stress. Additionally, the increase in low angle grain boundaries after LSP indicates an increase in substructure induced by plastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
Keyang Wang, Huixia Liu, Youjuan Ma, Jinzhong Lu, Xiao Wang, Jiaxin Lu, Xin Gu, Haokun Zhang
Summary: This study applies high rate forming technology to the manufacture of miniature parts and proposed a novel miniature parts bulk forming method, LSMBF. Through numerical simulation and experimental research, the feasibility of using LSMBF method to manufacture miniature parts is discussed. The SPH-FE method is found to be more consistent with experiments and suitable for simulating complex large deformation forming process of LSMBF compared to the CEL method.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Industrial
Qifan Gong, Xiao Wang, Di Zhang, Xin Hou, Tao Zhang, Huixia Liu
Summary: This paper proposes a new method called laser shock micro-coining (LSMC) for the fabrication of functional and decorative microstructures. Numerical simulation and experiments are conducted to study the forming mechanism and improvement methods of flow-through, and appropriate research parameters are determined. The results show that suitable laser energy and large sheet thickness as well as the existence of the punch can inhibit the formation of flow-through and achieve good forming uniformity.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Junying Min, Jincheng Wang, Junhe Lian, Yi Liu, Zeran Hou
Summary: Laser-assisted robotic roller forming (LRRF) was used to bend ultrahigh-strength steel sheet, and the effects of laser power density on bending forces, springback, and bending radius were investigated. The results showed that LRRF reduced bending forces by 43% and achieved high precision with a springback angle smaller than 1 degree and a radius-to-thickness ratio of around 1.2 at a laser power density of 10 J/mm². The reduction in forming forces can be attributed to higher temperatures, which decrease the material's strength, and the heating-to-austenitization temperature and subsequent forming at a temperature above the martensitic-transformation temperature.
Article
Optics
Lala Zhao, Yisai Wang, Yanqing Wang, Yan Wang, Haifeng Yang
Summary: This study investigated the mechanism and process of dislocation strengthening induced by laser shock processing and optimized the target parameters for potential high-temperature and high-pressure applications of the prepared microstructures.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jian Liu, Yali He, Yaowu Hu
Summary: A strategy for the large-scale fabrication of ultra-sharp nanostructures is proposed by reshaping hardened structures, taking advantage of the special hardening behavior of nanometals at ultra-high strain rates. This strategy allows for the formation of nanostructures with sub-10 nm resolution and demonstrates excellent surface Raman enhancement for high-sensitivity molecular detection.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Automation & Control Systems
Qifan Gong, Xiao Wang, Tao Zhang, Xin Hou, Zongbao Shen, Huixia Liu
Summary: This study investigated a warm laser shock micro-heading forming method, studying the deformation process of materials and analyzing the effects of laser energy, temperature, and grain size on forming. Experimental results showed that changes in forming temperature and grain size can affect the discreteness and accuracy of forming size.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Optics
Baocai Zhang, Haifeng Yang, Fei Xiong, Hao Liu, Jingbin Hao, Xinhua Liu
Summary: Researchers have shown increasing interest in laser shock imprinting (LSI) technology for high-precision 3D microstructure fabrication, but have encountered limitations when using LSI parts in high temperature environments. To address this issue, temperature-assisted laser shock imprinting (TALSI) technology was explored, and experiments were conducted to study the effects of temperature on the mechanical properties of aluminum foil. Further research is needed on the high temperature stability and strengthening mechanisms of LSI technology.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Zeng Tian, Sihai Luo, Liucheng Zhou, Shuyi ZhangLiang, Xiaofeng Dang, Weifeng He
