-
Effect of laser micromachining crater-array–multi-grooves on the bonding strength and failure mode of aluminum alloy adhesive joints Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-05 Chong Zhang, Yongkang Zhang, Lingyu Chen, Yujiao Chen
The strength of aluminium (Al) alloy adhesive joints is essential for aerospace, ship and automotive applications. This study proposes the two-step laser processing of crater-array–multi-groove (CAMG) to maximize the shear strength of adhesive joints for 7075-T6 aluminum alloys. Firstly, the effects of CAMG feature parameters (groove pattern, groove spacing , and groove depth ) on the surface roughness
-
Topological waveguide-cavity coupling system based on valley photonic crystals Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-05 Yong-Feng Gao, Yi-Han He, Yue Li, Subinuer Rouzi, Meng-Cheng Jin, Yue He, Shu-Yang Zhou
Valley photonic crystals (VPCs) possess remarkable properties, being capable of supporting topological edge states and corner states. Herein, we propose a sandwich-like structure consisting of two layers of silicon-based triangle air hole topological VPCs, and an interlayer of semimetal (SM) photonic crystal. The edge state in the proposed structure has demonstrated a robust behavior even in the presence
-
High power ring spot adjustable fiber combiner based on (6 + 3) × 1 structure Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-05 Zhiqiang Wan, Shan Yu, Ziye Hu, Guanghua Yang, Yongjun Xu, Jilong Tang, Zhipeng Wei
Aiming at the problem that the ring beam mode adjustable signal combiner with a single center port structure limits the output power of the laser beam in the inner ring of the laser. A new all-fiber structure (6 + 3) × 1 signal combiner is designed, which can independently carry more than 3 kW of power at each input port, and the output fiber is a ring-shaped dual-core fiber. The tapered fiber bundle
-
Detection of nickel and zinc ions in aqueous solution by phase-shifted long period fiber grating functionalized with polyacrylic acid and chitosan Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Ting Liu, Xinyi Dai, Qiushun Zou, Xunsi Wang, Shixun Dai, Peiqing Zhang
Ultrasensitive detection of heavy metal ion concentrations in drinking water is highly relevant for protecting human health and environmental monitoring. In this study, we propose and experimentally validate a long-period fiber grating (LPFG) chemical sensor for detecting nickel (Ni) and zinc (Zn) ions. A sensitive film composed of chitosan (CS) and polyacrylic acid (PAA) was used and assembled on
-
High-sensitivity distributed temperature and salinity sensor based on frequency scanning Φ-OTDR and polyimide-coated polarization maintaining fiber Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Yuyao Wang, Hua Zheng, Huan Wu, Dongmei Huang, Changyuan Yu, Chao Lu
A highly sensitive distributed optical fiber sensor based on frequency scanning phase-sensitive optical time domain reflectometry (Φ-OTDR) for simultaneous salinity and temperature measurement was proposed and experimentally demonstrated. A bow-tie polarization-maintaining fiber (PMF) with a polyimide coating is utilized as the sensing fiber, as its coating acts as a hygroscopic material, which can
-
Surrounding ambient features analysis of existing communication optical cable by using DAS Big-Data Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Yage Zhan, Wenzhuo Zhang, Long Xu, Min Han, Zhaoyong Wang, Junqi Yang, Yifan Liu, Qing Ye
Distributed optical fiber acoustic sensing technology (DAS) can transform existing communication optical cables into spatially continuous sensing array, and has strong application potential in geophysics and nature disaster monitoring. This paper proposes a DAS big-data analysis method to obtain the surrounding ambient features along the existing communication optical cable. After being synthetically
-
Theoretical research on violet optical privacy protection based on epsilon-near-zero angle selection principle Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Yue-Qi Tang, Bao-Fei Wan, Ting-Hao Zhang, Na Pei, Hai-Feng Zhang
In this paper, an optical privacy protection (OPP) structure is designed for violet light, leveraging the unique epsilon-near-zero (ENZ) properties of YaBaCuO material along with an anti-reflection structure. To tackle the challenges posed by temperature regulation constraints, the zinc fluoride barium lanthanum aluminum magnesium hexafluoride glass is incorporated as the background medium. The findings
-
Simultaneous ICI and SSBI suppression in microwave photonic SEFDM transmission links using an iterative algorithm with random displacement of constellations Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Yu Chen, Yang Chen
