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2024 advanced Fiber Laser Conference, AFL 2024

作者： Yang, Ying Ma, Shuanglong Chen, Zifeng Luo, Xing Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Period doubling bifurcation (PDB) phenomenon, which is prevalent in nonlinear systems, has attracted considerable attention because of its potential application value. As an ideal platform for studying the pulse dynamics of nonlinear systems, the mode-locked fiber laser has been intensively investigated in the near-infrared (NIR) spectral region. However, there is a paucity of relevant reports of pulse dynamics in the mid-infrared (MIR) spectral region. Especially for the MIR large-mode-area (LMA) fluoride fiber oscillator, the existence of multiple transverse modes and a new spatial degree of freedom makes the pulse dynamics phenomenon is more complex, which needs to be further explored. In this paper, a soliton regime with a pulse duration of 404.5 fs, repetition frequency of 45.02 MHz, and average output power of 105.3 mW is obtained in a few-mode fluoride fiber oscillator mode-locked by the nonlinear polarization rotation (NPR) technique. By merely increasing the power of the pump, a period doubled soliton with the pulse intensity varying between two different values can be obtained. This work facilitates a more profound comprehension of the nonlinear dynamics in the mid-infrared multimode fluoride fiber laser, and opens up new opportunities for the chaos, optical frequency combs and all-optical modulation. © 2025 SPIE.

关键词： Infrared devices

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Research on Fatigue Detection and Remaining Life Prediction of High-Strength Steel Based on Nonlinear Guided Waves

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Journal of Materials Engineering and Performance 2025年 1-7页

作者： Quan, Silong Zhang, Yuhua School of Mechanical and Electronic Engineering East China University of Technology Nanchang China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guangxi University Nanning China

In the realm of automotive lightweight design, high-strength steel offers the dual benefits of cost efficiency and social welfare by enabling weight reduction without incurring additional expenses. However, high-strength steel plates are prone to fatigue damage after being subjected to repeated loads, which poses a significant risk to the stability and longevity of vehicle performance. As a result, the health monitoring and life assessment of high-strength steel components are particularly crucial. This research leverages nonlinear ultrasonic guided wave technology to conduct both online and offline experiments on Q460 high-strength steel, delving into the correlation between nonlinear ultrasonic parameters and the fatigue life of the material. The experiments indicate that nonlinear ultrasonic parameters initially rise and then fall as the fatigue life increases, reaching a peak when the fatigue life is at 60%. Moreover, based on the relationship model between nonlinear ultrasonic parameters and fatigue life, a preliminary method for assessing the fatigue remaining life has been established. This method utilizes the material's nonlinear ultrasonic parameters to predict its remaining fatigue life. The insights gained from this study provide a viable technical solution for the damage assessment and life prediction of Q460 high-strength steel.

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Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network

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Science China(Physics,Mechanics & Astronomy) 2025年第06期Mechanics & Astronomy) .卷 158-167页

作者： Junmin Liu Jiafu Chen Qingji Zeng Zemin Liang Xinping Wu Xin Zhao Jiangnan Xiao Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen University College of New Materials and New Energies Shenzhen Technology University Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical System Terahertz Science Cooperative Innovation Center School of Optical-Electrical Computer Engineering University of Shanghai for Science and Technology Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University School of Information and Electronics Beijing Institute of Technology

Orbital angular momentum(OAM) modes provide an additional orthogonal physical dimension, offering transformative potential for enhancing optical communication capacity. Despite significant progress in mode multiplexing, the development of robust communication networks faces persistent challenges, particularly in effectively routing and controlling these multiplexed channels among network nodes. To tackle these dilemmas, we propose a rotatable diffractive neural network(R-DNN) strategy and demonstrate its capability for port-controllable OAM mode routing. By leveraging the correlation between the orthogonal evolution of OAM modes in free space and phase modulations during propagation, the R-DNN precisely shapes the spatial evolution of mode fields through multiple rotatable phase layers, enabling efficient routing to specific output ports. This approach exploits the interaction of secondary wavelets with the relative states of the rotatable layers, allowing on-demand control of mode evolution paths and enhancing routing flexibility. As a proof of concept, we developed a tri-functional router that successfully directs three OAM modes to individually controllable output ports. This router achieves an average intermode crosstalk of less than-16.4 dB across three functional states, one-dimensional, two-dimensional, and cross-connected switching, while supporting the routing of 5.85 Tbit/s quadrature phase-shift keying signals. These results highlight the R-DNN's effectiveness in achieving precise and controllable OAM mode manipulation, paving the way for advanced applications in mode-multiplexed communication networks and beyond.

