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学者姓名：王智勇
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Abstract ：
Pseudo-Random Binary Sequence (PRBS) phase modulation is an effective method for suppressing the stimulated Brillouin scattering (SBS) effect generated by narrow-linewidth fiber lasers during amplification. We noticed that backward time-domain pulses were generated when using PRBS modulation signals in fiber amplification. In this paper, the time-domain dynamic characteristics of the forward output laser and the backward Stokes light after PRBS phase modulation were studied theoretically. Through analyzing the transient SBS three-wave coupling theory and combining it with the SBS accumulation time constant, we knew that the forward and backward high-intensity pulses were caused by the long dwell time of the PRBS. For this purpose, we provided a new method for suppressing high-intensity pulses caused by a long dwell time; namely, we modified the maximum length sequence (MLS) of PRBS signals to eliminate the long dwell time, took the PRBS-9 signal at 1 GHz as an example, and then used MLS1 modulation and MLS2 modulation to compare them with unoptimized PRBS modulation. The output laser peaks of the MLS1 and MLS2 signals were reduced from +/- 55% to +/- 25% and +/- 10% relative to the original PRBSs, respectively, and the peaks of Stokes light were reduced from 39% to 19% and 11%, respectively. Additionally, we experimentally verified that the rational optimization of the sequence did not reduce the SBS threshold. The results provided a new method for suppressing high-intensity pulses during the amplification of a PRBS phase-modulated laser, which played an important role in the output stability of high-power narrow-linewidth fiber amplifiers.
Keyword ：
PRBS PRBS MLS MLS phase modulation phase modulation narrow linewidth narrow linewidth SBS SBS
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| GB/T 7714 | Zhu, Yun , Li, Ying , Li, Dong et al. A Theoretical and Experimental Analysis of the Time-Domain Characteristics of a PRBS Phase-Modulated Laser System [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (20) . |
| MLA | Zhu, Yun et al. "A Theoretical and Experimental Analysis of the Time-Domain Characteristics of a PRBS Phase-Modulated Laser System" . | APPLIED SCIENCES-BASEL 14 . 20 (2024) . |
| APA | Zhu, Yun , Li, Ying , Li, Dong , Dong, Lin , Liu, Xuesheng , Yan, Anru et al. A Theoretical and Experimental Analysis of the Time-Domain Characteristics of a PRBS Phase-Modulated Laser System . | APPLIED SCIENCES-BASEL , 2024 , 14 (20) . |
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Abstract ：
Economic viability and durability are pivotal challenges limiting the commercial application of proton exchange membrane fuel cells (PEMFC). The development of low Pt usage oxygen reduction reaction catalysts with high catalytic activity and durability is imperative. Carbon support corrosion, as well as Pt particles agglomeration and exfoliation are primary causes of commercial Pt/C catalyst degradation. Here, a composite materials formed by TiO2 containing oxygen vacancy (O-V) and carbon nanotube (CNT) was used as a functional support to successfully load Pt nanoparticles (NPs). The oxygen vacancy facilitated interactions between TiO2(O-V) and Pt, enhancing the anchoring of Pt NPs and suppressing particle growth. The Pt/TiO2(O-V)-CNT demonstrates excellent performance with mass activity of 788 mA/mg(Pt) @0.85 V, the half-wave potential increased 34 mV and the tafel slope decreased by 11.89 mVdec(-1) compared to commercial Pt/C. The durability of Pt/TiO2(O-V)-CNT nearly 3-fold that of commercial Pt/C with negligible decay of half-wave potential (0.9 %) and mass activity (16 %). Density functional theory calculations and X-ray photoelectron spectroscopy indicated that the charge transfer from TiO2(O-V) to Pt facilitates the formation of strong metal-support interactions (SMSI), leading to a downward shift in the d-band center of Pt and a reduction in the binding strength to *OOH, thus lowering the activation energy of the rate-determining step which in turn promoting the activity of ORR. This study provides a reliable approach for designing catalysts with high activity and durability.