An iterative algorithm is proposed to simultaneously eliminate both the inter-carrier interference (ICI) and the signal-signal beat interference (SSBI) in the microwave photonic spectrally efficient frequency-division multiplexing (SEFDM) transmission systems. The received signal is iteratively modified to minimize the distortion. In each iteration, the modified signal undergoes the fast Fourier transform
-
High sensitivity high precision MMFBG based on waist-enlarged bitaper for temperature measurement Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-04 Na Zhao, Huan Wang, Qijing Lin, Kun Yao, Zhongkai Zhang, Longbo Li, Yi Chen, Yunjing Jiao, Fuzheng Zhang, Qingzhi Meng, Bian Tian, Libo Zhao, Zhuangde Jiang
A high precision multimode fiber grating sensor (MMFBG) is studied. The developed multimode fiber Bragg grating based on waist-enlarged bitaper can excite stable multimode and keep multiple reflection peaks in the reflection spectrum. The virtual peak demodulation method based on MMFBG can reduce the temperature measurement error. When the light is introduced into the sensor, the waist-enlarged bitaper
-
Molecular dynamics simulation of microstructural evolution and mechanical behavior of titanium alloy subjected to laser shock peening Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-02 Jing Li, Weining Lu, Lin Liu, Shu Huang, Min Ji, Yujie Zhao
In this study, the main purpose was to investigate the microstructural evolution and mechanical behavior of titanium alloy treated by laser shock peening using the piston impact method. The molecular dynamics model was established utilizing the Atomsk software. Based on the large-scale atomic/molecular massively parallel simulator, the simulation process of laser shock peening on polycrystalline titanium
-
Laser micro-joining of Al and Cu foils with high strength and ductility Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-02 Weizhe Du, Guochen Dong, Demin Zou, Xiaoyao Cui, Rongshi Xiao, Jiejie Xu, Ting Huang
The micro-joining of Al foil and Cu foil is crucial for various industrial applications, such as manufacturing power lithium-ion batteries packs for electric and hybrid vehicles. An ongoing challenge in this process is the unsatisfactory joint strength, attributed to crack susceptibility and poor joint ductility. This issue is primarily caused by the continuous formation of an intermetallic compounds
-
Internal and external panoramic system for vibration measurement on carbon fiber pipes Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-02 Yubo Liu, Weiling Zhang, Yancheng Ma, Jipeng Zhang, Wen Yang, Xianyue Gang, Xiangjun Dai
A panoramic vibration measurement system was proposed to determine the out-of plane amplitude of the internal and external surfaces of carbon fiber pipes. A conical mirror and a concave mirror were positioned inside and outside the pipe to allow the synchronised reflection, providing a complete internal and external 360-degree view. Based on coordinate transformation, the three-dimensional internal
-
Multi-parameter sensor based on cascaded multicore FBGs and an FPI for bending, temperature and pressure measurements Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Hongye Wang, Siyun Fan, Lingzhi Meng, Qi Xia, Tingting Yuan, Xiaotong Zhang, Libo Yuan
A multi-parameter sensor based on cascaded multi-core fiber Bragg grating (FBG) and Fabry-Perot interferometer (FPI) is proposed. The sensor consists of a single-mode fiber (SMF), a four-core fiber (FCF), and a hollow fiber (HCF) filled with polydimethylsiloxane. The HCF is fused at the end of the FCF to form an FPI. Through thermal diffusion technology (TDT), the all-fiber single-channel measurement
-
Optimizing scanning trajectory for laser nanoprinting of micro-optical Fabry-Perot interferometer integrated on single-mode fiber end-face for gas flow sensing Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Fei Xie, Lili Liang, Qingbin Zhou, Meiling Jiang, Li-Peng Sun, Long Jin, Xiangping Li, Yaoyu Cao
Here, we demonstrate a high performance fiber-tip gas flow sensor by integrating an optical Fabry-Perot interferometers onto single-mode fiber end-face with all-in-one 3D laser nanoprinting technique. The device comprises of a suspended disk-shaped reflection polymer diaphragm, along with eight folding-shaped supporting pillars. The diaphragm was fabricated with a diameter of 50 μm and a thickness
-
Triple narrow-spectrum enhanced multiparameter sensor based on asymmetric MIM waveguide for gas and liquid sensing Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Haojun Zhao, Jiansen Du, Shang Wang, Xi Wang, Tiqiang Zhang, Ruitao Yu, Zongtao Chi, Bin Wang
In this paper, an enhanced multiparameter sensor based on a metal–insulator-metal (MIM) waveguide structure with surface plasma polarization is proposed. We initially establish a coupling model consisting of a bus waveguide containing a barrier, and E-shaped and rectangular resonant cavities. It can generate asymmetric triple Fano resonance and achieve independent tuning of the resonance peaks by adjusting