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Polarization maintaining all-fiber 2-μm pulse seeded by the soliton self-frequency shift of 1.5-μm pulse

Polarization maintaining all-fiber 2-μm pulse seeded by the...

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2024 advanced Fiber Laser Conference, AFL 2024

作者： Yu, Qichun Luo, Xing Wang, Jiachen Lu, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

This study used erbium-doped fiber laser to pump highly nonlinear fibers to generate soliton self-frequency shift (SSFS), and implemented a full fiber polarization maintaining 2 μm master oscillator power amplifier (MOPA) system based on a 1.5 μm pulse laser frequency shift. By using saturable absorber (SA) mode-locked pulses as seed sources, a traditional soliton with a center wavelength of 1560-nm, and a repetition rate of 67-MHz was obtained. After two-stage amplification, the seed pulse can output a maximum average power of 982mW. After two stages of amplification, it can output a maximum average power of 982mW. Cascade a segment of polarization maintaining high nonlinear fiber (PM-HNLF) after the amplification stage, the amplified optical pulse generates soliton self-frequency shift in the PM-HNLF. In this work, a small core PM1550 fiber is used as the high nonlinear fiber, which can ultimately be frequency shifted to 2060nm, with a signal-to-noise ratio of (SNR) 73.32dB. The system is entirely constructed with polarization maintaining fibers, without any free space optical components, with strong anti-interference ability, good stability, and high integration. © 2025 SPIE.

关键词： Saturable absorbers

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Black phosphorus mode-locked Er:ZBLAN fiber laser at 3.5 µm

Black phosphorus mode-locked Er:ZBLAN fiber laser at 3.5 µm

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2024 advanced Fiber Laser Conference, AFL 2024

作者： Li, Zhuobiao Li, keyi Wang, Jiachen Xing, Luo Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

In this paper, we demonstrate a all-fiber 3.5 μm mode-locked fiber laser based on Black phosphorus. The fiber laser delivered pulses with a central wavelength of 3468.4 nm, 3 dB spectral bandwidth of 2.1 nm, pulse repetition rate of 16.85 MHz, average output power of 46 mW, and signal-to-noise ratio of 65 dB. Due to the relative low output power and the low sensitivity of detectors in 3.5 μm regime, the pulse width had not hitherto been acquired using a commercial autocorrelation. The Fourier transform limit pulse width estimated by the hyperbolic secant curve is 8.4 ps. This work opens up new ideas for generating all-fiber mode-locking mid-infrared laser. © 2025 SPIE.

关键词： Mode-locked fiber lasers

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All-polarization-maintaining multi-pulse thulium-doped fiber laser based on nonlinear polarization rotation

All-polarization-maintaining multi-pulse thulium-doped fiber...

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2024 advanced Fiber Laser Conference, AFL 2024

作者： Wang, Tao Li, Zhuobiao Wang, Jiachen Xing, Luo Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Soliton molecule multi-pulse output was achieved based on an all-polarization-maintaining thulium-doped fiber, with a central wavelength of 1970.6 nm, a pulse repetition frequency of 12.39 MHz, and an average output power of 8 mW. Due to the low pulse output power obtained, it was impossible to measure the pulse width using a commercial autocorrelator, and the oscilloscope could not resolve pulse intervals below 50 ps, thus the symmetric waveform of the soliton molecule was not observed. As the pump power varied, the laser could switch between soliton cluster pulse and noise-like pulse outputs. The laser structure consisted of an all-polarization-maintaining ring cavity pumped by a 793 nm laser. © 2025 SPIE.

关键词： Mode-locked fiber lasers

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3μm watt level Dy: ZBLAN All-fiber high power lasers

3μm watt level Dy: ZBLAN All-fiber high power lasers

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2024 advanced Fiber Laser Conference, AFL 2024

作者： Zhang, Chun Li, Dianjia Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

The mid-infrared band fiber lasers are very important for fundamental research and industrial applications. Mid-infrared fiber lasers in the 2 - 3.5 μm spectral region have been widely used in many fields, including gas remote sensing, molecular detection, material processing, and biomedicine. In this letter, by splicing the fluoride fiber and the quartz fiber, the 976 nm pump light was fused to a 6 m, 7 mol.%, Er3+:ZBLAN fiber system. With the fluoride fiber grating as the resonator, a 11.7 W continuous light output at 2.8 µm was achieved, realizing a high-power, all-fiber 2.8 µm laser. The laser center wavelength was 2826.6 nm, the maximum slope efficiency was 21.7%, and the beam quality M2 3+: ZBLAN fiber. Using the high-power 2.8 µm all-fiber laser as the pump source, it was fused to a 2.7 m, 0.2 mol.%, Dy3+:ZBLAN fiber system through a single-mode ZBLAN fiber. Two self-inscribed fiber Bragg gratings (FBGs) with reflectivities of 99.68% and 30.5% respectively were used to construct an all-fiber Fabry-Perot laser cavity. A 3.8 W continuous light output at 3.2 µm was achieved under a pump power of 7.7 W, realizing a high-power, all-fiber 3.2 µm laser. The laser center wavelength was 3198.97 nm, the measured slope efficiency was 53.0%, the maximum optical-to-optical efficiency was 49.4%, and the beam quality M2 © 2025 SPIE.

