IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-20 DOI: 10.1016/j.ijleo.2025.172601

M.K. El-Adawi, S.A. Shalaby, S.S. Mostafa, S.A. Antar

Laser interaction with matter is one of the fundamental fields of the thermophysics.

The problem of heating an isolated finite homogenous silver sulphide

(A g_{2} S)

slab induced by a laser pulse is studied. Indeed pulsed laser are used in a variety of material processing applications.

The aim of the study is to evaluate quantitatively the thermal effects induced in the irradiated target. The output results will have essential importance in the field of technological applications.

In the present trial, the parabolic heat conduction equation is solved using Laplace integral transform technique which is one of the powerful methods in the field of mathematical physics. An express for the temperature field within the target is obtained.

The functional dependence of the temperature on the parameters of the laser pulse is clarified.

The computations makes it possible to evaluate the critical time required to initiate damage at the front surface, which is a starting point for medical, military, industrial applications.

An illustrative example on silver sulfide slab is given.

激光与物质的相互作用是热物理学的基本领域之一。研究了用激光脉冲加热孤立的有限均质硫化银Ag2S板的问题。实际上，脉冲激光用于各种材料加工应用。本研究的目的是定量地评价辐照靶中所引起的热效应。其产出结果在技术应用领域将具有至关重要的意义。本文采用拉普拉斯积分变换技术求解抛物型热传导方程，这是数学物理领域中最有力的方法之一。得到了靶内温度场的表达式。阐明了温度对激光脉冲参数的函数依赖性。计算使评估在前表面启动损坏所需的临界时间成为可能，这是医疗，军事，工业应用的起点。给出了硫化银板坯的实例。

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引用次数: 0

Hybrid self-attention aided generative adversarial network for hazy image restoration 模糊图像恢复的混合自关注辅助生成对抗网络

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-20 DOI: 10.1016/j.ijleo.2025.172611

Wende Dong , Tianheng Xu , Muhan Ji , Gang Luo , Geng Li , Zhenzhen Zheng

In hazy weather, suspended particles in the air cause significant image degradation by attenuating and scattering light. This degradation poses substantial challenges to subsequent image processing tasks, such as target recognition and positioning. Existing methods often struggle to balance global atmospheric light estimation with fine-detail preservation, leading to residual haze or over-enhancement and color distortion. Inspired by attention mechanisms, we design a hazy image restoration architecture utilizing an improved U-Net based generative adversarial network (GAN), enhanced by a novel hybrid attention mechanism. This mechanism integrates a global attention modulator, a window-based multi-head self-attention module, and a locally enhanced feedforward network, enabling the model to effectively capture both global and local image features while mitigating the artifacts seen in prior work. The network is trained using a tailored loss function that combines pixel loss, adversarial loss, and edge loss, specifically designed for the image dehazing task. Extensive experiments conducted on synthetic and real hazy images demonstrate that the proposed method consistently delivers high-quality dehazed images with exceptional clarity and contrast, outperforming several state-of-the-art methods.

在雾蒙蒙的天气里，空气中的悬浮粒子通过衰减和散射光线，造成明显的图像退化。这种退化给后续的图像处理任务，如目标识别和定位带来了巨大的挑战。现有的方法往往难以平衡全局大气光估计与精细细节的保存，导致残留雾霾或过度增强和颜色失真。受注意机制的启发，我们利用改进的基于U-Net的生成对抗网络（GAN）设计了一个模糊图像恢复架构，并通过一种新的混合注意机制进行增强。该机制集成了全局注意调制器、基于窗口的多头自注意模块和局部增强前馈网络，使模型能够有效捕获全局和局部图像特征，同时减轻先前工作中看到的伪像。该网络使用定制的损失函数进行训练，该函数结合了像素损失、对抗损失和边缘损失，专门为图像去雾任务而设计。在合成和真实模糊图像上进行的大量实验表明，所提出的方法始终如一地提供高质量的去雾图像，具有出色的清晰度和对比度，优于几种最先进的方法。

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引用次数: 0

High-power wavelength-stabilized amplified spontaneous emission source enabled by 974 nm LD and hybrid integration 利用974 纳米LD和混合集成实现高功率波长稳定放大自发发射源

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-20 DOI: 10.1016/j.ijleo.2025.172609

