Optics and Laser Technology最新文献

英文中文

Real-time edge-enhanced 3D imaging via t-net-based dual-channel Fresnel incoherent correlation holography 基于t-net的双通道菲涅耳非相干全息术的实时边缘增强三维成像

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.optlastec.2026.114890

Tao Huang , Xiaoyu Han , Yuheng Wang , Huiyang Wang , Weina Zhang , Jianglei Di , Xiaoxu Lu , Liyun Zhong

Edge enhancement under incoherent illumination represents a pivotal research area in optical imaging, with widespread applications in target recognition, optical defect detection, precise positioning, and related fields. While high-order vortex phase-modulated Fresnel incoherent digital holography enables edge enhancement in three-dimensional (3D) imaging, it necessitates the capture of multiple phase-shifted vortex holograms, thereby constraining its real-time performance. To address this, we introduce a T-Net-based dual-channel incoherent digital holography approach for achieving real-time, high-precision edge enhancement. This method employs a dual-channel synchronous imaging module to acquire two fixed phase-shifted vortex holograms simultaneously in a single exposure. Subsequently, it integrates a three-step phase-shifting and backpropagation algorithm to facilitate rapid 3D imaging and edge-enhanced reconstruction. Experimental results indicate that the proposed method substantially enhances reconstruction accuracy and edge detail preservation while preserving high temporal resolution. Additional 3D imaging experiments confirm its efficacy in accentuating edge features of volumetric objects. This approach markedly boosts the efficiency and precision of edge enhancement reconstruction by fusing deep learning with incoherent digital holography. It provides a powerful, real-time solution for incoherent 3D imaging and extends its potential for use in high-demand applications.

非相干光照下的边缘增强是光学成像中的一个关键研究领域，在目标识别、光学缺陷检测、精确定位等领域有着广泛的应用。虽然高阶旋涡相位调制菲涅耳非相干数字全息技术能够在三维成像中实现边缘增强，但它需要捕获多个相移旋涡全息图，从而限制了其实时性。为了解决这个问题，我们引入了一种基于t- net的双通道非相干数字全息方法，以实现实时、高精度的边缘增强。该方法采用双通道同步成像模块，在一次曝光中同时获得两个固定相移涡全息图。随后，它集成了三步相移和反向传播算法，以促进快速3D成像和边缘增强重建。实验结果表明，该方法在保持高时间分辨率的同时，大大提高了重建精度和边缘细节的保留。另外的三维成像实验证实了它在突出体积物体边缘特征方面的有效性。该方法将深度学习与非相干数字全息相融合，显著提高了边缘增强重建的效率和精度。它为非相干3D成像提供了强大的实时解决方案，并扩展了其在高需求应用中的应用潜力。

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引用次数: 0

Laser-driven acceleration of super-heavy ions: towards the production of high-quality high-energy uranium ion beams 激光驱动的超重离子加速：朝着生产高质量高能铀离子束的方向发展

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-06 DOI: 10.1016/j.optlastec.2025.114598

Jarosław Domański, Jan Badziak

Super-heavy ion beams with ion energies ranging from multi-GeV to multi-TeV are a fundamental research tool in nuclear physics and high-energy density physics and are currently being produced in large RF-driven accelerators. Recent advances in high-peak-power laser technology and the development of multi-PW lasers have opened the prospect of producing such beams in much less complex and smaller laser-driven accelerators. In this paper, the feasibility of producing high-energy super-heavy ion beams by a multi-PW femtosecond laser and the properties of these beams are investigated numerically using an advanced particle-in-cell code. The studies were carried out for laser pulses of intensity ∼ (0.25–3) × 10²³ W/cm² interacting with a sub-micrometre uranium target. They demonstrated that the multi-PW laser can produce high-energy (up to 300 GeV) uranium ion beams with intensities (∼10²⁰ W/cm²) and durations (<1 ps) unattainable in conventional accelerators. The ion beam parameters can be controlled by various laser and target parameters but also by the ion beam width in the paraxial region. It was found that a paraxial ion beam with a width comparable to the laser focal spot size is a well-collimated, highly mono-charged and spatially homogeneous beam and is composed of ions with the highest energies. Improving the paraxial beam parameters is possible by reducing the target thickness and increasing the focal spot size, but primarily by increasing the laser intensity. However, increasing the intensity leads to increased radiative losses, which significantly limits the possibility of producing super-heavy ions with TeV energies.