-
Femtosecond mode-locked laser at 1.5 μm region using topological semimetals NbAs nanosheets Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Zhen Li, Hui Long, Min-Ru Wen, Hua-Feng Dong, Li-Li Tao, Fu-Gen Wu, Li Chen
For the first time, NbAs nanosheets are used as a saturable absorber for fiber laser mode locking, achieving high efficiency saturation absorption. NbAs nanosheets are prepared through a liquid-phase exfoliation method, and the following nonlinear optical testing is performed with a self-built twin balanced detection device, with a modulation depth of 3.92 %. Additionally, NbAs nanosheets are embedded
-
Implementation and precision of CFRP geometric configurations before adhesive bonding repair based on 1064 nm infrared pulsed fiber laser ablation Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Wenfeng Yang, Disheng Wang, Yu Cao, Shaolong Li, Lin Wang, Huazhong Zhang
Before the adhesive bonding repair of the aircraft’s CFRP (Carbon Fiber Reinforced Polymer) structure, the common practice is to remove the damaged area material and form a predetermined repair geometric configuration using the grinding method according to the repair design shape. The geometric accuracy, dimensional accuracy, and surface characteristics of the geometric configuration have a significant
-
Assembly tapered fiber Bragg grating tip with gold nanostars for heat generation and gradient temperature sensing Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Qiaochu Yang, Deming Hu, Zesen Li, Zhiyuan Xu, Yang Ran, Bai-ou Guan
Optical fiber-based photothermal devices show great promise for applications in in vivo detection and therapy. The integration of sensors and actuators in one fiber is a feasible method to orchestrate both functionalities. However, the photoheating-induced temperature field is not always homogeneous in the practical application, which undermines the accuracy of temperature monitoring using a single
-
High-brightness fiber-coupled source of polarization-entangled photon pairs spanning the telecom C- and L-bands Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Vikash Kumar Yadav, Vivek Venkataraman, Joyee Ghosh
We report a compact, flexible, and efficient fiber-integrated broadband source of polarization-entangled photon pairs at telecommunication wavelengths spanning the C- and L-bands. Type-0 spontaneous parametric down-conversion (SPDC) in a 4-cm long fiber-pigtailed Zn-indiffused MgO-doped periodically-poled lithium-niobate (PPLN) ridge waveguide is employed in the Sagnac configuration. The source generates
-
Hybrid structured fiber-optic Fabry–Pérot interferometer for simultaneous bicarbonate and temperature measurements Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Wenyu Wang, Shaoxiang Duan, Lingyi Xiong, Bo Liu, Yuan Yao, Wei Lin, Hao Zhang, Haifeng Liu, Jixuan Wu
We present a temperature-compensated Fabry-Pérot interferometer (FPI) fiber-optic bicarbonate concentration sensor based on the Vernier effect. The proposed sensor is fabricated by splicing a section of single-mode fiber (SMF) at the misalignment of the lead-in SMF so that the core of the lead-in SMF is completely exposed, and then splicing a section of multimode fiber (MMF) to align it with the lead-in
-
Powder stream performance of a novel annular laser direct metal deposition with inside-laser coaxial powder feeding nozzle: Simulation and experimental perspectives Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Kaixin Wang, Yonggang Tong, Yongxiong Chen, Lingchao Kong, Kaiju Lu, Jie Wang, Xiubing Liang
Powder stream performance significantly influences the powder utilization rate of laser direct metal deposition (LDMD), while its divergence and variability make it difficult to understand and optimize. Herein, we used a computational fluid dynamics (CFD) model to simulate the powder stream performance of a novel inside-laser coaxial two-airflow powder feeding system. It was found that reducing the
-
Hybrid-core co-planar waveguide mode multiplexer fabricated by multi-step photolithography for high-order-mode-passed guide mode manipulating Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Quandong Huang, Jiaqi Ran, Kedi Peng, Jiafeng He, Qingming Chen, Xinyu Zhou
We propose a methodology for fabricating a hybrid-core planar waveguide mode multiplexer using multi-step photolithography and demonstrate the manipulation of the fundamental mode without affecting the high-order modes in the experiment. We design and fabricate the proposed mode multiplexer, and our experimental device provides coupling ratios for the fundamental mode that are higher than 92.0 % and
-
A novel methodology for investigating the through-thickness molten pool shape during remote laser beam welding Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Venkat Vivek Pamarthi, Tianzhu Sun, Abhishek Das, Pasquale Franciosa