Yongkang Yang , Baiang Qu , Hongjie Xu , Manqing Tan , Wentao Guo

The amplified spontaneous emission (ASE) source is widely used in fiber-optic gyroscopes due to its broadband spectrum, which suppresses backscattering- and Kerr-effect–induced phase errors while reducing polarization coupling noise. However, thermally induced wavelength drift remains a critical limitation in ultrahigh-precision systems, as even small spectral shifts introduce non-negligible phase noise. To address this challenge, we propose a wide-temperature wavelength-selective reflection strategy that integrates a wavelength-division multiplexer, optical filter, and reflector into a compact hybrid structure, achieving a mean drift rate below 0.1 ppm/°C across the full operational range. This work presents a significant advance in ASE source technology through the integration of dual fiber Bragg gratings (FBGs) at the 974 nm laser diode (LD) output and a monolithically packaged passive-component module. Comprehensive theoretical modeling and experimental characterization of LD–ASE spectral–power correlations enabled the development of a thermally optimized dual-pass architecture achieving three major performance breakthroughs: (1) ultra-stable wavelength performance with drift below 0.1 ppm/°C over –25°C to + 60°C, (2) ASE output power above 25 mW with < 5 % variation across the temperature cycle, and (3) a record-high optical conversion efficiency exceeding 20 %. These results establish new performance benchmarks for ASE sources used in ultrahigh-precision fiber-optic gyroscopes operating under extreme environmental conditions. The dual-FBG wavelength-stabilization method and hybrid integrated architecture effectively address long-standing challenges in maintaining spectral purity and power efficiency under thermal stress, marking a substantial advancement in photonic light-source technology for precision inertial navigation.

放大自发发射（ASE）源具有宽带频谱特性，可抑制后向散射和克尔效应引起的相位误差，同时降低极化耦合噪声，在光纤陀螺仪中得到广泛应用。然而，热诱导波长漂移仍然是超高精密系统的一个关键限制，因为即使是很小的光谱位移也会引入不可忽略的相位噪声。为了应对这一挑战，我们提出了一种宽温度波长选择反射策略，该策略将波分复用器、光学滤波器和反射器集成到一个紧凑的混合结构中，在整个工作范围内实现低于0.1 ppm/°C的平均漂移率。这项工作通过在974 nm激光二极管（LD）输出端集成双光纤布拉格光栅（fbg）和单片封装无源组件模块，展示了ASE源技术的重大进步。对LD-ASE光谱功率相关性的全面理论建模和实验表征使热优化双通架构的开发实现了三个主要性能突破：(1)超稳定的波长性能，在-25°C至+ 60°C范围内的漂移低于0.1 ppm/°C, (2) ASE输出功率高于25 mW，在整个温度周期内变化<； 5 %,(3)创纪录的高光转换效率超过20 %。这些结果为在极端环境条件下工作的超高精度光纤陀螺仪中使用的ASE源建立了新的性能基准。双光纤光栅波长稳定方法和混合集成架构有效解决了在热应力下保持光谱纯度和功率效率的长期挑战，标志着用于精确惯性导航的光子光源技术取得了实质性进展。

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引用次数: 0

Machine learning K-means algorithm applied to wavefront sensing in Bi-Ronchi/Hartmann tests with SLM 机器学习K-means算法在Bi-Ronchi/Hartmann SLM测试波前传感中的应用

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-20 DOI: 10.1016/j.ijleo.2025.172607

J. Arriaga Hernández , B. Cuevas Otahola , A. Diaz Nayotl , A. Jaramillo Núñez , A. Pérez Villegas , O. Valenzuela

We apply new machine learning (ML) technologies to optimize the Hartmann test (HT) and Bi-Ronchi test (BRT) regarding the recognition, identification, and localization of the centroids in experimental Hartmanngrams and Bi-Ronchigrams. We replace the conventional rigid Hartmann screen (Hartmann mask, HM) with structured apertures implemented via a spatial light modulator (SLM), which enables the generation of multiple patterns with different aperture geometries. Based on the classical HM with circular apertures, we build square apertures for the Bi-Ronchi mask (BRM). We designed an experimental setup based on an SLM with a laser illumination system and implemented an unsupervised Centroid Clustering Algorithm (uCCA), based on the ML algorithm

K

-means, to identify the geometries of the centroids, followed by their segmentation and localization by clustering. We compare the experimental and theoretical Bi-Ronchigrams (or Hartmanngrams) to obtain a point cloud of transverse aberrations (

P C_{T A}

). We apply the point cloud method (PCM) to obtain an integrable surface from the points in

P C_{T A}

. Finally, we replace the numerical integration of

P C_{T A}

with transverse aberrations (

T A

) and a directional derivative approach based on the Eikonal equation, solved using Gaussian quadrature to obtain the wavefront. We compare our results with the Zernike aberration polynomials for sensing optical elements from the aberrations of the system by means of the aberrations of its wavefront

W (ρ, θ)

.