Keyword ：
High durability High durability Pt Pt TiO2 films TiO2 films Oxygen vacancy Oxygen vacancy Oxygen reduction reaction Oxygen reduction reaction
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| GB/T 7714 | Yan, An-ru , Wang, Xiao-bo , Zhu, Ling et al. Oxygen vacancy strategy enhancing the performance of TiO2/CNT supported ultrafine Pt catalyst for the oxygen reduction reaction [J]. | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2024 , 974 . |
| MLA | Yan, An-ru et al. "Oxygen vacancy strategy enhancing the performance of TiO2/CNT supported ultrafine Pt catalyst for the oxygen reduction reaction" . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY 974 (2024) . |
| APA | Yan, An-ru , Wang, Xiao-bo , Zhu, Ling , Liu, Xue-sheng , Wang, Zhi-yong . Oxygen vacancy strategy enhancing the performance of TiO2/CNT supported ultrafine Pt catalyst for the oxygen reduction reaction . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2024 , 974 . |
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Abstract ：
This study numerically explores the synchronization dynamics of a one-dimension edge-emitting laser array monolithically-integrated with an external cold cavity comprehensively, aiming to achieve an in-phase mode optical field. By employing the optical feedback rate equation, the impact of mutual feedback coefficient and coupling coefficient on the synchronization process are investigated thoroughly. The proposed external cold cavity, designed according to the Talbot effect, could significantly diminish the reflectivity of front facet through separated electrode structure, therefore facilitating the phase-locking process. Consequently, the study uncovers the effective regime for establishing in-phase mode operation. Additionally, the numerical analysis also reveals the vivid synchronization dynamic from a chaotic state to partially-phase-locked, then completely-phase-locked, and ultimately periodic oscillation. Furthermore, the impact of practical fabrication tolerances on the synchronization process are explored as well. Based on the simulation results, our work could offer valuable insights for steering the on-chip optical field and developing novel laser arrays with high beam quality. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Qi, Jun , Lan, Tian , Ma, Wanli et al. Numerical investigation of steering synchronization dynamics of laterally coupled laser array with monolithically-integrated external cold cavity [J]. | OPTICS EXPRESS , 2024 , 32 (22) : 38768-38779 . |
| MLA | Qi, Jun et al. "Numerical investigation of steering synchronization dynamics of laterally coupled laser array with monolithically-integrated external cold cavity" . | OPTICS EXPRESS 32 . 22 (2024) : 38768-38779 . |
| APA | Qi, Jun , Lan, Tian , Ma, Wanli , Zhang, Jinghao , Li, Ying , Lou, Yiwen et al. Numerical investigation of steering synchronization dynamics of laterally coupled laser array with monolithically-integrated external cold cavity . | OPTICS EXPRESS , 2024 , 32 (22) , 38768-38779 . |
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Abstract ：
In response to the demand for high-power, long-pulse-width 532 nm lasers in the medical and industrial processing fields, this paper explains how the laser cavity of a high-power Nd:YAG 532 nm laser can be extended while maintaining the laser's q-parameter by using a 4f optical system. The results show that at a repetition rate of 10 kHz, the extended cavity achieved a maximum average power of 112 W. Compared with the short cavity, the power was not significantly reduced. The pulse width was extended from 56 ns to 85 ns, and its broadening ratio reached 46.5%. The laser maintained good beam quality during high-power operation.
Keyword ：
Nd:YAG Nd:YAG long pulse width long pulse width acousto-optic Q-switched acousto-optic Q-switched intracavity frequency doubling intracavity frequency doubling 4f optical system 4f optical system
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| GB/T 7714 | Hu, Jiapeng , Li, Wenbo , Li, Dong et al. High-Power, High-Beam-Quality, Long-Pulse-Width 532 nm Laser Based on a 4f Optical System [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (21) . |
| MLA | Hu, Jiapeng et al. "High-Power, High-Beam-Quality, Long-Pulse-Width 532 nm Laser Based on a 4f Optical System" . | APPLIED SCIENCES-BASEL 14 . 21 (2024) . |
| APA | Hu, Jiapeng , Li, Wenbo , Li, Dong , Liu, Hongcai , Xia, Nanhui , Zhang, Tianyu et al. High-Power, High-Beam-Quality, Long-Pulse-Width 532 nm Laser Based on a 4f Optical System . | APPLIED SCIENCES-BASEL , 2024 , 14 (21) . |
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Abstract ：
为了提高980 nm激光二极管的光电性能,设计了Al组分内波导正向和外波导反向线性渐变的新型非对称双波导激光二极管.采用一维漂移扩散模型为理论基础,对新结构和传统结构进行了仿真模拟,并对比分析了两者的光电性能.光场分布表明,新结构通过改变波导折射率分布,减少了高阶模式数量,改善了基模的单模特性.能带排列表明,新型非对称双波导结构显著提高了电子和空穴泄漏的势垒,阻挡了载流子泄漏,增强了有源区的载流子限制能力,从而降低了有源区载流子浓度,提高了器件的内量子效率.与传统波导结构对比分析表明,新型非对称双波导结构激光二极管的阈值电流下降了 27.65％,工作电压降低了15.24％.在注入电流为5 A时,输出功率达到5.36 W,电光转换效率达到78.06％.设计的新型波导结构提高了980 nm激光二极管的光电性能,对研发高性能激光二极管具有重要的理论指导意义.