Molten pool shape can retrieve information on thermal gradients and solidification rates which provide substantial process signatures on cracking and weld quality. However, monitoring the molten pool shape remains a challenging task due to the complex nature of the laser welding process. The current study employs a novel monitoring methodology to examine the role of through-thickness molten pool shape
-
Near-Infrared double active medium coupled bottle-like microcavity laser through Forster resonance energy transfer effect for optical biosensing Opt. Laser Technol. (IF 5.0) Pub Date : 2024-03-01 Min Ji, Chunfeng Li, Shuliang Zhang, Yangfeng Sun
Long wavelengths (>650 nm) hold great promise for bio-photonics applications. This study details the fabrication and characterization of a near-infrared single-mode coupled double-active medium whispering gallery mode (WGM) bottle-like microcavity laser through the use of the Vernier effect. We also utilized cascade hetro energy transfer using a Forster resonance energy transfer (hetro-FRET) from a
-
Synthesis and characterization of Mn–Zn ferrite-based flexible penta-band metamaterial for sensing applications Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-29 Md. Zikrul Bari Chowdhury, Mohammad Tariqul Islam, Abdulrahman Alqahtani, Ahmed S. Alshammari, Mohamed S. Soliman, Saeed Alamri, Md. Samsuzzaman
This article presents the synthesis and characterization of a Mn–Zn ferrite based flexible penta-band metamaterial optimized for modern wireless and permittivity sensing applications, particularly emphasizing ceramic damage detection. The flexible substrate was prepared utilizing the sol–gel synthesis method for the design, where a SRR metamaterial unit cell was precisely designed and fabricated on
-
Temperature field analysis and process parameter optimization during L-PBF of Al-Mg-Sc-Zr alloy Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-29 YANG Qin-wen, YI Chuan-ming, XIAO Gang
To improve the relative density and decrease the manufacturing deficiency, a 3D finite element model of multi-layer and multi-track, considering material state transition and temperature-dependent and anisotropic thermal properties, was established and validated to study the temperature field and optimize the process parameters of laser powder bed fusion. The effects of process parameters on cooling
-
Ultra-high-resolution phase demodulation based miniature fiber-optic accelerometer at low and medium frequencies Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-29 Jiayu Huang, Yajie Zhang, Min Guo, Guangyin Zhang, Xinyu Zhao, Chenxi Li, Ke Chen
A miniature fiber-optic Fabry–Perot (F-P) accelerometer based on phase demodulation is demonstrated for improving sensitivity. The accelerometer is composed of a 11.5 mm diameter cylindrical outer frame, a spring-like diaphragm with a loaded mass block and optical fiber. This structure is not only simple and easy to manufacture, but also greatly improves the performances of the accelerometer. The F-P
-
Wavelength continuously tunable and wavelength spacing variable comb filter based on a High-Birefringence fiber loop mirror Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-28 Xiaofang Xu, Anum Khattak, Li Wei
We demonstrated an all-fiber comb filter that can continuously tune the wavelength for four switchable wavelength spacings. The comb filter consists of a fiber loop mirror (FLM) that is inserted with three polarization maintaining fibers (PMFs) and three polarization controllers (PCs). The transmission characteristics of the comb filter was theoretically analyzed. The wavelength continuously tunable
-
A polarization sensitive self-excited multi-wavelength Brillouin-Erbium fiber laser without filtering devices Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-28 Hui Zou, Yang Shi
A self-seeded multi-wavelength Brillouin-erbium fiber laser (BEFL) with high Optical Signal To Noise Ratio (OSNR) is demonstrated in the combination of the local line-cavity and the overall ring-cavity system. Especially, the BEFL is composed of one 13 m-Erbium-doped fiber (EDF) laser, a 1-km-long single-mode fiber (SMF) merely, where is no filter included. The self-seeded signal in BEFL is initiated
-
Ring laser bending vector sensor based on super-mode interference in a seven-core fiber Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-28 G. Salceda-Delgado, J.E. Antonio-Lopez, R. Amezcua-Correa, J.R. Alonso-Cruz, A.L. Martinez-De-Leon, A.K. Roque-Mata
A bending vector sensor based on a ring laser and super-mode interference in a seven-core fiber (SCF) is presented. The super-mode interference is originated via a Mach–Zehnder interferometer constructed with an SCF spliced between two single-mode fibers. The interference modulates the cavity laser losses of an erbium-doped ring cavity laser. As the interferometer structure is bent, the interference