我们应用新的机器学习（ML）技术来优化Hartmann测试（HT）和Bi-Ronchi测试（BRT）对实验Hartmann图和bi - ronchgram中质心的识别、识别和定位。我们将传统的刚性哈特曼屏幕（哈特曼掩模，HM）替换为通过空间光调制器（SLM）实现的结构化孔径，从而能够生成具有不同孔径几何形状的多种图案。在经典的圆孔HM的基础上，我们构建了方形孔的Bi-Ronchi掩模（BRM）。我们设计了一个基于激光照明系统的SLM实验装置，并实现了一种基于ML算法K-means的无监督质心聚类算法（uCCA），以识别质心的几何形状，然后通过聚类对其进行分割和定位。我们比较了实验和理论的双ronchgram（或hartmanngram）来获得横向像差（PCTA）点云。我们应用点云方法（PCM）从PCTA中的点得到一个可积曲面。最后，我们用横向像差（TA）和基于Eikonal方程的方向导数方法代替PCTA的数值积分，用高斯正交法求解得到波前。我们用系统的波前像差W（ρ,θ）与Zernike像差多项式比较了我们的结果。

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引用次数: 0

The design and TLM analysis of a compact graphene-based dual-band bandpass plasmonic filter with hybrid post-fabrication tunability via liquid crystal in the terahertz regime 基于石墨烯的紧凑双带带通等离子体滤波器的设计和TLM分析，该滤波器在太赫兹波段具有液晶混合调制后可调谐性

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-20 DOI: 10.1016/j.ijleo.2025.172610

Iman Razmkhah, Zahra Adelpour, Mojtaba Sadeghi

In this work, we present a novel compact plasmonic dual-band bandpass filter based on graphene nanoribbons, tunable through azo-dye-doped liquid crystal and graphene conductivity. Graphene nanoribbons are deposited on a silica substrate and covered with azo-dye-doped liquid crystal. Therefore, the performance of the plasmonic structure can be tuned by a laser pump and the graphene chemical potential. Full-wave simulations are performed in COMSOL Multiphysics using the Finite Element Method (FEM). In addition, Transmission Line Modelling and Electromagnetic Scaling Law are used to validate the numerical simulation results. The proposed filter resonates at 2.45 THz and 9.2 THz when the laser pump is off. However, when the laser pump is on, the resonant frequencies redshift to 2.3 THz and 8.6 THz. The corresponding quality factors are 20 and 31 for the lower and higher resonance frequencies when the laser pump is off. The simulated reflection coefficients (S₁₁) reach −31 dB and −38 dB for the two passbands confirming efficient transmission (S₂₁≈ 0 dB). The effect of graphene chemical potential and geometric variations on our structure is investigated. Finally, the size and performance of our filter are compared with the previously reported designs, demonstrating both practical feasibility and compactness. With a compact footprint of 420 × 350 nm² and dual-band tunability, the proposed filter is a promising candidate for terahertz sensing and communication systems.

在这项工作中，我们提出了一种基于石墨烯纳米带的新型紧凑等离子体双带带通滤波器，可通过偶氮染料掺杂液晶和石墨烯电导率进行调谐。石墨烯纳米带沉积在二氧化硅衬底上，并覆盖有偶氮染料掺杂液晶。因此，等离子体结构的性能可以通过激光泵浦和石墨烯的化学势来调节。利用有限元法在COMSOL Multiphysics中进行了全波模拟。此外，采用传输线模型和电磁标度法对数值模拟结果进行了验证。当激光泵浦关闭时，所提出的滤波器谐振在2.45 太赫兹和9.2 太赫兹。然而，当激光泵浦打开时，谐振频率红移到2.3 太赫兹和8.6 太赫兹。当激光泵浦关闭时，低共振频率和高共振频率对应的质量因子分别为20和31。两个波段（S₁₁≈0 dB）的模拟反射系数（S₁₁≈0 dB）分别达到−31 dB和−38 dB。研究了石墨烯化学势和几何变化对我们结构的影响。最后，将该滤波器的尺寸和性能与先前报道的设计进行了比较，证明了该滤波器的实际可行性和紧凑性。该滤波器具有420 × 350 nm2的紧凑尺寸和双带可调谐性，是太赫兹传感和通信系统的理想候选滤波器。

