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学者姓名：王智勇
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Abstract ：
All-optical modulators are crucial in optical communication, quantum communication, and microwave photonics, owing to their low insertion loss and high efficiency. Thermo-optical modulators, a key subset of alloptical modulators, have been extensively studied, particularly those based on fiber optics and twodimensional materials. However, silicon photonic modulators incorporating two-dimensional materials remain relatively underexplored. This paper introduces a novel thermally induced phase shift model to provide a deeper understanding of the effects of thermal phase shifts on waveguide modes. A Mach-Zehnder interferometric modulator, utilizing graphene oxide thin films and silicon photonic technology, was designed, fabricated, and experimentally characterized. The sensor exhibited a sensitivity of 0.02127 dB/degrees C, with a linear fitting coefficient (R2) of 0.99905 over a temperature range of 25-55 degrees C. Furthermore, the phase modulator exhibited a modulation efficiency of 0.03596 rad/mW, with a linear fitting coefficient of 0.99359. The proposed thermal phase shift model can serve as a novel framework for designing and optimizing thermal modulators based on two-dimensional materials, offering valuable insights for future research and development in this field.
Keyword ：
Two-dimensional materials Two-dimensional materials Integrated photonics Integrated photonics Optical waveguide modulator Optical waveguide modulator Reduced graphene oxide (rGO) Reduced graphene oxide (rGO)
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| GB/T 7714 | Shen, Pengfei , Lan, Tian , Yang, Feng et al. On-chip compact thermo-optic phase shifter based on reduced graphene oxide (rGO) film and mach-zehnder interferometer [J]. | OPTICAL MATERIALS , 2025 , 159 . |
| MLA | Shen, Pengfei et al. "On-chip compact thermo-optic phase shifter based on reduced graphene oxide (rGO) film and mach-zehnder interferometer" . | OPTICAL MATERIALS 159 (2025) . |
| APA | Shen, Pengfei , Lan, Tian , Yang, Feng , Liu, Kunlun , Li, Ying , Xiang, Meihua et al. On-chip compact thermo-optic phase shifter based on reduced graphene oxide (rGO) film and mach-zehnder interferometer . | OPTICAL MATERIALS , 2025 , 159 . |
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Abstract ：
Gallium nitride (GaN) exhibits distinctive physical and chemical properties that render it indispensable in a multitude of electronic and optoelectronic devices. Given that GaN is a typical hard and brittle material that is difficult to machine, femtosecond laser technology provides an effective and convenient tool for processing such materials. However, GaN undergoes complex physical and chemical changes during high-power ablation, which poses a challenge to high-precision processing with controllable geometry. In this study, the quantitative relationship between the parameters of a single-pulse femtosecond laser and GaN ablation morphology was investigated using isotherm distribution. A multiphysics model using COMSOL Multiphysics (R) was developed to generate the isothermal distributions. Experiments were conducted on the femtosecond laser ablation of GaN at various single-pulse energies, and the resulting ablation morphologies were compared with the predictions from the multiphysics model. The comparison demonstrated that the calculated isotherm distribution accurately predicted not only the ablation diameter and depth but also the crater shape across a broad range of laser fluences. The predicted errors of the ablation diameters and depths were within 4.71% and 10.9%, respectively. The root mean square error (RMSE) and coefficient of determination (R2) were employed to evaluate the prediction errors associated with the crater shapes, which fell within the range of 0.018-0.032 mu m and 0.77-0.91, respectively. This study can provide an important reference for utilizing femtosecond lasers in the precise ablation of GaN to achieve desired geometries.