离子能量从多gev到多tev的超重离子束是核物理和高能密度物理的基础研究工具，目前正在大型rf驱动加速器中产生。高峰值功率激光技术的最新进展和多pw激光器的发展为在更不复杂和更小的激光驱动加速器中产生这种光束开辟了前景。本文利用先进的粒子池码，研究了多pw飞秒激光器产生高能超重离子束的可行性，并对超重离子束的特性进行了数值模拟。研究是用强度为~ （0.25-3）× 1023 W/cm2的激光脉冲与亚微米铀靶相互作用进行的。他们证明了多pw激光器可以产生高能（高达300 GeV）铀离子束，其强度（~ 1020 W/cm2）和持续时间（<1 ps）是传统加速器无法实现的。离子束参数可以由各种激光和目标参数控制，也可以由近轴区域的离子束宽度控制。研究发现，宽度与激光焦点光斑大小相当的近轴离子束准直良好，具有高度的单电荷和空间均匀性，是由能量最高的离子组成的光束。通过减小目标厚度和增大焦点光斑尺寸可以改善近轴光束参数，但主要是通过增加激光强度来改善。然而，增加辐射强度会导致辐射损失增加，这极大地限制了产生TeV能量的超重离子的可能性。

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引用次数: 0

Fabrication and performance study of subwavelength metallic grating via nanoimprint lithography 纳米压印法制备亚波长金属光栅及其性能研究

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-06 DOI: 10.1016/j.optlastec.2026.114873

Yan Gu , Yingao Xue , Jieqiong Lin , Yuanshuo Liu , Yamei Liu , Kepeng Sui , Silin Liu , Hongxin Guo , Weidong Zhou , Lingling Han , Bin Wang

Subwavelength metallic gratings exhibit significant application potential due to their superior polarization characteristics and high structural stability, highlighting the urgent need for an efficient and cost-effective fabrication method. This study proposes, for the first time, a vibration-assisted nanoimprinting approach to fabricate subwavelength metallic gratings, achieving high-quality structures with outstanding polarization performance in the visible spectrum. A mathematical model was developed to analyze the effect of normal vibration on photoresist filling, providing insights into the underlying mechanism of enhanced filling efficiency. Numerical simulations were conducted to evaluate the influence of metallic materials and structural parameters on polarization performance. To implement this concept, a non-resonant vibration device was designed, and a vibration-assisted nanoimprint system was constructed to introduce normal vibration during the imprinting process. The effectiveness of vibration application was verified through vibration-assisted nanoimprinting experiments, in which the average width of the dielectric grating increased from 115 nm to 120 nm (a 4% improvement), and the average height increased from 118 nm to 136 nm (a 12% enhancement). Subwavelength metallic gratings were subsequently fabricated via a coating process and subjected to detailed performance characterization. When the incident angle varied within ± 30°, the average TM-wave transmittance exceeded 40.45%, while the average extinction ratio reached 21.3 dB. Across the visible spectrum, the TM wave showed an average transmittance of 45.41% and an extinction ratio of 20.39 dB, demonstrating excellent polarization performance. These findings confirm that vibration-assisted nanoimprinting is a promising and efficient technique for fabricating subwavelength metallic gratings.

亚波长金属光栅由于其优越的偏振特性和较高的结构稳定性，显示出巨大的应用潜力，迫切需要一种高效、经济的制造方法。本研究首次提出了一种振动辅助纳米印迹方法来制造亚波长金属光栅，在可见光谱中获得了具有出色偏振性能的高质量结构。建立了一个数学模型，分析了正常振动对光刻胶填充的影响，为提高填充效率的潜在机制提供了见解。通过数值模拟研究了金属材料和结构参数对极化性能的影响。为了实现这一概念，设计了一种非共振振动装置，并构建了振动辅助纳米压印系统，在压印过程中引入正常振动。通过振动辅助纳米印迹实验验证了振动应用的有效性，其中介质光栅的平均宽度从115 nm增加到120 nm（提高了4%），平均高度从118 nm增加到136 nm（提高了12%）。亚波长金属光栅随后通过涂层工艺制造，并进行了详细的性能表征。入射角在±30°范围内变化时，平均透射率超过40.45%，平均消光比达到21.3 dB。在可见光光谱上，TM波的平均透过率为45.41%，消光比为20.39 dB，具有良好的偏振性能。这些发现证实了振动辅助纳米印迹技术是一种很有前途的高效亚波长金属光栅制造技术。

