Article
Optics
Sunderlal Singh Sanasam, G. l. Samuel
Summary: This paper reports on the application of femtosecond laser for modifying surface wettability without significant chemical modification, by tuning the surface morphology. The study shows the ability to achieve both hydrophilicity and hydrophobicity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yasemin Gundogdu, Sami Dursun, Serap Yigit Gezgin, Hamdi Sukur Kilic
Summary: Green synthesis based nanoparticle production methods and water purification techniques were used to synthesize ZnO and Ag nanoparticles, and applied in water purification. Experimental results showed that a composite photocatalyst containing 6.0 wt% Ag exhibited a 68.62% higher rate constant value in degrading methylene blue dye molecules compared to pure ZnO nanoparticles under visible light.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Konstantinos Tsimvrakidis, Symeon I. Tsintzos, James C. Gates, Peter G. R. Smith, Ali W. Elshaari, Val Zwiller, Christos Riziotis
Summary: Optical integrated circuits are seen as a promising platform for developing robust and efficient quantum computers. The integration of multiple single photon sources in these circuits is a critical issue for scalability. This study explores the integration of quantum dots embedded in semiconductor optical nanowires in different platforms and reveals limitations and challenges due to low achievable refractive index contrast. Suitable integration approaches with adequate efficiency are demonstrated.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Duo Yang, Jinyuan Tang, Fujia Xia, Shengyu You
Summary: This paper introduces an active design method for constructing the expected bearing capacity of a surface topography. By adjusting the roughness characteristic parameters, the desired surface bearing ratio tp(c) can be achieved. The surface height matrix that satisfies the expected tp(c) and roughness characteristic parameters is calculated using a genetic algorithm. The results show that the method is reliable and the adjustment of roughness characteristic parameters has a significant impact on the surface bearing capacity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Bingxu Zhang, Hui Chen, Yan Liu, Yunfei Meng, Ailin Deng, Xu Wu
Summary: This study investigates the formation of pores in laser welding using Al-Si wires with different Si contents. The results indicate that increasing the Si content in the wire leads to decreased keyhole stability and increased weld porosity. The increased Si content enhances the Reynolds number of the molten pool, making it more susceptible to external disturbances, thus decreasing the stability of the keyhole. In addition, the reduced dynamic viscosity of the molten pool increases the depth-to-width ratio of the keyhole and its opening and closing frequency, ultimately resulting in increased susceptibility to pores formation. Introducing circular oscillating laser and using response surface methodology to determine optimal parameters can control the porosity within an acceptable range.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Xiao Du, Bing Li, Zhuo Zhao, Bingke Jiang, Yupeng Shi, Liuyi Jin, Xiao Jin
Summary: This paper introduces a method for visual anomaly detection that identifies abnormal regions using a reconstruction network and correction branch, and improves the model's predictive and discriminative capacity by utilizing ConvNeXt blocks and channel attention mechanism.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
M. Mohamed Rabik, S. Vasanth, T. Muthuramalingam
Summary: In this study, an attempt was made to improve the cutting process of diode-assisted laser beam machining using an LQR controller. The results showed that the LQR approach produced better kerf width and carbonization compared to the PID controller.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Mohammad Jafari Eskandari, Masoud Araghchi, Hamid Daneshmand, Ali Hadipour
Summary: This work proposes a repeatable, controllable, non-contact, cost-effective, and fast method for measuring the fracture toughness of epoxy resin composites. The notches and pre-cracks for the fracture toughness test were fabricated using a steel razor blade method and a laser ablation method. The results of the laser ablation method were found to have the highest accuracy and reproducibility, with pre-cracking tips that exhibited no plastic deformation. The fracture toughness values obtained by the laser method were in accordance with ISO and ASTM standards, demonstrating their repeatability and accuracy.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Jialang Zhang, Jinghao Wang, Junna Yao, Xinhua Jiang, Lei Gui, Siyuan Zhang, Qiwen Zhan, Anting Wang
Summary: We demonstrate a tunable spectrally-flat multi-wavelength cylindrical vector beam (CVB) fiber laser using a two-mode long-period fiber grating (TM-LPFG) and a re-circulating frequency shifter loop. The laser can produce multi-wavelength CVBs with low power variation and high purity, and exhibits excellent stability.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Negin Piri, Erfan Memarian
Summary: Identification of polymer type is crucial in industry, but traditional methods are laborious and costly. This study introduces a clean and fast approach using optical tools to detect polymeric materials, focusing on textile fibers and yarns. Experimental observations show the potential of this method.