-
Anisotropic perfect absorber at mid-infrared wavelengths using black phosphorus-based metasurfaces Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-28 Zhihao Yuan, Yanlei Liu, Xueyang Zong, Zhiying Chen, Yufang Liu
Black phosphorus (BP) is a promising two-dimensional (2D) material with direct band gap and distinctive lattice structure. Control over its bandgap can be achieved through physical or chemical methods, enabling selective light absorption within specific wavelength ranges. This study designed a narrow-bandwidth perfect absorber with highly quality () factor, anisotropy and flexible tunability based
-
Design of enlarged-asymmetric-power single-mode silicon evanescent lasers with asymmetric distributed feedback gratings Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-28 Qing Ge, Jun Wang, Shuaicheng Liu, Feng Lin, Hao Zhai, Chuanjiang Liu, Yanan Chen, Yiming Bai, Hao Liu, Shiwei Cai, Yongqing Huang, Xiaomin Ren
Great achievements in the bonded III–V lasers have pushed the productization process of silicon photonic chips. In this work, we report the design of silicon evanescent lasers with asymmetric gratings, which can provide high output power and stable single-longitudinal-mode operation. The high coupling efficiency and low threshold current density are achieved by linearly expanding the width of rib waveguide
-
A dual-wavelength erbium-doped fiber laser for high resolution strain sensing with compound filter of a Sagnac loop and a long period fiber grating Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Lida Li, Hailiang Chen, Ruyue Shi, Hongwei Li
A dual-wavelength erbium-doped fiber laser (EDFL) strain sensing system composed of compound filter of a long period fiber grating (LPFG) and a Sagnac loop is proposed. Polarization maintaining fiber (PMF) in Sagnac loop acts both an interference filter and a strain sensing probe with high sensitivity, low cost, and low loss. LPFG is used to modulate the transmission wavelength and bandwidth of EDFL
-
Propagation of ideal discrete “frozen wave”-type light-sheets in lossless stratified media Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Jhonas O. de Sarro, Leonardo A. Ambrosio
Based on the original concept of optical frozen waves—one-dimensional structured threads of light constructed from Bessel beams—an approach to construct longitudinally structured light sheets inside the last layer of a lossless stratified structure is analytically presented. The resulting bi-dimensional beam is able to be structured after suffering multiple transmissions and reflections. A procedure
-
Research on gas pore formation and inhibition mechanism of high nitrogen steel during laser direct metal deposition Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Kun Yang, Mingzhi Chen, Kai Zhao, Zhiyuan Jia, Zhandong Wang, Huan Qi, Guifang Sun
Nitrogen pore formation is an inherently tricky problem that limits the application of high nitrogen steel (HNS) in various fields. In the present study, a CA-LBM coupling model was proposed to understand the nitrogen pore formation mechanism during laser direct metal deposition (DMD) of HNS. Based on the proposed model and theoretical analysis, the effects of pulse frequency and shielding gas nitrogen
-
Recent advance on fiber optic SPR/LSPR-based ultra-sensitive biosensors using novel structures and emerging signal amplification strategies Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Siqin Zhou, Jiulong Li, Qiuyang Zhang, Yi Tong, Xuan Qi, Yixiang Duan, Xudong Zhang, Zewei Luo, Yongxin Li
Biomarkers with ultralow concentration in the actual samples play a vital role in the clinical disease diagnosis, infectious disease screening, food security, and environmental monitoring. Fiber optic (FO)-based surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) biosensors attract immense attention for , and rapid detection due to their merits of miniaturized devices, easy
-
Influences of Si-Ti combined alloying on microstructures and properties of laser welded socket joints of molybdenum Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Linjie Zhang, Han Yu, Xueliang Zeng, Guang Sun, Xiangdong Ding, Yuanjun Sun
This study selected silicon (Si) and titanium (Ti) as alloying elements to explore influences of the Si:Ti mass ratio on performance of molybdenum bead on plate laser welded joints. When the Si:Ti ratio was 1:1, the silicides exhibited a uniform continuous distribution, and significantly increased room temperature tensile strength of molybdenum bead on plate from 48 MPa to 231.6 MPa. In addition, Si-Ti
-
Research on key technology to determine the exact maximum allowable current-carrying ampacity for submarine cables Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-27 Bernard Marie Tabi Fouda, Dezhi Han, Wenjun Zhang, Bowen An