Keyword ：
激光二极管 激光二极管 Al组分渐变 Al组分渐变 双波导结构 双波导结构 光电性能 光电性能
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| GB/T 7714 | 胡雪莹 , 董海亮 , 贾志刚 et al. 980 nm渐变双波导激光二极管及其光电性能研究 [J]. | 激光与红外 , 2023 , 53 (3) : 370-376 . |
| MLA | 胡雪莹 et al. "980 nm渐变双波导激光二极管及其光电性能研究" . | 激光与红外 53 . 3 (2023) : 370-376 . |
| APA | 胡雪莹 , 董海亮 , 贾志刚 , 贾伟 , 梁建 , 王智勇 et al. 980 nm渐变双波导激光二极管及其光电性能研究 . | 激光与红外 , 2023 , 53 (3) , 370-376 . |
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Abstract ：
本文对环形激光阵列的Talbot效应进行了研究,利用Gyrator正则变换推导了极坐标下环形激光阵列的Talbot效应和自成像条件,并进一步分析了其在分数Talbot距离处的成像规律.通过FDTD Solutions软件对环形激光阵列在分数Talbot距离处的空间分布、相位分布进行模拟,得到与理论计算相一致的结果.通过与一维激光阵列分数Talbot效应的空间分布、相位分布情况进行对比分析,环形激光阵列可有效消除一维激光阵列的Talbot边缘效应,获得等光强分布的Talbot自再现像,扩展了 Talbot效应在环形激光相干阵列锁相的应用.
Keyword ：
环形激光阵列 环形激光阵列 自成像 自成像 Gyrator变换 Gyrator变换 相干阵列 相干阵列 分数Talbot效应 分数Talbot效应
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| GB/T 7714 | 李尉 , 代京京 , 温丛阳 et al. 利用Gyrator正则变换实现环形激光阵列的Talbot效应 [J]. | 物理学报 , 2023 , 72 (5) : 178-182 . |
| MLA | 李尉 et al. "利用Gyrator正则变换实现环形激光阵列的Talbot效应" . | 物理学报 72 . 5 (2023) : 178-182 . |
| APA | 李尉 , 代京京 , 温丛阳 , 宗梦雅 , 李胜南 , 王智勇 . 利用Gyrator正则变换实现环形激光阵列的Talbot效应 . | 物理学报 , 2023 , 72 (5) , 178-182 . |
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Abstract ：
为了实现高纯度脉冲柱矢量光的输出,提出并搭建基于对称双模耦合器的波长可切换的被动锁模柱矢量全光纤激光器.根据光纤传输原理得到基模向高阶模转换的折射率匹配直径,运用模式耦合模理论及光束传播法模拟分析了对称双模耦合器的结构参数对模式选择及耦合特性的影响,采用熔融拉锥法并免去传统的模式选择耦合器制作上的预拉锥工艺制作了对称双模耦合器,通过搭建一套被动锁模柱矢量全光纤激光器实现了中心波长1 039 nm和1 068 nm可切换、脉冲时间间隔为113.8 ns、重频为8.78 MHz、脉宽660 ps/656 ps、最大输出平均功率为5.25 mW/5.2 mW、模式纯度大于97%的柱矢量光输出.实验验证了对称双模耦合器的可行性,为后续高纯度柱矢量光的获得提供一种可行的方案.