OPTICS AND LASER TECHNOLOGY
(2024)
Review
Optics
De-Rong Sun, Gong Wang, Yunfei Li, Yu Yu, Chengbin Shen, Yulei Wang, Zhiwei Lua
Summary: This paper investigates the application of laser processing in silicon carbide (SiC). Based on the classification of pulse widths, the removal mechanisms of SiC using nanosecond and ultrafast laser are summarized, and the characteristics of laser-drilled SiC and SiC matrix composites with different pulse scales are analyzed. In addition, drilling is performed using lasers of different pulse widths in a liquid-assisted environment, and the drilling parameters are compared. Finally, laser drilling techniques for SiC and SiC matrix composites are summarized and discussed.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Renqin Dou, Lei Huang, Yao Liu, Jinyun Gao, Xiaofei Wang, Deming Zhang, Jianqiao Luo, Wenpeng Liu, Haihe Jiang, Qingli Zhang
Summary: The laser crystals of Nd:YAG and Nd:GdYAG with gradual concentration were grown successfully using a Kyropoulos Similar Method. The laser performance of the grown crystals was characterized, and it was found that pumping along the low concentration end greatly improved the laser efficiency.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Grzegorz Gomolka, Dariusz Pysz, Ryszard Buczynski, Michas Nikodem
Summary: This paper investigates the optical detection of oxygen in the A-band using tunable laser diode spectroscopy and explores the use of hollow-core optical fibers as an alternative to conventional gas absorption cells. The research presents a convenient, robust, and scalable all-fiber setup using a silica anti-resonant hollow-core fiber. The results show successful absorption spectra recording and detection limit achievement for oxygen, as well as the versatility of the sensing approach in simultaneously detecting oxygen and methane.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Jiaqi Chen, Chao Chen, Qi Guo, Jingjing Sun, Jianwei Zhang, Yinli Zhou, Zhaohui Liu, Yongsen Yu, Li Qin, Yongqiang Ning, Lijun Wang
Summary: This study demonstrates an external-cavity semiconductor laser with linear polarization and a narrow linewidth. A birefringent Bragg grating prepared using a femtosecond laser point-by-point technique in a polarization-maintaining fiber is used to provide external-cavity feedback and enable linewidth narrowing. The compact and robust laser achieved high output power and polarization extinction ratio.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Hong Wang, Xiao-Qian Wang, Chao Gao, Xuan Liu, Yu Wang, Huan Zhao, Zhi-Hai Yao
Summary: In this paper, a novel method based on multi-scale light fields singular value decomposition is proposed to achieve high-quality computational ghost imaging under low sampling rates. The method can further reduce the number of measurements as the number of splicing matrices increases.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Heng Wu, Shaojuan Luo, Meiyun Chen, Huapan Xiao, Tao Wang, Chunhua He
Summary: This paper proposes a super-resolution image restoration method for microlens array imaging system (MLAIS) by segmenting the image, aligning sub-images, recovering SR image, and performing gray transformation to enhance image quality.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Guan-Hong Li, Chieh Huang, Feng-Jung Kao, Min-Hsiung Shih, Hao-Chung Kuo, Yi-Jen Chiu, Chao-Kuei Lee
Summary: In this study, supercontinuum generation from 645.3 nm to 851 nm was demonstrated by using a high-order mode and engineering the dispersion within the high nonlinear refractive index material Ta2O5 waveguide. The results show clear potential for applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Tong Chen, Hao Zhang, Miaoling Yang, Yuan Yao, Wei Lin, Shaoxiang Duan, Bo Liu
Summary: In this paper, a dual-core eccentric-hole fiber (DCEHF) microresonator is proposed for achieving single-longitudinal mode (SLM) laser emission. The enhanced pump light field induced by scattering effect of the two fiber cores is utilized in the microresonator. The experimental results show that the proposed microresonator supports highly stable SLM laser emission and possesses several desirable merits.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Peng Wang, Tao Peng, Shuhe Zhang, Fengya Lu, Zhensheng Zhong, Jun Li, Yi Wang, Jinhua Zhou
Summary: In this study, a sparse prior phase unwrapping (SPUP) algorithm was proposed to solve the wrapped phase problem in interferograms. By introducing L0-norm and L1-norm regularizations, the SPUP method exhibited strong denoising ability and high phase fidelity. It could effectively correct uneven background noise and phase shifting, demonstrating great potential in various interferometry measurements.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Hao Zhu, Min Zhang, Weichao Ren, Viboon Saetang, Jinzhong Lu, Yucheng Wu, Kun Xu, Yang Liu, Zhaoyang Zhang
Summary: This study investigates the laser-induced localized and maskless electrodeposition of micro copper structures on p-type silicon surface through simulation and experimental study. It demonstrates the selective enhancing effect of laser irradiation on electrical conductivity via thermal and photoconductive manner. Experimental tests of laser-induced electrodeposition show the effectiveness of the proposed method in producing micro-wires, regional coatings, and complex patterns on silicon surface without a mask. The study discusses the factors affecting the quality of the deposited layer and provides an in-depth analysis of the electrodeposition mechanism.
OPTICS AND LASER TECHNOLOGY
(2024)