The maximum allowable current-carrying ampacity (MACCA) of a photoelectric composite submarine cable in its design phase is usually patterned considering the weather. However, variations in sea temperature, the uncertainty of the cable's material parameters and the laying environment of the cable greatly influence its CCA. The impact of these factors can damage the cable, regardless of its quality
-
Diffraction characterization of non-zero radial index optical vortices using gradually changing-period annular radial gratings combined with phase diagrams Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-26 Xizheng Ke, Yanchen Xie
The utilization of the radial index of a vortex beam for information transmission has significant potential for enhancing the communication system capacity and communication rates. In this study, we propose a simple and efficient approach to characterize nonzero radial-index vortex beams using a gradually changing-period annular radial grating, which enables improved detection accuracy by shaping the
-
Inter-plane crosstalk suppression for single-shot 3D reconstruction of interferenceless coded aperture correlation holography via Wiener deconvolution/TV-K constraint Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-26 Junpeng Yang, Le Yang, Tao Huang, YuHeng Wang, Weina Zhang, Jianglei Di, Joseph Rosen, Liyun Zhong, Yuwen Qin
Interferenceless coded aperture correlation holography (I-COACH), which utilizes spatial incoherent light illumination to achieve interferenceless and non-scanning three-dimensional (3D) imaging, has revolutionized the field of incoherent holography. However, existing correlation reconstruction algorithms often suffer from significant inter-plane crosstalk from multiple cross-sections of the sample
-
Noise resistance characteristics of wavefront shaping techniques Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-26 Wenkang Li, Wenjing He, Yixin Dai, Haoyi Zuo, Lin Pang
Both enhancement and convergence speed are the most important metrics for wavefront shaping techniques on focusing light through scattering media, while the noise inherent in the experimental system always deviates the designed wavefront from the optimum. Recently, many techniques have been applied to overcome light scattering, such as element evaluation methods, populational pattern-based optimization
-
Digit classification of ghost imaging based on similarity measures Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-26 Ying Li, Jialin Zhang, Dan Zhao, Yue Li, Sheng Yuan, Dingfu Zhou, Xin Zhou
In this paper, a pattern recognition scheme based on ghost imaging (GI) system is proposed, which is inspired by the fact that the one-dimensional vectors obtained by the GI system can be considered as an alternative representation of the original object, and these vectors will be able to greatly preserve the original object features when appropriate illumination patterns are adopted. The characteristics
-
Simulation and experimental validation of the JCR-CNN model for hybrid modes recognition and decomposition in few-mode fibers Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-26 Baorui Yan, Jianyong Zhang, Shuchao Mi, Guofang Fan, Chenyu Wang, Muguang Wang, Fengping Yan
The issue of mode decomposition (MD) in optical fibers is regarded as a regression problem has been widely studied and applied, however, in contrast, the identification of different classes of hybrid modes groups when different modes are excited as a typical classification problem has rarely been studied, and the possibility of incorporating both tasks into a single neural network to be solved simultaneously
-
Bidirectional Littrow double grating interferometry for quadruple optical interpolation Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-24 Wenyuan Zhou, Zhaowu Liu, Yujia Sun, Hairui Teng, Weichen Wang, Wenhao Li
Although grating interferometers are considered high-performance optical displacement sensors, higher requirements are being demanded for displacement sensing. Furthermore, the TGIS (traditional grating interferometry system) cannot achieve high-fold optical subdivision in the case of single-diffraction, which restricts the improvement of measurement resolution. In this paper, a BLDGIS (bidirectional
-
The effects of synthesis route and LaB6-doping on FeCoNiCrTi coating performance: Morphology, microstructure, microhardness and corrosion resistance Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-23 Dadong Jie, Meiping Wu, Rui He, Chen Cui, Yuling Gong, Xiaojin Miao
In this work, the FeCoNiCrTi HEA coatings were fabricated on the Ti6Al4V surface via laser cladding technology. The effects of synthesis routes (different energy density, ) and LaB-doping on the single-track morphology, phase distribution, microstructure, microhardness and corrosion resistance of HEA coatings were comprehensively studied. Interestingly, the regulation of and addition of LaB significantly