Summary: The study investigates the effects of micro laser shock peening (micro-LSP) on the microstructure, microhardness, surface topography, and fatigue strength of 2A02 aluminum alloy. The results demonstrate that micro-LSP can greatly enhance fatigue strength, regardless of the increased surface roughness caused by the micro-LSP treatment. This improvement is mainly attributed to the combined contribution of high-density dislocations in the slightly remelted surface layer, precipitate transformation, work hardening layer, and grain refinement induced by micro-LSP treatment.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Kerong Ren, Hongyang Liu, Rong Ma, Sen Chen, Siyuan Zhang, Ruixin Wang, Rong Chen, Yu Tang, Shun Li, Fangyun Lu
Summary: This study investigated the dynamic compressive response of a BCC single-phase high-entropy alloy under impact. The results showed that the alloy had high dynamic yield strength and exhibited the Hall-Petch effect. Microstructural analysis revealed that the dynamic deformation of the alloy was controlled by dislocation slip, dislocation proliferation, deformation band intersection, and grain refinement. This study provides valuable insights into the mechanical response characteristics of high-entropy alloys under extreme conditions.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Optics
Zhi-Huan Pang, Meng Liu, Ai-Ping Luo, Yi Xu, Wen-Cheng Xu, Songnian Fu, Zhi-Chao Luo
Summary: We propose a novel mode-dependent gain equalizer using a few-mode chirped fiber Bragg grating (FM-CFBG) to effectively mitigate the mode-dependent gain in an all-fiber 2-mode EDFA. The equalizer based on FM-CFBG offers compact size, low insertion loss, and wavelength scalability, making it meaningful for long-haul MDM transmission.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yiwei Qiu, Chenliang Ding, Gangyao Zhan, Mengdi Luo, Jisen Wen, Mengbo Tang, Chun Cao, Wenjie Liu, Liang Xu, Bihu Lv, Dazhao Zhu, Cuifang Kuang, Xu Liu
Summary: This article proposes a novel method to simultaneously reduce the axial and lateral feature sizes of PPI-DLW. By employing a pseudo 3D hollow focus, a suspended nanowire with an isotropic 30-nm feature size was realized, thereby improving the capabilities of PPI-DLW for fabricating arbitrary 3D structures.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Manzhuo Wang, Jianbo Yue, Zhentao Yao, Tingyu Liu, Xiaoqiang Sun, Yuanda Wu, Daming Zhang
Summary: A silica waveguide 1×8 thermo-optic switch consisting of cascaded three-stage Mach-Zehnder interferometers (MZIs) is successfully demonstrated. The switch utilizes a multimode interference (MMI) coupler in the MMI-MZI 1×2 switch unit for its wavelength insensitivity and favorable fabrication tolerance. The switch design and optimization is based on the beam propagation method (BPM) and implemented using standard CMOS technologies. Experimental results show that the switch meets the requirements for insertion loss and crosstalk at 1550 nm wavelength, and also performs well in a wide wavelength range.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
H. M. de la Cruz, E. D. Hernandez-Campos, E. Ortiz-Ricardo, A. Martinez-Borquez, I. Rosas-Roman, V. Contreras, G. Ramos-Ortiz, B. Mendoza-Santoyo, Cecilia I. Zurita-Lopez, R. Castro-Beltran
Summary: Acoustic levitation is an important contactless manipulation technique in various fields. This study presents an affordable phased-array levitator that can stably trap micrometer dye-doped droplets in the air, enabling the creation of microlasers. The levitated microlasers exhibit comparable optical lasing features to On-a-Chip devices, with a maximum Q-factor of approximately 105 and a minimum lasing threshold of approximately 150 nJ cm-2.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yuqi Wang, Zilong Zhang, Suyi Zhao, Wei He, Xiaotian Li, Xin Wang, Yuchen Jie, Changming Zhao
Summary: This paper investigates the impact of localized defects in SLM devices on structured light generation and demonstrates the reconstructed light field results under different defect states using CGH loaded onto the DMD. The results show that central defects have minimal influence on the reconstructed light field, while edge defects have a significant impact. This study expands the application scenarios for the generation of structured light beams with SLM.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Shihao Gou, Danping Huang, Shipeng Liao, Fan Luo, Yang Yuan, Liang Liu, Xiaomei Wen
Summary: This paper proposes an online intelligent detection method for cable pitch defects in the field of optical cable manufacturing. The method utilizes a multi-sensor fusion image acquisition platform and deep learning technology to achieve accurate detection of pitch defects in optical cables.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Tun-Yao Hung, David W. U. Chan, Ching-Wei Peng, Chi-Wai Chow, Hon Ki Tsang
