Article
Engineering, Manufacturing
Chang Liu, Cheng Li, Lei Gao, Renfeng Shen
Summary: This study proposes a two-dimensional transient numerical model for micro-hole drilling of 2.5D C/SiC composites with a picosecond laser. The model accurately depicts the evolution of hole shape, including entrance, exit diameter, hole taper, and hole profile dynamics. The study also identifies thermal damage as the main cause of hole quality variation.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Optics
Kaibo Xia, Naifei Ren, Qing Lin, Tao Li, Fuqiang Gao, Huayu Yang, Shiwen Song
Summary: The experimental investigation showed that transverse magnetic assistance improved both the quality and efficiency of femtosecond laser through-hole drilling. The magnetic field changed plasma distribution, reduced plasma density, and weakened the plasma's shielding effect, resulting in better drilling outcomes.
Article
Optics
Tong Zhou, Yuchao Hong, Zheng Fang, Walter Perrie, Yang Fei, Youyou Hu, Stuart Edwardson, Geoff Dearden
Summary: An experimental and numerical study on the laser ablation of 316 L stainless steel was conducted, and the results were compared with theoretical simulations. The study found good agreement between theory and experiment for both single-pulse and multi-pulse ablation. The findings have important implications for predicting the performance of multi-pulse laser processing.
Article
Optics
Peng Wang, Zhen Zhang, Denghua Liu, Wenzhe Qiu, Yi Zhang, Guojun Zhang
Summary: Carbon fiber reinforced plastic (CFRP) is widely used due to its excellent mechanical properties and corrosion resistance. However, drilling micro-holes in CFRP can be difficult due to its anisotropy and inhomogeneity. Traditional methods result in poor performance, while laser machining shows great potential in drilling CFRP micro-holes without tool wear and fiber pull-out, but faces challenges of large taper and recast layer. This study proposes laser induced plasma micro-drilling (LIPMD) to reduce taper and improve surface integrity. Analysis shows that LIPMD has advantages over laser in air (LIA) in terms of sidewall surface quality, taper, roundness, and surface integrity. The investigation demonstrates the applicability of LIPMD as a potential process for improving machinability and surface integrity of CFRP material.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jose Manuel Lopez, David Munoz-Martin, Juan Jose Moreno-Labella, Miguel Panizo-Laiz, Gilberto Gomez-Rosas, Carlos Molpeceres, Miguel Morales
Summary: This study investigates the peen forming of thin stainless steel metal foils using a solid-state ps-pulsed laser. The effects of pulse energy, treated area, distance between lines, and laser repetition rate on bending angle and radius of curvature were studied. High repetition rates prevent the sample from cooling down, which leads to negligible bending. FEM simulation and experiments demonstrate that the increase in temperature due to high repetition rate can relax the stresses induced by laser peen treatment, preventing bending in the sample.
Article
Chemistry, Multidisciplinary
Jiannan Jiao, Donglei Zhou, Shufan Li, Mun Ji Low, Yi Gao, Jianing An, Pei-Chen Su, Seung-Woo Kim, Seungchul Kim, Kyujung Kim, C. S. Suchand Sandeep, Young-Jin Kim
Summary: A high repetition-rate upconversion green pulsed micro-laser was demonstrated by using lanthanide-doped upconversion nanoparticles prepared via femtosecond-laser direct writing. The unique structure of the micro-laser allows for coherent photon build-up and amplification of third-harmonic ultra-short seed pulses. This technology has potential applications in on-chip optical information processing, high-throughput microfluidic sensing, and localized micro light sources for optical memories.
Article
Mechanics
Nengru Tao, Genyu Chen, Wenjun Fang, Mingquan Li
Summary: Ultra-short pulsed laser drilling can improve the processing surface quality of CFRP laminate, but it often leads to hole taper. In this study, a theoretical model is established to understand the mechanism of hole taper formation and develop a corresponding regulatory strategy. The bowl-bottom effect, a sudden increase of hole taper close to the hole exit, is demonstrated for the first time through comparative laser drilling experiments. The formation mechanism of the bowl-bottom effect and its impact on drilling efficiency and heat-affected zone are investigated.
COMPOSITE STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Huu Dat Nguyen, Enrique Moreno, Anton Rudenko, Nicolas Faure, Xxx Sedao, Cyril Mauclair, Jean-Philippe Colombier, Razvan Stoian
Summary: A highly efficient drilling process is achieved in non-transparent metallic materials using non-diffractive ultrafast Bessel beams. Compared to Gaussian beams, the Bessel beams demonstrate twofold higher drilling efficiency due to their ability to self-replicate and reconstruct along the axis, bypassing potential obstacles.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Levent Subasi, Mustafa I. Gokler, Ulas Yaman
Summary: Water jet guided laser drilling can clean and cool the machining region simultaneously, improving overall quality; Experiments with different hole diameter values are conducted to investigate the relationship between machining efficiency and hole depth; A real-time measurement method based on acoustic signals is proposed, showing a correlation between ultrasound emission and material removal in a water jet guided laser machine.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Yujie Han, Junjie Zhang, Xiaohui Wang, Tao Sun
Summary: In this study, numerical simulations and experiments were performed to investigate the ultraviolet nanosecond laser micro-drilling of 1 mm diameter through micro-holes on copper foil. The relationship between laser processing parameters and hole taper and circularity was explored. The study provided insights into the formation mechanisms of hole taper and revealed the optimal laser processing parameters for manufacturing 1 mm diameter through micro-holes on copper foil.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Bingnan Shi, Jiatong Li, Shuai Ye, Feifei Wang, Jiajia Mao, Xiaohui Sun, Hongkun Nie, Kejian Yang, Baitao Zhang, Jingliang He
Summary: The modified Frantz-Nodvik equation considering the pulse repetition rate for continuous-wave end-pumped picosecond laser amplifier was developed for the first time. A simple finite-element slice model was established to simulate the output characteristics. Experimental results confirmed the validity of the theory and model.
OPTICAL ENGINEERING
(2021)
Article
Automation & Control Systems
Matthias Putzer, Norbert Ackerl, Konrad Wegener
Summary: Ultra-short pulsed laser ablation can generate micro-holes, with a study showing the benefits of green wavelength for copper ablation and the use of circular drilling for micro boreholes and through-holes. High-resolution micro-computed X-ray tomography reveals the evolution of micro-holes and adjacent geometrical transformations during laser drilling.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Mingliang Long, Haifeng Zhang, Rong Zong Yu, Zhibo Wu, Si Qin, Zhongping Zhang
Summary: An alternate working mode is proposed to solve the problem of laser echo interference in satellite laser ranging. Through experiments with the UH-SLR system, it is demonstrated that accurate measurements of satellites in different orbits can be achieved both during the day and at night.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Ceramics
Chang Liu, Xianze Zhang, Guofeng Wang, Zhifang Wang, Lei Gao
Summary: This paper investigates the ablation evolution behavior of 2.5D Cf/SiC composites, observing the ablation evolution process and recast layer structures at different fiber angles through millisecond laser processing. The study reveals the different stages of ablation evolution experienced by fibers and the diversity of recast layer structures.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Kai Zeng, Xian Wu, Feng Jiang, Jinxian Zhang, Jinxing Kong, Jianyun Shen, Hairong Wu
Summary: In this study, micro hole drilling experiments were performed on polycrystalline Nd:YAG using a polycrystalline diamond micro drill. The results showed that the hole diameter was slightly larger than tool diameter, and the edge chipping at the entry and exit holes differed. The hole surface quality mainly depended on the proportion of the brittle fracture to ductile removal surface.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)