{"title":"The design and TLM analysis of a compact graphene-based dual-band bandpass plasmonic filter with hybrid post-fabrication tunability via liquid crystal in the terahertz regime","authors":"Iman Razmkhah, Zahra Adelpour, Mojtaba Sadeghi","doi":"10.1016/j.ijleo.2025.172610","DOIUrl":"10.1016/j.ijleo.2025.172610","url":null,"abstract":"<div><div>In this work, we present a novel compact plasmonic dual-band bandpass filter based on graphene nanoribbons, tunable through azo-dye-doped liquid crystal and graphene conductivity. Graphene nanoribbons are deposited on a silica substrate and covered with azo-dye-doped liquid crystal. Therefore, the performance of the plasmonic structure can be tuned by a laser pump and the graphene chemical potential. Full-wave simulations are performed in COMSOL Multiphysics using the Finite Element Method (FEM). In addition, Transmission Line Modelling and Electromagnetic Scaling Law are used to validate the numerical simulation results. The proposed filter resonates at 2.45 THz and 9.2 THz when the laser pump is off. However, when the laser pump is on, the resonant frequencies redshift to 2.3 THz and 8.6 THz. The corresponding quality factors are 20 and 31 for the lower and higher resonance frequencies when the laser pump is off. The simulated reflection coefficients (S₁₁) reach −31 dB and −38 dB for the two passbands confirming efficient transmission (S₂₁≈ 0 dB). The effect of graphene chemical potential and geometric variations on our structure is investigated. Finally, the size and performance of our filter are compared with the previously reported designs, demonstrating both practical feasibility and compactness. With a compact footprint of 420 × 350 nm<sup>2</sup> and dual-band tunability, the proposed filter is a promising candidate for terahertz sensing and communication systems.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"345 ","pages":"Article 172610"},"PeriodicalIF":3.1,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to “A novel PCF-based optical sensor: Design and modeling for early malaria detection” [Optik 342–343, December 2025, 172581] “基于pcf的新型光学传感器：早期疟疾检测的设计和建模”的勘误表[Optik 342-343， December 2025, 172581]

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-19 DOI: 10.1016/j.ijleo.2025.172604

Sanjeev Mani Yadav

引用次数: 0

Comprehensive review on 2D nanomaterial-based fiber optic sensor for human breath monitoring application 基于二维纳米材料的光纤传感器在人体呼吸监测中的应用综述

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-17 DOI: 10.1016/j.ijleo.2025.172603

Kishore Kumar Venkatesan , Sathiyan Samikannu

The design, fabrication, and development of smart sensors are among the ultimate challenges faced by researchers nowadays in intelligent and real-time monitoring systems. A system for monitoring human breath holds exceptional promise in harsh environments, healthcare, sports, and remote monitoring. Translating this into the real world will be quite challenging as it requires developing unobtrusive and comfortable systems while maintaining high metrological performance. The potential solution for this has been derived from fiber optic sensors due to their compact size, ability to handle multiple inputs, chemical stability, and immunity to electromagnetic (EM) interference. Inclusive of this, a 2D nanomaterial is coated on an optical fiber and used as a sensing medium which detects changes in the breath composition and provides valuable information about the respiratory system because of its high surface-to-volume ratio, high carrier mobility, tunable band gaps, and strong light-matter interactions. This approach can potentially revolutionize the field of breath monitoring, enabling early detection of respiratory diseases and improving patient outcomes. Thus, this system will provide a pathway for exploring new possibilities in the emerging 2D material-based sensing platform. Here, we overview recent developments for monitoring human breath with fiber optic sensors and nanomaterial-based FOS along with various methods of respiratory monitoring and their benefits in real-time monitoring. Also, we summarize the challenges and future perspectives of 2D layered nanomaterial-based fiber optic sensors for human breath monitoring applications.