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引用次数: 0

Laser-induced graphene on polyimide substrate for piezoresistive sensor application 聚酰亚胺基板上激光诱导石墨烯用于压阻式传感器

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.optlastec.2026.114850

Yuhan Liu , Renbao Wang , Bingnan Dong , Zhongwei Zhang , Dongfeng Qi , Hao Wei , Yanwen Yuan , Juan Wei , Hongyou Cui

The outstanding electrical properties of graphene have initiated extensive research. However, its practical application remains constrained by prohibitive fabrication costs and complex manufacturing processes. Laser-induced graphene (LIG) technology provides an innovative solution to this challenge through its low-cost fabrication and high-efficiency patterning capabilities. This study systematically investigated the effects of laser parameters on graphene surface morphology and electrical conductivity. The electrical conductivity of graphene was substantially enhanced by fabricating structures characterized by low-density micron-scale apertures. The excellent mechanical flexibility of the polyimide (PI) substrate provides an ideal platform for piezoresistive sensors. Graphene was fabricated on the PI surface, and a piezoresistive sensor featuring a “Trapezoidal Parallel Resistor Network” patterned structure was fabricated. The fabricated sensor demonstrated high sensitivity (1.34 × 10^-3 kPa⁻¹), rapid response characteristics (44 ms), and exceptional stability maintained over 15,000 testing cycles. This sensor advances smart wearable devices through biomedical monitoring of human motion and physiological signals. Moreover, the piezoresistive behavior further enables secure cryptographic operations via Morse code modulation.

石墨烯优异的电学性能引发了广泛的研究。然而，它的实际应用仍然受到高昂的制造成本和复杂的制造工艺的限制。激光诱导石墨烯（LIG）技术通过其低成本的制造和高效的图像化能力，为这一挑战提供了一种创新的解决方案。本研究系统地研究了激光参数对石墨烯表面形貌和电导率的影响。通过制造具有低密度微米级孔径的结构，石墨烯的导电性大大增强。聚酰亚胺（PI）衬底优异的机械柔韧性为压阻式传感器提供了理想的平台。在PI表面制备了石墨烯，制备了具有“梯形并联电阻网络”图案结构的压阻传感器。制作的传感器具有高灵敏度（1.34 × 10-3 kPa−1），快速响应特性（44 ms），并且在超过15,000个测试周期中保持了出色的稳定性。该传感器通过对人体运动和生理信号的生物医学监测，推动了智能可穿戴设备的发展。此外，压阻特性进一步实现了通过莫尔斯电码调制的安全加密操作。

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引用次数: 0

Role of substrate temperature in clad geometry and flow behavior during directed energy deposition of IN718 superalloy: Multiphysics modeling and experimental validation IN718高温合金定向能沉积过程中衬底温度对覆层几何形状和流动行为的影响：多物理场建模和实验验证

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.optlastec.2026.114910

Yanming Liu , Weiwei Liu , Yali Ma , Zhi Wang , Hongchao Zhang

Nickel-based superalloys are highly sensitive to thermal history during laser directed energy deposition (L-DED), which in turn directly affects the cladding layer geometry and heat flow characteristics. In this study, a multiphysics computational fluid dynamics (CFD) model is established based on the volume of fluid (VOF) method, and a combination of simulation and experimental approaches is employed to systematically investigate the effect of substrate temperature on the cladding layer geometry and melt pool flow behavior of the IN718 superalloy. The results show that as the substrate temperature increases, the width of the cladding layer increases, the cladding height exhibits a nonlinear variation, and the peak temperature within the melt pool also increases. Furthermore, the flow dynamics at the free surface of the melt pool influence the relationship between the substrate temperature and the geometry of the cladding layer. Finally, a dimensionless parameter analysis quantitatively reveals that increased substrate temperatures intensify Marangoni convection. This study provides a theoretical basis for precisely controlling the cladding layer geometry by modulating the substrate temperature.