-
Multi-spot ultrafast laser ablation at ambient pressure – A new window on coalescing shock wave interactions Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-23 Tong Zhou, Sebastian Kraft, Zheng Fang, Walter Perrie, Matthew Bilton, Jörg Schille, Udo Löschner, Sam E Rigby, Stuart Edwardson, Geoff Dearden
During ultrafast laser ablation at ambient pressure, redeposition of nano-particulates occurs through backwards flux towards the end of the ablation process and is often viewed as undesirable. Here, on the contrary, we report on unique, highly symmetric redeposition patterns observed during ultrafast laser ablation of metals with closely spaced multi-spots in ambient gases. Spot symmetries were altered
-
Effect of laser shock peening uniformity on bending fatigue life of 20CrNiMo Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-23 Xiuyu Chen, Kelin Li, Yuru Lin, Zhilong Xu, Bicheng Guo, Junying Chen, Qingshan Jiang, Zhenye Zhao
In order to improve the effect of laser shock peening, the factors affecting the uniformity of laser shock peening and its influence on the bending fatigue life of specimens were investigated by combining experiment and simulation. The results show: overlap rate, energy, laser pulse time and spot diameter are the influencing factors of laser shock peening, among which overlap rate is the most important
-
Tailored absorption/emission and ultrastrong coupling from heavily doped germanium plasmonic antennas Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-23 Haining Chong, Yuanhao Mu, Yangjian Cai, Hui Ye
We evaluate the performance of heavily doped germanium (Ge) on silicon as a mid-infrared plasmonic material using experimental data and benchmark it against noble metals such as Au. Thanks to the strong confinement provided by the high refractive index of the spacer layer (undoped Ge) in our material system, along with the tunable plasma frequency and low scattering rate of heavily doped Ge, we demonstrate
-
High-resolution single-pixel imaging based on a probe of single-mode fiber and hybrid multimode fiber Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-23 Ronghua Fan, Lijing Li, Yue Zheng
In single-pixel imaging, the combination of random speckles generated by the multimode fiber (MMF) as projection patterns and the compressed sensing theory is beneficial for improving imaging performance and expanding application scenarios. However, the image reconstruction quality using the MMF is usually unsatisfactory, which is helpless for retrieving objects with detailed information or multi-resolution
-
A multifunctional optical computing system based on directed logic and micro-ring resonator Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-22 Yuhong Xia, Shenghang Zhou, Feng Chen, Xing Yu, Jia Liu, Fuhua Li, Xiubao Sui
Photonic integrated circuits are suffering rapid development and attracting lots of interests in various application fields, however, obstacles like low integration of photonics components and single functionality are severely hindering the progress. In this paper, we proposed a compact on-chip optical computing system, based on directed logic and micro-ring resonators (MRRs), achieving multiple functionalities
-
High-efficiency 6-hole structure anti-resonant hollow-core fiber 2.79 μm Cr,Er:YSGG high-energy pulse laser transmission system Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-22 Lei Huang, Yinze Wang, Yueyun Zhang, Tingqing Cheng, Li Wang, Haihe Jiang
Using anti-resonant hollow-core fibers instead of light guide arms for laser energy transmission can greatly improve the flexibility of medical laser devices, reduce system complexity, and increase laser transmission efficiency. In this paper, a 6-hole anti-resonant air-core fiber (AR-HCF) with a length of 1.5 m and a core diameter of 78 μm is designed to transmit the radiation at 2.79 μm waveband
-
Identification of a replicable optical security element using laser speckle Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-21 A.M. Smolovich, A.V. Frolov, L.D. Klebanov, I.D. Laktaev, A.P. Orlov, P.A. Smolovich, O.V. Butov
An optical security element containing an area of random rough relief is proposed. It combines the low cost of mass replication inherent in traditional security holograms with the impossibility of holographic copying, when the wave restored by the hologram is rewritten as a copy of this hologram. The proposed optical element is also protected from contact and photographic copying. Laboratory samples
-
Research on the synchronization of a controllable memristive photosensitive FitHugh-Nagumo model Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Shu Zhou, Guodong Huang, Rui Zhu, Yunhai Wang, Yuan Chai
