Article
Engineering, Mechanical
Wenjie Wang, Ping Zou, Jilin Xu, Kornel F. Ehmann
Summary: This paper proposes an improved model to analyze the effects of ambient gas on the morphology evolution mechanisms of laser-polished surface. The model expands an existing laser polishing model by considering mass transfer, solutocapillary forces, and chemical reactions. By comparing the laser polishing in air and argon, the influences of velocity field, temperature field, concentration field, melt surface velocity, molten pool surface profile, and surface forces are studied. The contributions of chemical reaction heat, oxygen mass flux, mass transfer, and surface forces are also presented. Furthermore, the model is validated on 304 stainless steel by evaluating polished surface roughness, molten pool depth, and oxygen element distribution.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Analytical
Junyong Zeng, Wei Zhang, Ting Guo, Yan Lou, Wenqi Wang, Zhenyu Zhao, Chao Wang
Summary: This study investigates the mechanism and effect of dual-beam laser polishing on surface roughness reduction through experimental and simulation analysis. The results demonstrate that dual-beam laser processing efficiently reduces surface roughness and reveal the roles of capillary force and thermocapillary force in the polishing process.
Article
Optics
Jilin Xu, Ping Zou, Xue Wang, Anqi Wang, Lu Liu
Summary: Gas shielding is crucial in enhancing the quality of laser polishing. The processing effects of laser polishing with chamber and nozzle gas shielding were compared and analyzed. The influence of flow rate on the surface roughness of the polished workpiece was examined, and the optimal flow rate (Q = 5 L/min) was determined. Further research on nozzle gas shielding laser polishing explored the effects of laser power and scanning speed on surface roughness, demonstrating wider application prospects.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Chaojiang Li, Depiao Liu, Guodong Liu, Shenggui Liu, Xin Jin, Yuchao Bai
Summary: AM metal parts often have defects and rough surfaces, and post-treatment processes are required for materials with corrosion resistance requirements. Laser polishing is an efficient and environmentally friendly technique, but research on its effects on surface morphology, defect formation, and surface characteristics of AM parts is lacking.
OPTICS AND LASER TECHNOLOGY
(2023)
Review
Optics
Jiejing Li, Dunwen Zuo
Summary: Laser polishing is an efficient and non-contact post-treatment technology that has attracted increasing attention in addressing the surface roughness issues of additively manufactured Ti6Al4V alloy. Research shows that laser polishing technology has broad application prospects in aerospace, biomedicine, and other fields.
OPTICAL ENGINEERING
(2021)
Article
Automation & Control Systems
Ke Che, Yanhou Liu, Jian Liu, Juan Ma, Jinguo Han
Summary: By conducting experiments and establishing a three-dimensional transient model, the influence law of the melting pool during laser polishing of Ti-6Al-4V alloy is revealed. The small discrepancy between the simulated results and actual data demonstrates the high reliability of the model.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Debajyoti Bhaduri, Tina Ghara, Pavel Penchev, Soumitra Paul, Catalin Pruncu, Stefan Dimov, David Morgan
Summary: A novel LP strategy was proposed to improve the re-melting of aluminium alloys by introducing a thermally insulating ceramic baseplate, resulting in significant reductions in surface roughness and residual stresses. The study highlights the importance of controlling heat dissipation in laser polishing of thermally conductive materials to achieve desired surface integrity properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Automation & Control Systems
Yusuf Dogan
Summary: CO2 laser glass polishing is an effective method for achieving smooth surfaces, and this study focuses on reducing deformations on the edges of polished silica rod samples. The deformations result from temperature differences and not the beam shape. Various approaches such as masking, laser exposure timing, and changing substrate materials have been proposed to eliminate the deformations, with replacing tungsten with silica proving to be effective.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Astrid Sassmannshausen, Andreas Brenner, Johannes Finger
Summary: Ultrafast pulse laser polishing can achieve fine surface polishing effects by reallocating material from peaks to valleys. Experiments on 1.2738 tool steel show that polishing can significantly reduce surface roughness, achieving a polishing rate of 12.15 cm(2)/min.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Kai Li, Houming Zhou, Zhenyu Zhao, Hao Zhou, Jie Yin, Jingcheng Jin
Summary: This study has developed a two-dimensional axisymmetric model to describe the evolution of polished surface morphology and transient molten pool dynamics in laser polishing. The results show that melt flows are dominated by thermocapillary and capillary forces, with surface temperature lower than evaporating temperatures. Additionally, a model based on moving heat source was used to bring simulation results closer to experimental outcomes.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Chemistry, Physical
Jiantao Zhou, Xu Han, Hui Li, Sheng Liu, Shengnan Shen, Xin Zhou, Dongqi Zhang
Summary: The study investigates the impact of laser polishing on the surface quality of AlSi10Mg material, showing significant reduction in surface roughness and improvement in microhardness. Better surface quality can be achieved by adjusting the parameters of laser polishing.
Article
Materials Science, Coatings & Films
Andrea El Hassanin, Muhannad Ahmed Obeidi, Fabio Scherillo, Dermot Brabazon
Summary: This study explored the possibility of using a CO2 laser for surface polishing of metal Additively Manufactured parts made by Laser-based Powder Bed Fusion. The experiments conducted on vertically built samples showed a significant reduction in surface roughness and an increase in hardness due to changes in microstructure.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Kai Li, Zhenyu Zhao, Houming Zhou, Hao Zhou, Jie Yin, Wei Zhang, Guiyao Zhou
Summary: This paper develops a transient two-dimensional model to study the molten flow behavior of Ti6Al4V alloy during laser polishing, showing the complex evolution of melt hydrodynamics and the impact of surface morphology on molten flow stability and smoothing effect. It further reveals the mechanism of secondary roughness formation on polished surface and the extrusion of molten material by double spiral nest Marangoni convection. The results demonstrate good agreement between predicted surface profiles and experimentally measured surface height data.
Article
Engineering, Multidisciplinary
Zhelun Ma, Qinghua Wang, Jinlong Dong, Zhao Wang, Tianbiao Yu
Summary: This study establishes a thermal model to understand the processing mechanism of laser-assisted grinding (LAG) of alumina ceramic. An orthogonal experiment is designed for process optimization, and the advantages of LAG are demonstrated through surface topography analysis.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Engineering, Industrial
Yufan Liu, Wentai Ouyang, Haichen Wu, Zifa Xu, Liyuan Sheng, Qi Zou, Mina Zhang, Wenwu Zhang, Junke Jiao
Summary: In this study, a hybrid laser polishing technology was used to improve the surface quality of Inconel 718 alloy components. The results showed that the hybrid laser polishing process significantly improved the surface quality by refining the grains and secondary phases, and increasing the surface hardness.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
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)