镍基高温合金在激光定向能沉积（L-DED）过程中对热历史高度敏感，从而直接影响熔覆层的几何形状和热流特性。本研究基于流体体积法（VOF）建立了多物理场计算流体动力学（CFD）模型，采用模拟与实验相结合的方法，系统研究了基体温度对IN718高温合金熔覆层几何形状和熔池流动行为的影响。结果表明：随着衬底温度的升高，熔覆层宽度增大，熔覆层高度呈非线性变化，熔池内峰值温度也随之升高；此外，熔池自由表面的流动动力学影响了基材温度与熔覆层几何形状之间的关系。最后，无量纲参数分析定量地揭示了衬底温度升高会加剧马兰戈尼对流。该研究为通过调节衬底温度来精确控制熔覆层的几何形状提供了理论依据。

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引用次数: 0

Performance analysis of Laser-Ablated Triple-Junction solar cells using spectral response properties 利用光谱响应特性分析激光烧蚀三结太阳能电池的性能

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-04 DOI: 10.1016/j.optlastec.2026.114868

Wei Guo, Jifei Ye, Hao Chang, Chenghao Yu, Sai Li, Hongjie Kong

This study investigates the effects of pulsed laser irradiation (532 nm and 1064 nm) on the performance of GaInP/GaAs/Ge triple-junction solar cells and their subcells. The analysis was conducted through electroluminescence (EL) characterization and electrical performance testing. The results reveal that lasers of different wavelengths induce distinct damage patterns in the multi-junction solar cells. The unique spectral response characteristics of each subcell cause this effect. The 532 nm laser is primarily absorbed by the GaInP top cell, leading to its initial performance degradation and influence on red-light emission capability. The 1064 nm laser penetrates to the GaInP top cell, directly damaging the GaAs and Ge layers, which causes their performance to decline and influences the infrared light emission capability. As the laser energy density increases, the extent of cell damage intensifies, and the subcells lose their luminescence and photoelectric conversion capabilities. This research reveals the wavelength-dependent damage mechanisms of lasers in multi-junction solar cells. It provides a reference for the reliability assessment and protective design of solar cells for space applications.

研究了脉冲激光辐照（532 nm和1064 nm）对GaInP/GaAs/Ge三结太阳能电池及其亚电池性能的影响。通过电致发光（EL）表征和电性能测试进行分析。结果表明，不同波长的激光在多结太阳能电池中产生不同的损伤模式。每个亚细胞独特的光谱响应特性导致了这种效果。532 nm的激光主要被GaInP顶层电池吸收，导致其初始性能下降并影响红光发射能力。1064 nm激光穿透到GaInP顶层电池，直接破坏GaAs和Ge层，导致其性能下降，影响其红外发射能力。随着激光能量密度的增大，细胞损伤程度加剧，亚细胞失去发光和光电转换能力。本研究揭示了激光在多结太阳能电池中随波长变化的损伤机理。为空间应用太阳能电池的可靠性评估和防护设计提供了参考。

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引用次数: 0

Light dragging in Landau-quantized graphene with pump-induced magnetoelectric chirality 朗道量子化石墨烯中具有泵致磁电手性的光拖曳

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.optlastec.2026.114866

Fazal Badshah , Zia Ullah , Haiyang Zhang , Muhammad Idrees , Misbah Qurban , Haibo Huang , Yuan Zhou

The phenomenon of light dragging refers to the alteration in the propagation path of light as it traverses through a moving or dynamic medium. This subtle effect is pivotal for detecting extremely low group velocities of light, a capability with significant implications in quantum technologies such as coherent state transfer, the implementation of quantum gates, and long-lived quantum memories. In this work, we report to the best of our knowledge the first theoretical demonstration of the light-dragging effect in the context of Landau-quantized graphene. The underlying mechanism responsible for this effect originates from nonlinear chirality induced during a Raman gain process in the Landau levels of graphene. Specifically, the interaction of a magnetic dipole transition with an electric dipole transition facilitates Raman gain-assisted chirality. This interplay gives rise to strong magnetoelectric cross-coupling, allowing two Raman pathways to interfere via a shared magnetic-dipole transition. We explore the resulting modifications in both the group index and refractive index spectra, revealing pronounced signatures of magnetoelectric-induced dispersion. Our proposed framework paves the way for the design of advanced photonic devices with enhanced optical performance, potentially offering a novel route toward sub-wavelength imaging and precise resolution of nanoscale structures.