智能传感器的设计、制造和开发是当今智能实时监控系统研究人员面临的终极挑战之一。监测人体呼吸的系统在恶劣环境、医疗保健、体育和远程监测中具有特殊的前景。将其转化为现实世界将是相当具有挑战性的，因为它需要在保持高计量性能的同时开发不显眼和舒适的系统。光纤传感器的潜在解决方案源于其紧凑的尺寸、处理多输入的能力、化学稳定性和对电磁（EM）干扰的免疫力。包括这一点，二维纳米材料被涂在光纤上，用作检测呼吸成分变化的传感介质，并提供有关呼吸系统的有价值的信息，因为它具有高表面体积比、高载流子迁移率、可调带隙和强光-物质相互作用。这种方法可能会彻底改变呼吸监测领域，使呼吸系统疾病的早期检测成为可能，并改善患者的预后。因此，该系统将为探索新兴的基于二维材料的传感平台的新可能性提供途径。本文概述了利用光纤传感器和基于纳米材料的FOS监测人体呼吸的最新进展，以及各种呼吸监测方法及其在实时监测中的益处。此外，我们还总结了用于人体呼吸监测的二维层状纳米材料光纤传感器的挑战和未来前景。

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引用次数: 0

Mitigation optical losses via plasmonic core/shell (Co/Gr) nanoparticles introduced in ultra-thin film silicon solar cell 超薄膜硅太阳能电池中引入等离子体核/壳（Co/Gr）纳米粒子降低光学损耗

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-17 DOI: 10.1016/j.ijleo.2025.172602

Rusul A. Dahab, Hussein A. Jawad

Optical losses represent one of the primary obstacles to increasing the efficiency of silicon solar cells. The recommended solution to minimize optical losses is the use of plasmonic metal nanoparticles; however, they act as recombination centers within the solar cell construction, leading to a decrease in performance. The goal of this article is to introduce cobalt/graphene nanoparticles into the solar cell to minimize the optical losses. An ultra-thin film silicon PIN solar cell of dimensions (400 ×400 ×900) nm³ with ring metal contact shape was designed and numerically investigated using COMSOL Multiphysics software version 6.2 by the finite element method (FEM). Core/shell cobalt-graphene (Co/Gr) nanoparticles are periodically introduced into the cell between two layers (electron transport and active) in a ratio of 50:50 with an inter-spacing of a similar diameter. The Co/Gr parameters, number of nanoparticles (2, 4, 6), radius (10, 20, 30) nm, and shell thickness (1, 2, 4) nm were extensively studied. In addition, the arrangement of the core/shell nanoparticle material was considered. The results manifest the best performance of the proposed cell at 4 nanoparticles of 30 nm radius with 2 nm shell thickness for Co/Gr nanoparticles to get a maximum photocurrent of 26.28 mA/cm². It is concluded that the optical losses of the Co/Gr core/shell nanoparticles embedded in an ultra-thin film silicon solar cell are significantly reduced owing to the increment in the absorption and hence the photocurrent. This enhancement opens a new avenue for further improvements.

光学损耗是提高硅太阳能电池效率的主要障碍之一。减少光学损耗的建议解决方案是使用等离子体金属纳米粒子；然而，它们在太阳能电池结构中充当重组中心，导致性能下降。本文的目标是将钴/石墨烯纳米颗粒引入太阳能电池，以最大限度地减少光学损耗。采用COMSOL Multiphysics软件6.2，设计了尺寸为（400 ×400 ×900） nm3的环形金属接触形状的超薄硅PIN太阳电池，并采用有限元方法对其进行了数值模拟。芯/壳钴-石墨烯（Co/Gr）纳米颗粒以50:50的比例周期性地引入电池两层（电子传递层和活性层）之间，间距直径相似。对Co/Gr参数、纳米颗粒数量（2,4,6）、半径（10,20,30）nm和壳厚度（1,2,4）nm进行了广泛的研究。此外，还考虑了核/壳纳米颗粒材料的排列方式。结果表明，当Co/Gr纳米颗粒半径为30 nm，壳厚为2 nm时，电池性能最佳，最大光电流为26.28 mA/cm2。研究结果表明，Co/Gr核/壳纳米粒子嵌入超薄膜硅太阳能电池中，由于吸收的增加和光电流的增加，光学损耗显著降低。这一增强为进一步改进开辟了新的途径。