Keyword ：
非线性偏振旋转锁模 非线性偏振旋转锁模 高纯度 高纯度 对称双模耦合器 对称双模耦合器 柱矢量光 柱矢量光 光纤激光器 光纤激光器
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| GB/T 7714 | 裴思琪 , 张天宇 , 张昆 et al. 基于对称双模耦合器的波长可切换柱矢量光纤激光器 [J]. | 光学精密工程 , 2023 , 31 (23) : 3395-3404 . |
| MLA | 裴思琪 et al. "基于对称双模耦合器的波长可切换柱矢量光纤激光器" . | 光学精密工程 31 . 23 (2023) : 3395-3404 . |
| APA | 裴思琪 , 张天宇 , 张昆 , 杨博义 , 朱云 , 胡佳鹏 et al. 基于对称双模耦合器的波长可切换柱矢量光纤激光器 . | 光学精密工程 , 2023 , 31 (23) , 3395-3404 . |
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Abstract ：
Electro-optic modulators (EOMs) based on a thin-film lithium niobate (TFLN) photonic integration platform play a crucial role in loading electrical signals onto optical signals. In this paper, we proposed on-chip EOMs operating at two commercially available wavelengths of 850 and 1550 nm and successfully demonstrated rather low voltage-length products (V-pi center dot Ls) of 0.78 V center dot cm and 1.29 V center dot cm, respectively. Additionally, the EOM working at 1550 nm exhibits the capability of 3-dB electro-optic (E-O) bandwidth beyond 40 GHz due to the limitation of our test conditions. This study is quite helpful for understanding EOM structures in a TFLN platform, as well as the fabrication of high-performance and multifunctional EOM devices.
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| GB/T 7714 | Li, Ying , Lan, Tian , Yang, Dengcai et al. High-Performance Mach-Zehnder Modulator Based on Thin-Film Lithium Niobate with Low Voltage-Length Product [J]. | ACS OMEGA , 2023 , 8 (10) : 9644-9651 . |
| MLA | Li, Ying et al. "High-Performance Mach-Zehnder Modulator Based on Thin-Film Lithium Niobate with Low Voltage-Length Product" . | ACS OMEGA 8 . 10 (2023) : 9644-9651 . |
| APA | Li, Ying , Lan, Tian , Yang, Dengcai , Bao, Jianfeng , Xiang, Meihua , Yang, Feng et al. High-Performance Mach-Zehnder Modulator Based on Thin-Film Lithium Niobate with Low Voltage-Length Product . | ACS OMEGA , 2023 , 8 (10) , 9644-9651 . |
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Abstract ：
本实用新型设计了一种宽带高分辨率光谱响应测量仪，主要应用于窄线宽光学滤波器的测量，可测得光学器件在不同频率下的插入损耗，包括可调谐光源发出波长连续可调的光信号，光信号作为载波进入电光调制器，可调频率源发射出射频信号输入电桥得到相位相差90°的两路射频信号作为调制信号输入到电光调制器；通过IQ调制器控制电光调制器的偏置电压，调制出载波抑制单边带信号。单边带信号被光分束器分成两路信号强度相等的光信号，一路经过待测光器件进入光电平衡探测器，另一路直接进入光电平衡探测器，数据与信号采集系统采集光电平衡探测器的输出信号，并进行处理，最终得到待测器件的光谱响应。
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| GB/T 7714 | 杨登才 , 冯凌阁 , 杨锋 et al. 一种宽带高分辨率光谱响应测量仪 : CN202221912938.7[P]. | 2022-07-21 . |
| MLA | 杨登才 et al. "一种宽带高分辨率光谱响应测量仪" : CN202221912938.7. | 2022-07-21 . |
| APA | 杨登才 , 冯凌阁 , 杨锋 , 王云新 , 王智勇 , 王卓 . 一种宽带高分辨率光谱响应测量仪 : CN202221912938.7. | 2022-07-21 . |
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Abstract ：
根据激光光束质量国际标准,采用光束质量M~2因子来评价相干阵激光的光束质量,并采用拟合相干阵激光传输双曲线方程的方法计算了相干阵激光在不同波长、子光源半径、占空比、阵列宽度等参数条件下的M~2值。考虑到采用拟合双曲线方程来计算M~2值存在较大的误差,同时采用桶中功率比(BQ)对相干阵激光的光束质量进行计算。根据所提出的BQ值与M~2值的关系式,通过计算BQ值得到相干阵激光在不同参数情况下稳定的M~2值。计算结果表明,相干阵激光的光束质量接近衍射极限。
Keyword ：
光束质量 光束质量 相干阵激光器 相干阵激光器 M~2因子 M~2因子 相干合成 相干合成 桶中功率比 桶中功率比
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| GB/T 7714 | 李尉 , 温丛阳 , 叶征宇 et al. 两维相干阵激光光束质量的分析 [J]. | 光电技术应用 , 2022 , 37 (02) : 36-40,73 . |
| MLA | 李尉 et al. "两维相干阵激光光束质量的分析" . | 光电技术应用 37 . 02 (2022) : 36-40,73 . |
| APA | 李尉 , 温丛阳 , 叶征宇 , 代京京 , 兰天 , 王智勇 . 两维相干阵激光光束质量的分析 . | 光电技术应用 , 2022 , 37 (02) , 36-40,73 . |
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