光拖现象是指光穿过运动或动态介质时传播路径的改变。这种微妙的效应对于探测极低的光群速度至关重要，这是一种在量子技术中具有重要意义的能力，如相干态转移、量子门的实现和长寿命量子存储器。在这项工作中，据我们所知，我们报告了朗道量子化石墨烯背景下的光拖效应的第一个理论证明。这种效应的潜在机制源于石墨烯朗道能级拉曼增益过程中诱导的非线性手性。具体来说，磁偶极子跃迁与电偶极子跃迁的相互作用促进了拉曼增益辅助手性。这种相互作用产生了强磁电交叉耦合，允许两个拉曼路径通过共享磁偶极子跃迁进行干扰。我们探索了由此产生的群折射率和折射率谱的变化，揭示了磁电致色散的明显特征。我们提出的框架为设计具有增强光学性能的先进光子器件铺平了道路，可能为亚波长成像和纳米级结构的精确分辨率提供了新的途径。

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引用次数: 0

Synergistic mechanism of thermal accumulation and shielding effects in burst-mode femtosecond laser ablation of SiC 突发模式飞秒激光烧蚀SiC中热积累与屏蔽效应的协同机制

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-12 DOI: 10.1016/j.optlastec.2026.114917

Guangxian Li , Qijian Zhu , Ruiguang Fan , Luyang Ding , Yu Long , Lili Yuan , Wei Wei

Femtosecond laser ablation (FLA) offers distinct advantages for high-performance machining, such as controllable energy input and extremely high peak power. To further enhance its capabilities for processing ultra-hard materials, burst-mode FLA has emerged as a prominent research focus, which improves machining efficiency and limits thermal defects. This paper comprehensively investigates the machining of SiC via ultraviolet FLA in MHz burst mode. Temperature fields based on the two-temperature model were simulated, which investigated the electron-lattice thermal coupling disparities under varying sub-pulse numbers. The mechanism of how thermal accumulation synergy mechanism in burst-mode enhances was revealed. It was found that low-energy and multi-sub-pulse output strategy of burst-mode FLA induces sustained residual thermal accumulation in lattice, thereby enhancing energy utilization efficiency. Material removal mechanisms exhibit diverse pathways with dynamic sub-pulse energies. Furthermore, this study establishes the correlation between the decline in MRR under high laser repetition rates and the shielding effect through discrete wavelet transform time–frequency analysis of acoustic emission signals. These results demonstrate that precise energy modulation of sub-pulses in burst-mode FLA is critical for the improvement of surface finish and machining efficiency, providing significant guidance for future applications achieving high-quality and high-efficiency micromachining of SiC.

飞秒激光烧蚀（FLA）在高性能加工中具有能量输入可控和峰值功率极高等明显优势。为了进一步提高其加工超硬材料的能力，爆发模式FLA已成为一个突出的研究热点，以提高加工效率和限制热缺陷。本文全面研究了在MHz突发模式下用紫外FLA加工SiC的方法。基于双温度模型对温度场进行了模拟，研究了不同子脉冲数下的电子-晶格热耦合差异。揭示了爆发模式下热积累协同机制增强的机理。研究发现，低能量、多次脉冲的爆发模式FLA输出策略可诱导晶格内持续的残余热积累，从而提高能量利用效率。在动态亚脉冲能量下，材料的去除机制表现出多种途径。此外，本文通过对声发射信号进行离散小波变换时频分析，建立了高激光重复率下MRR下降与屏蔽效应的相关性。这些结果表明，在突发模式FLA中精确调制子脉冲的能量对于提高表面光洁度和加工效率至关重要，为实现高质量和高效率的碳化硅微加工提供了重要的指导。

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引用次数: 0

A Non-Contact method for plasma state perception in laser shock peening using Acoustic-Visual signal fusion 一种基于声视信号融合的非接触激光冲击强化等离子体状态感知方法

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-12 DOI: 10.1016/j.optlastec.2026.114899

Guangyuan Shi , Junlin Chen , Qi Qi , Shilei Xiong , Yuanbin Wang , Minchao Cui , Ming Luo