关键词： Fiber lasers

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Finite-Time Consensus of Second-Order Multiagent systems With Input Saturation via Hybrid Sliding-Mode Control

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IEEE Transactions on Automation Science and Engineering 2025年 22卷 14623-14632页

作者： Jiang, Xiaowei Jiao, Ranran Li, Bo Zhang, Xianhe Yan, Huaicheng China University of Geosciences School of Automation Wuhan430079 China Ministry of Education Hubei Key Laboratory of Advanced Control and Intelligent Automation of Complex Systems Engineering Research Center of Intelligent Geodetection Technology Wuhan430074 China Ministry of Education Key Laboratory of System Control and Information Processing Shanghai200240 China Anhui University of Finance and Economics School of Finance Bengbu233030 China Hubei Normal University School of Electrical Engineering and Automation Huangshi435002 China Ministry of Education East China University of Science and Technology Key Laboratory of Smart Manufacturing in Energy Chemical Process Shanghai200237 China

This paper addresses the finite-time consensus (FTC) issue for second-order multi-agent systems (MASs) with nonlinear disturbances. To tackle the challenges posed by increasingly complex communication environments, an innovative integral sliding-mode surface is designed using event-triggered control. Furthermore, the study explores communication constraints between the leader and followers, employing impulsive control to facilitate communication only at specific intervals. A novel hybrid integral sliding-mode control protocol is advanced for the second-order MASs, which effectively eliminates the "Zeno phenomenon" and notably reduces both communication frequency and energy consumption, thereby enhancing overall communication efficiency. Ultimately, the efficacy of the put forward protocol is verified through simulation examples including comparison experiment. © 2004-2012 IEEE.

关键词： Protocols Sliding mode control Event detection Multi-agent systems Costs Training Topology Switches Sufficient conditions Stability analysis

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Kilowatt level high-power thulium doped fiber laser

Kilowatt level high-power thulium doped fiber laser

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2024 advanced Fiber Laser Conference, AFL 2024

作者： Zhang, Xiao Dong, Fanlong Yan, Peiguang Wang, Jinzhang Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

In this paper, a high power Tm3+-doped fiber laser (TDFL) based on a monolithic master oscillator power amplifier (MOPA) system with the center wavelength is 1940 nm is *** maximum laser power was measured to be 909 W with a slope efficiency of 50.1% at the 793 nm pump power of 1816 W. Power stability of the laser output over 60 min is measured to be ~0.14% .Output power is pump-limited without the onset of parasitic oscillation or amplified spontaneous emission (ASE) even at the maximum power, showing further power scaling should be possible with increase the pump power. © 2025 SPIE.

关键词： optical pumping

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Theoretical and experimental study of amorphization and lattice transformation of pure magnesium by ultra-precision cutting method

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Journal of Magnesium and Alloys 2025年

作者： He, Chunlei Wang, Shuqi Xia, Siyu Ren, Chengzu Tianjin Key Laboratory of Equipment Design and Manufacturing Technology Tianjin University Tianjin300354 China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin300384 China

Pure magnesium is a very promising material in the fields of biomedical and engineering. Obtaining pure magnesium with superior mechanical properties has consistently been a significant challenge in the area of materials science. This study focuses on investigating the processing method and strengthening mechanism of pure magnesium by ultra-precision cutting. The research results show that the pure magnesium grains were significantly refined after ultra-precision cutting. The average grain size reduced from ∼24 µm to nanometers, and the average nano-hardness increased from 1.02 GPa to 2.82 GPa. Amorphous pure magnesium structure and body-centered cubic (BCC) lattice pure magnesium were reported. Molecular dynamics (MD) simulation confirmed that the high shear strain and hydrostatic pressure during ultra-precision cutting was the origin of amorphization and lattice transformation. The amorphous phase and a significant number of long-period stacking-ordered (LPSO) phases inside the pure magnesium were responsible for the high hardness after ultra-precision cutting. © 2025

关键词： Shear strain

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