Memristors are electronic devices with non-volatility, adjustability, and variability that enhance the learning and adaptability of neural networks. A model of a photosensitive FitHugh-Nagumo (FHN) neuron capable of mimicking the discharge mechanism of photosensitive neurons has recently been proposed. This article presents a controlled memristive photosensitive FitHugh-Nagumo (CMP-FHN) model based
-
Experimental study on nanosecond laser thermal decomposition of CFRP and recycling of carbon fibers Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Yunxia Ye, Zhao Yuan, Zijing Zhang, Guanglei Chen, Guangao Pei, Fei Guo, Xudong Ren
The recycling of Carbon Fiber Reinforced Plastic (CFRP) waste has become an inevitable trend with the development of science and industry today. A method for recycling carbon fiber is presented in this article. An infrared laser was used to gasify CFRP surface resin and then surface carbon fibers can be recycled. The recycling process parameter window and the influence law of laser parameters on the
-
Analysis of photodiode signals for monitoring the laser beam welding process of cell-internal contacts in lithium-ion batteries Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Sophie Grabmann, Felix Harst, Christian Bernauer, Tony Weiss, Michael F. Zaeh
A major challenge in producing lithium-ion battery cells is establishing reliable and stable manufacturing processes. Cell-internal contacting is one step in the battery cell production chain in which the uncoated sections of the current collector foils of the individual electrodes in the cell stack are electrically connected by a joining process. Laser-welding technologies open up new possibilities
-
Er-doped fiber lasers with all-fiber dispersion management based on Cr2Sn2Te6 saturable absorbers Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Shuaimeng Li, Xiaoyu Zhao, Yutian He, Lezheng Wang, Weiyu Fan, Xinlei Gao, Guomei Wang, Wenfei Zhang, Shenggui Fu, Cheng Lu, Huanian Zhang, Wei Qu
Recently, new low-dimensional materials have been widely used in the field of optoelectronics. These low-dimensional materials bring further improvement to the performance of fiber lasers. In this experiment, a CrSnTe saturable absorber (SA) with modulation depth of 6.17% and saturable intensity of 15.97 MW/cm was prepared and its nonlinear absorption characteristics in erbium-doped fiber laser were
-
Spatially distributed PT symmetric refractive index using four-wave-mixing in a double-Λ setup Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Viačeslav Kudriašov, Wen-Te Liao, Gediminas Juzeliūnas, Hamid R. Hamedi
We propose a scheme for designing Parity-Time () spatially symmetric structures of the refractive index for a generated probe field propagating in a double- (DL) atomic medium. By creating position-dependent atomic coherences and manipulating them controllably—via applied control fields and one-photon detuning— we achieve symmetry of the refractive index. This causes the refractive index components
-
Strong circular dichroism with high quality factor enabled by hyperbolic material α-MoO3 in mid-infrared range Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Didi Song, Biyuan Wu, Yufang Liu, Xiaohu Wu, Kun Yu
As an emerging natural biaxial hyperbolic material, α-phase molybdenum trioxide (α-MoO) exhibits the excellent anisotropy and unique electromagnetic manipulation properties, which further stimulates the potential for polarization manipulation. Here, a Fabry-Perot cavity chiral structure based on multilayer films of α-MoO and BaF is presented, which exhibits excellent circular dichroism (CD) by displaying
-
Edge-weak-coupling femtosecond laser line-by-line inscription technique for fabricating apodized FBG Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Jianhui Su, Pinggang Jia, Guowen An, Haiyang Wang, Jingyi Wang, Haoquan Wang, Li Qin, Jijun Xiong
The apodization profiles have a great influence on the performance of apodized fiber Bragg gratings (AFBGs). Different apodization profiles can significantly affect the side lobe suppression ratio (SLSR) of AFBGs. In this work, we demonstrate theoretically and experimentally that the reduction of the local coupling strength of Gaussian AFBG edges can promote the side lobe suppression of the AFBG. Compared
-
Polarization-sensitive metamaterial absorber based on the composite grating structure in the long-wave infrared band Opt. Laser Technol. (IF 5.0) Pub Date : 2024-02-20 Enzhu Hou, Zhongzhu Liang, Xiaoyan Shi, Fuming Yang, Xiqing Zhang, Rui Dai, Shoutao Zhang, Weizhen Liu, Yan Jia
Infrared absorbers exhibiting polarization-sensitive performance are in great demand in numerous applications, including imaging, sensing, and detection. Here, A novel polarization-sensitive absorber (PSA) based on the composite grating structure is proposed in the long-wave infrared band (LWIR). Based on gap resonance, localized surface plasmon (LSP), and Fabry–Pérot (F-P) resonance modes, the proposed