Laser shock peening (LSP) is a typical multi-physics coupling manufacturing process. The use of multimodal information allows for a more comprehensive understanding of plasma state evolution. The spatiotemporal characteristics of the plasma during LSP of γ-TiAl alloy were investigated by simultaneously collecting acoustic signals and high-speed image data. The effects of different laser energies, probe angles, and distances on the acoustic signal were analyzed. The results show that the acoustic signal exhibits a typical ‘N-shaped wave’ characteristic and demonstrates spherical wave propagation. Additionally, the flight time decreases as the laser energy increases. After absorbing the laser energy, the plasma expands rapidly and then decays quickly. The decay rate near the water surface is faster, and the overall plasma lifetime is approximately 80 microseconds. Based on these data, a 2D-3D CNN deep learning model, integrating both acoustic and visual signals, was developed for plasma state perception. The decision-level fusion model achieved an accuracy of 94.6%, while the feature-level fusion model reached 91.9%, significantly outperforming the single-modal models (visual: 89.7%; acoustic: 85.0%). These results demonstrate that the fusion of acoustic and visual signals is highly effective for plasma state perception, offering a new approach for intelligent monitoring and quality control in LSP.

激光冲击强化是一种典型的多物理场耦合制造工艺。使用多模态信息可以更全面地了解等离子体状态的演变。通过同时采集声学信号和高速图像数据，研究了γ-TiAl合金LSP过程中等离子体的时空特征。分析了不同激光能量、探头角度和距离对声信号的影响。结果表明，声信号表现出典型的“n形波”特征，并呈现球形传播。此外，飞行时间随着激光能量的增加而减少。在吸收激光能量后，等离子体迅速膨胀，然后迅速衰减。水面附近的衰减速度更快，整个等离子体寿命约为80微秒。基于这些数据，我们开发了一个集成了声学和视觉信号的2D-3D CNN深度学习模型，用于等离子体状态感知。决策级融合模型的准确率为94.6%，特征级融合模型的准确率为91.9%，明显优于单模态模型（视觉：89.7%；声学：85.0%）。实验结果表明，声视信号融合对等离子体状态感知是非常有效的，为LSP的智能监测和质量控制提供了一种新的途径。

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引用次数: 0

Observation of centrally converging airflow columns induced by heat accumulation in high-repetition-rate femtosecond laser filaments 高重复率飞秒激光细丝热积累引起的中心辐合气流柱的观察

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-11 DOI: 10.1016/j.optlastec.2026.114918

Zheyuan Hou , Xinyu Liu , Tie-Jun Wang , Yaoxiang Liu , Yingxia Wei , Xianwang Li , Yuxin Leng

This study first reveals a thermally driven airflow phenomenon in high-repetition-rate (1 ∼ 100 kHz) femtosecond laser filaments, characterized by the formation of a stable, perpendicularly oriented central converging airflow column. Using transverse optical shadowgraphy, we directly visualize the filament-induced flow dynamics and find that the airflow intensity and spatial coherence increase almost linearly with repetition rates above 10 kHz. Thermofluidic simulations indicate that cumulative heat deposition from successive pulses governs the evolution of airflow column, transforming initially diffuse vortices into a symmetric dual-vortex structure. And the particle-tracing simulations confirm that acoustic heating contributes negligibly to the overall flow dynamics. These findings further confirm that heat accumulation plays a predominant role in governing filament–air interactions and reveal a distinct thermally induced converging airflow phenomenon, offering new insight into the thermal dynamics of high-repetition-rate filamentation.

该研究首先揭示了高重复率（1 ~ 100 kHz）飞秒激光细丝中热驱动的气流现象，其特征是形成稳定的、垂直定向的中央收敛气流柱。利用横向光学阴影成像技术，我们直接看到了灯丝诱导的流动动力学，并发现气流强度和空间相干性随着重复频率在10 kHz以上几乎呈线性增加。热流体模拟表明，连续脉冲的累积热沉积控制了气流柱的演化，将最初的弥漫性涡转变为对称的双涡结构。粒子示踪模拟证实了声加热对整体流动动力学的影响可以忽略不计。这些发现进一步证实了热积累在控制丝-空气相互作用中起主导作用，并揭示了一种独特的热诱导辐合气流现象，为高重复率丝的热动力学提供了新的见解。

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引用次数: 0

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