Article
Optics
Shuo Zhang, Yong Bi, Weinan Gao, EnLong Zhang, Xia Zhao, Minyuan Sun, Yuan Yuan
Summary: A high-power hollow laser beam with excellent propagation properties can be achieved by using a tapered fiber with certain parameters. The proposed technique is simple, flexible, and easy to control and operate.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Liang Liang Zhang, Yang Zhou, Lin Jie Zhang, Jie Ning, Yun Jun Sun, Suck-Joo Na
Summary: The low strength and plasticity of molybdenum fusion welding joints, caused by grain boundary brittleness, is a major obstacle to their application in engineering structures. By using laser beam welding, the tensile strength of unalloyed joints reached only 169.8 MPa. However, with Niobium (Nb) alloying, the maximum tensile strength could reach 426.7 MPa. This is because Nb reduces the oxygen content and strengthens the grain boundaries through second-phase strengthening. XPS and TEM analysis confirmed the presence of Nb2O5 and NbC in the fusion zone (FZ) of Nb alloyed joints. SEM and EBSD observations showed reduced MoO2 and precipitation of NbC at the grain boundaries, unlike the unalloyed joints where lamellar MoO2 was observed.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Physics, Fluids & Plasmas
Abdul Jabbar, Mahmood Akhtar, Javed Iqbal, Shaukat Mahmood, Muhammad Aslam Baig
Summary: This study focuses on finding an optical window where plasma is optically thin and determining plasma parameters more reliably. By using different laser wavelengths and analyzing the variations in electron number density and excitation temperature under different conditions, the study provides valuable insights into the behavior of plasma.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Optics
Niccolo Bigagli, Daniel W. Savin, Sebastian Will
Summary: We present a scheme for laser cooling of C-12(2) and provide calculations for the branching ratios of cycling and repumping transitions. Our results show that C-2 cooling, using specific bands, is achievable under realistic experimental conditions. This work opens up possibilities for cooling molecules with carbon-carbon bonds and potentially enables quantum control of organic molecules.
Article
Engineering, Electrical & Electronic
Luyu Wang, Zhiyang Xie, Beibei Pan, Zhiqi Zhou, Linze Li, Xinbo Zou, Haiming Ji, Baile Chen
Summary: We present a novel 850 nm high-speed photodetector that can simultaneously achieve high-speed data acquisition and electrical power generation. It is based on a GaAs/AlGaAs modified uni-traveling carrier photodetector (MUTC-PD). Compared to traditional p-i-n photodetectors with the same absorber thickness, the MUTC device exhibits a high 3 dB bandwidth of 11.9 GHz and a power conversion efficiency of 38.5% under a forward bias of +0.7 V. This exceptional performance is achieved by incorporating the MUTC structure on LPC devices. The device is expected to find applications in simultaneous lightwave information and power transfer, offering a potential solution for next-generation combined power and data transceiver modules.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Shu-Chun Chu, Yu-Xian Fu, Kuo-Chih Chang, Cing-Yi Huang
Summary: This research proposed a simple method to design the projected phase boundary of the SLM for generating a geometric shape structure light field. The phase boundary design effectively suppressed the reflection of high-inclination angle light, and experiments showed that the laser output energy distribution closely matched geometric structures.
Article
Optics
Tianran Zheng, Hongjie Liu, Fang Wang, Yong Xiang, Ye Tian, Zhufeng Shao, Yuan Chen, Dongxia Hu, Xiaodong Yuan
Summary: To address the issue of beam dump damage at high output energy, the initial laser-induced damage threshold of a new optical absorption material was tested. A new type of laser beam dump was designed based on this material using geometrical optics and light-field distribution analysis.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jia-Nuo Li, Xiao-Hui Li, Wen-Dong Yao, Wenlong Liu, Sheng-Ping Guo
Summary: Novel sulfides AAgGa(6)S(10) with unique structures and excellent optical properties were synthesized via solid-state reaction, showing great potential for a wide range of applications.
CHEMICAL COMMUNICATIONS
(2021)
Article
Optics
Francesc Bravo-Montero, David Castells-Rufas, Jordi Carrabina
Summary: This paper presents a system using a matrix of laser beams controlled by high-performance computing platform to overcome the speed bottleneck in laser marking. Industrial solutions presented in this paper can achieve higher speed and resolution for image printing on printing substrates. Further increase in speed is possible by investing in additional laser beams.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Weiyang Zhou, Ke Jin, Ran Zhang
Summary: In this study, a simple and rapid voltage-location global MPPT method is proposed for PV arrays under Gaussian laser beam conditions, aiming to improve tracking efficiency.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
M. A. Eryomina, S. F. Lomayeva, E. V. Kharanzhevsky, V. V. Tarasov, I. N. Burnyshev
Summary: This work investigates the phase composition evolution of niobium-carbohydride- and copper-based powders prepared via wet ball milling under heat treatment. High-speed selective laser sintering on iron substrates results in gradient coatings with high wear resistance due to the presence of different hardness phases and copper inclusions working as a solid lubricant in tribological tests.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Energy & Fuels
Longyu Xia, Gaosheng Wei, Gang Wang, Liu Cui, Xiaoze Du
Summary: A solar fiber optic lighting and photovoltaic power generation system based on spectral splitting technology (SSLP) is proposed and tested in this study. The system divides sunlight into different wave bands, using visible light for optical fiber illumination and near-infrared radiation for photovoltaic power generation. The experimental results showed that the system has an average lighting efficiency of 15.1% and an average power generation efficiency of 6.1%, with an overall average efficiency reaching 29.5%.
Article
Engineering, Electrical & Electronic
Shuo Li, Zhanzhi Liu, Ailing Zhang, Honggang Pan, Radu-Florin Stancu, Yuanli Yue, Ruibo Zhang, Chao Wang
Summary: A novel microwave photonic approach is proposed and demonstrated for real-time and high-speed interrogation of optical fiber sensors. The method utilizes optical injection in a semiconductor laser and simple passive microwave frequency filtering. Experimental results show that high interrogation speed and measurement sensitivity have been achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Victor V. Kotlyar, Alexey A. Kovalev, Eugeny G. Abramochkin
Summary: If a vortex propagation-invariant beam is given by all its intensity nulls, the topological charge (TC) can be easily defined as the sum of the topological charges of all optical vortices in these nulls. However, if a propagation-invariant beam is given as a superposition of several light fields, determining its TC becomes a complicated task. In this study, we derive the topological charges of four different types of propagation-invariant beams and demonstrate that the TC remains unchanged when certain parameters of the beams are altered.
Article
Optics
Lisa Ackermann, Clemens Roider, Matthias Gehring, Kristian Cvecek, Michael Schmidt
Summary: A phase-only spatial light modulator (SLM) is a powerful tool used to shape arbitrary intensity distributions, but it is limited in controlling the full complex light field, resulting in the presence of speckle patterns. We propose a method using liquid crystal on silicon SLM and a single phase mask to achieve near-perfect and highly efficient speckle averaging. The method involves high-speed scanning of the laser beam using a galvanometer scanner and compensating for the scanning movement to maintain a static target image.
OPTICS AND LASERS IN ENGINEERING
(2023)
