Article
Optics
Bo Ma, Xiangdong Gao, Yijie Huang, Yanxi Zhang, Yiwei Huang
Summary: This study investigates the effects of different pulse shapes on the microstructure, mechanical and electrical properties of Al-Cu lap joints. The results provide a detailed understanding of how the pulse shapes influence the metal mixing and the formation of intermetallic compounds (IMCs). The study offers theoretical guidance on utilizing pulse shape modulation in laser welding to achieve optimal mechanical and electrical properties in typical joints between Al tabs and Cu busbars.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Zhiteng Wang, Yifu Mao, Xiaohui Ling, Lifu Zhang
Summary: This study investigates the existence regions and dynamics of quartic self-similar pulses (QSSPs) and dissipative pure-quartic-solitons (DPQSs) in a mode-locked fiber laser with pure positive fourth-order dispersion (FOD). It is found that the laser tends to emit QSSPs with high nonlinear gain and generate DPQS pulses with low nonlinear gain. The energy carried by QSSP is higher than that of DPQS pulse due to the instability caused by excessive pulse pedestal.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Wei Huang, Shi-Ting Cao, Wentao Zhang, Shan Yin, Jiaguang Han
Summary: This paper investigates the resonant frequency shifting of metamaterials caused by the coupling effect. The split ring resonators (SRRs) are used to generate magnetic dipoles by decreasing the distance between them, thus increasing the coupling. The authors analyze the difference in resonant frequency shifting between two scenarios and verify their results through simulations and experiments. Additionally, bound states in the continuum (BIC) are established using two slightly different SRRs, and the resonant frequency shifting of BIC follows the predicted rule.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ragini Singh, Wen Zhang, Xuecheng Liu, Bingyuan Zhang, Santosh Kumar
Summary: In this study, a highly sensitive and selective method for detecting tyramine using localized surface plasmon resonance (LSPR) optical fiber-based sensor is proposed. The sensor is functionalized with MXene and gold nanoparticles to increase the surface area for enzyme immobilization and enhance the sensor performance. The results demonstrate that the developed sensor efficiently detects tyramine with high specificity due to the presence of the tyrosinase enzyme. Further studies reveal the stability, repeatability, and reusability of the proposed biosensor, with a detection limit of 6.96 μM and a sensitivity of 0.0385 nm/μM. Therefore, the optical fiber-based sensor has significant potential for detecting the presence of tyramine in various agricultural and food samples.
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
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
Chao Wang, Yukui Cai, Jiahang Li, Kuanxin Tang, Qinghua Song, Bing Wang, Zhanqiang Liu
Summary: This paper presents a fundamental study on the interaction between femtosecond laser and copper, utilizing a 2D two-temperature model that incorporates temperature-dependent optical and thermophysical properties and three phase transitions. The results show that the reflectivity at the interface decreases, while the optical penetration depth and the ballistic electron penetration depth increase significantly during laser irradiation. The temperature evolution of the top surface can be divided into 4 stages for the electron subsystem and 5 stages for the lattice subsystem, and a temperature peak is observed near the surface.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Shengnan Guan, Jierong Cheng, Yang Yang, Zhiyu Tan, Haifeng Xu, Fei Fan, Qiye Wen, Shengjiang Chang
Summary: The article introduces a dynamic multi-beam steering strategy that uses rotating metagratings and diffraction to scan and control the direction of four beams. Experimental results demonstrate that this strategy can achieve symmetric or asymmetric directional control of THz four beams, with a large field of view and high efficiency.
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
J. Nobre-Pereira, V. S. de Angelis, L. A. Ambrosio, M. Zamboni-Rached
Summary: This paper introduces the Frozen Wave method of Bessel beams and its application in modeling optical tweezers. By superposing Bessel beams, the longitudinal intensity pattern of the resulting beam can be shaped along the propagation axis. The paper presents an analytical closed solution for the micrometer zero-order Frozen Wave beam and studies the case of arbitrary topological charge.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Farhad Heydari, Fatemeh Asjadi, Farshad Esmaeilian
Summary: A superhydrophobic coating was manufactured on laser-patterned magnesium surfaces. The effect of polypropylene concentration, laser power, distance, and angle on the coating's properties were investigated. SEM images confirmed the hierarchical roughness of the samples, which correlated with the measured contact angles. Models considering air trapping and spattered melt as rough surfaces provided the most accurate predictions.
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
Aiziheerjiang Abulikemu, Subinuer Yakufu, Yu Xia Zhou, Taximaiti Yusufu
Summary: We present a high beam quality, mid-infrared, wavelength tunable, idler-resonant optical vortex parametric oscillator using a MgO:PPLN crystal. By transferring the orbital angular momentum of the pump field to the idler field, we achieved high beam quality mid-infrared vortex beam emission. The wavelengths of the signal and idler vortex outputs could be tuned by changing the crystal temperature.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Hongze Gao, Zicheng Wang, Guochen Wang, Wei Gao, She Li, Zhuo Wang, Bo Cheng, Kaidi Tian
Summary: The study of chiral fibers for optical fiber communication and sensing is important due to the lack of cross coupling effects in circularly polarized light. However, the fabrication requirements for chiral fibers result in higher costs. In this research, the authors successfully demonstrated the fabrication method of dielectric chiral fiber and showcased its low-cost and high-performance characteristics.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Xin Li, Jiaqing Zhao, Sixuan He, Zhengming Zhang
Summary: This study proposes a convenient one-step calibration method for improving the measurement accuracy of stereo surface deformation using the bi-prism bi-telecentric single lens stereo digital image correlation (BBSL Stereo-DIC) system. The method eliminates the positional dependence on the bi-prism by incorporating the bi-prism's attitude parameter and principal point coordinates as additional intrinsic parameters, making the calibration process more convenient for DIC users.
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
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
Yuhua Xiao, Yan Teng, Chun Li, Tengyu Wang, Haonan Chen, Yifan Zhu, Shengzhu Fu, Ling Jiang
Summary: This paper presents an innovative design of a C-shaped SRR polarization converter using NbN superconducting material, which exhibits high PCR and wide frequency range in its superconducting state. The structure also demonstrates dynamic modulation characteristics and adjustable beam intensity. These features are validated experimentally and provide new insights for the design of dynamically tuned polarization converters and the application of NbN.
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
Huaile Liu, Haojie Yang, Zhaopeng Tong, Wangfan Zhou, Xudong Ren
Summary: Laser peen forming is a precision forming technique that uses nanosecond pulsed laser-induced shock waves to bend, shape, align, and restore components with remarkable precision. This study developed a new process approach by combining laser annulus and strip peening to enhance the consistency of forming curvature in perforated sheets. The study compared and analyzed the effectiveness of two peening strategies under different sequences and analyzed the residual stresses using numerical models. The results showed that the peening sequence and strategy affected the radius of curvature and the distribution of residual stresses.
OPTICS AND LASER TECHNOLOGY
(2024)