Keyword ：
GaN film GaN film multiphysics model multiphysics model ablation morphology ablation morphology femtosecond laser femtosecond laser
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| GB/T 7714 | Wang, Mingyuan , Zhang, Tong , Yuan, Yanping et al. Simulation and Experimental Study of the Single-Pulse Femtosecond Laser Ablation Morphology of GaN Films [J]. | MICROMACHINES , 2025 , 16 (1) . |
| MLA | Wang, Mingyuan et al. "Simulation and Experimental Study of the Single-Pulse Femtosecond Laser Ablation Morphology of GaN Films" . | MICROMACHINES 16 . 1 (2025) . |
| APA | Wang, Mingyuan , Zhang, Tong , Yuan, Yanping , Wang, Zhiyong , Liu, Yanlei , Chen, Lin . Simulation and Experimental Study of the Single-Pulse Femtosecond Laser Ablation Morphology of GaN Films . | MICROMACHINES , 2025 , 16 (1) . |
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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 ：
In-phase coherent vertical cavity surface emitting laser (VCSEL) arrays have desirable properties for high-brightness laser applications. We employ mutual injection feedback modeling of ring VCSEL arrays with fractional Talbot cavity to select their supermodes. An analysis of the effects of Talbot cavity lengths on engineering the coupling coefficient and gain threshold for in-phase mode operation is provided through the overlapping integrals of optical field distributions. An example design for 24-element arrays with a fractional Talbot cavity is presented, and the in-phase far-field distribution is obtained. This provides a potential method for fabricating Bessel Gaussian beams using larger ring VCSEL arrays.
Keyword ：
Phased arrays Phased arrays Vertical cavity surface emitting lasers Vertical cavity surface emitting lasers Couplings Couplings vertical-cavity surface-emitting laser (VCSEL) vertical-cavity surface-emitting laser (VCSEL) Optical arrays Optical arrays Semiconductor laser arrays Semiconductor laser arrays in-phase mode in-phase mode Laser radar Laser radar Coherent array Coherent array fractional talbot cavity fractional talbot cavity Optical sensors Optical sensors
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| GB/T 7714 | Li, Wei , Dai, Jing Jing , Li, Sheng Nan et al. In-Phase Supermode Operation in Ring Coherent VCSEL Arrays With a Fractional Talbot Cavity [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (23) : 8263-8268 . |
| MLA | Li, Wei et al. "In-Phase Supermode Operation in Ring Coherent VCSEL Arrays With a Fractional Talbot Cavity" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 42 . 23 (2024) : 8263-8268 . |
| APA | Li, Wei , Dai, Jing Jing , Li, Sheng Nan , Jin, Dong Yue , Wang, Zhi Yong . In-Phase Supermode Operation in Ring Coherent VCSEL Arrays With a Fractional Talbot Cavity . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (23) , 8263-8268 . |
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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 ：
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 ：
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 ：
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 ：
本发明公开了一种激光加热光纤熔融的拉锥方法，包括以下步骤：下位机实时监测加热区域的温度，并把监测到的所述温度生成相应的温度值，反馈给上位机；所述上位机根据所述下位机反馈的温度值的变化，调整拉锥平台拉锥速度。本发明还公开了一种实现激光加热光纤熔融的拉锥方法的拉锥系统，主要包括下位机和下位机，所述下位机用于实时监测加热区域的温度，并把监测到的所述温度生成相应的温度值，反馈给上位机，所述上位机用于根据所述下位机反馈的温度值的变化，调整拉锥平台拉锥速度。本发明具有提高了光纤分光比达到要求的比率和方便维修人员及时维修等优点。
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| GB/T 7714 | 王智勇 , 阴钰毅 , 葛廷武 . 一种激光加热光纤熔融的拉锥方法及其拉锥系统 : CN202310572409.X[P]. | 2023-05-19 . |
| MLA | 王智勇 et al. "一种激光加热光纤熔融的拉锥方法及其拉锥系统" : CN202310572409.X. | 2023-05-19 . |
| APA | 王智勇 , 阴钰毅 , 葛廷武 . 一种激光加热光纤熔融的拉锥方法及其拉锥系统 : CN202310572409.X. | 2023-05-19 . |
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