Summary: We present the first experimental demonstration of a high-capacity short-reach optical communication link which utilizes LSTM and DNN to achieve 300 Gbit/s 8-level pulse amplitude modulation (PAM8) generated by a single microring modulator. The experimental results show that 300 Gbit/s and 270 Gbit/s PAM8 modulation can be achieved at back-to-back and after 1 km transmission respectively.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Long Zhang, Li Pei, Jianshuai Wang, Jingjing Zheng, Kaihua Hu, Zhiqi Li, Tigang Ning, Jing Li, Li Zhong, Ruisi He
Summary: The amplification of long-haul mode division multiplexing (MDM) transmission systems is currently achieved through three steps, which can result in complexity and degraded transmission performance. To address this issue, this paper proposes an in-line few-mode erbium-doped fiber amplifier (FM-EDFA) based on cladding pumping, which enables simultaneous amplification and transmission in MDM systems. Experimental results demonstrate that the in-line FM-EDFA has excellent performance and shows great potential for practical long-haul transmission systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Chong Wang, Miaomiao Li, Jiahao Yang, Bingli Zhu, Jianghao Han, Wenbin Dang
Summary: This paper introduces the design of drive circuits using step recovery diodes and RF bipolar transistors to produce narrow pulse lasers, achieving the reduction of system size, power consumption and cost.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ziqian Zhang, Liangyu Zhao, Chaorun Si, Yang Tian, Shilin Xu
Summary: A Hastelloy C276 coating was prepared on a martensitic stainless-steel substrate using laser melting deposition, resulting in a coating with high resistance to cavitation erosion. The coating exhibited a thick, progressively changing grain morphology from bottom to top, and the grains grew in a specific angle to the substrate plane. A compositional mixing zone was formed at the interface, forming a stable metallurgical bond. The coating showed a significantly improved hardness and enhanced resistance to cavitation erosion compared to the substrate.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Cui-Hong Li, Chao-Xiong He, Yuan-Yuan Ma, Jin-Chuan Wang, Ying Dong, Shao-Chong Zhu, Xiao-Wen Gao, Hui-Zhu Hu
Summary: In this paper, a non-contact optical measuring method for characterizing nanoparticles using optical tweezers is presented. The method relies on the optical polarization and scattering of nanoparticles, providing insights into both shape and size parameters. Experimental results show that the method can accurately measure the shape and size of nanoparticles, making it an effective tool for identifying and studying individual nanoparticles.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Magdalena Zieba, Cuma Tyszkiewicz, Katarzyna Wojtasik, Krystian Pavlov, Pawel Chaber, Ewa Gondek, Jacek Niziol, Roman Rogozinski, Pawel Kielan, Pawel Karasinski
Summary: This work presents a study on low-loss waveguide layers for planar evanescent wave sensor applications. Crack-free SiOx:TiOy composite layers with refractive indices of approximately 1.65 were fabricated using a sol-gel method and dip-coating technique. The fabricated layers exhibited good waveguide properties and optical homogeneity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yali He, Jiao Tang, Zhongyang Li, Yaowu Hu
Summary: In this paper, a lithography-free broadband absorbing metasurface consisting of Ag nanoparticles with ultrafine nanogaps is demonstrated. The experimental results and numerical simulations show that the horizontally compressed Ag nanoparticles possess smaller nanogaps for high sensitivity, uniformity, and stability. The novel substrate also exhibits insensitivity to the incident or observation angle in an ambient environment and has promising practical applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Linqing Li, Chengwei Yang, Zhuo Wang, Kun Xiao, Rui Min
Summary: In this study, a stretchable polymer optical fiber with a sandwich structure was proposed for sleep monitoring. The fiber improved the pressure sensitivity of the mattress and enabled the measurement of respiratory rate, heart rate, and body motion information.
OPTICS AND LASER TECHNOLOGY
(2024)