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引用次数: 0

Photoinduced birefringence studies in CuO doped Pb3O4-Bi2O3-B2O3 glass ceramics using femtosecond laser 用飞秒激光研究CuO掺杂Pb3O4-Bi2O3-B2O3玻璃陶瓷的光致双折射

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-13 DOI: 10.1016/j.ijleo.2025.172600

D. Bhadrarao , P. Rakus , A. Venkata Sekhar , V. Chitti Babu , Y. Dana Rao , V. Ravi Kumar , G. Naga Raju , N. Purnachand , N. Venkatramaiah , N. Veeraiah

In this investigation, photo-induced birefringence of Pb₃O₄-Bi₂O₃-B₂O₃ glass ceramics doped with varying content of CuO (ranging from 0.2 to 1.0 mol%) is presented. The photo-induced birefringence (PIB) exhibited a delayed relaxation process lasting few seconds and indicated that the anisotropic photorefractive (PR) effect significantly exceeded the fast Kerr effect. Photorefractive birefringence reached a maximum at a CuO concentration of 0.2 mol%, likely due to enhanced depolymerization of the glass ceramic network that reduces the phonon losses. This is ascribed to the predominant fraction of Cu^2 + ions occupying octahedral (O_h) sites and acting as modifiers. Increasing the CuO content further, up to nearly 0.8 mol%, the magnitude of photorefractive birefringence is observed to reduce. Phonon losses increase because a higher proportion of Cu⁺ ions occupy tetrahedral (T_d) positions within the glass ceramic in this concentration range, resulting in stronger interactions between different structural groups in the material. Electrical conductivity and ultrasonic measurements corroborate this finding. Additionally, these glass ceramics were found to be composed of anisotropic CuBi₂O₄ crystal phases, which enhance their photorefractive (PR) properties. Notably, compositions containing approximately 0.2 mol% CuO demonstrate optimal PR efficiency and are promising candidates for practical applications.

本文研究了掺杂不同CuO含量（0.2 ~ 1.0 mol%）的Pb3O4-Bi2O3-B2O3玻璃陶瓷的光致双折射。光致双折射（PIB）表现出持续数秒的延迟弛豫过程，表明各向异性光折变（PR）效应明显超过快速Kerr效应。光折变双折射在CuO浓度为0.2 mol%时达到最大值，这可能是由于玻璃陶瓷网络的解聚增强，减少了声子损失。这是由于Cu2 +离子占据八面体（Oh）位点并作为修饰剂的主要部分。进一步增加CuO含量，接近0.8 mol%时，光折变双折射幅度减小。在此浓度范围内，由于较高比例的Cu+离子占据玻璃陶瓷内的四面体（Td）位置，导致材料中不同结构基团之间的相互作用更强，声子损失增加。电导率和超声波测量证实了这一发现。此外，发现这些玻璃陶瓷由各向异性CuBi2O4晶相组成，这提高了它们的光折变（PR）性能。值得注意的是，含有约0.2 mol% CuO的组合物显示出最佳的PR效率，并且是实际应用的有希望的候选物。

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引用次数: 0

Generation of pulse bursts and broadband spectrum in a hundred-meter-long Yb-doped fiber laser 百米长掺镱光纤激光器中脉冲爆发和宽带频谱的产生

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2025-11-13 DOI: 10.1016/j.ijleo.2025.172599

Dongxin Gao , Minghui Sun , Yunli Yu , Wenyu Wang , Weixin Liu , Yuzhai Pan

We report an experimental investigation into the generation and control of multi-pulse bursts in a passively mode-locked Yb-doped fiber laser based on nonlinear polarization rotation (NPR). By systematically adjusting the polarization controller (PC) at a fixed pump power, we successfully realize controllable pulse bursts with varying pulse numbers and intervals. Notably, distinct pulse interval distributions are observed in the output configurations ranging from 1 to 5 pulses. Additionally, a broadband spectrum with a 20 dB bandwidth extending up to 66 nm is achieved, attributed to the interplay between Raman scattering and polarization state modulation within the laser cavity. These findings demonstrate the potential for precise pulse control and broad spectral generation in NPR based fiber lasers.

本文报道了一种基于非线性偏振旋转（NPR）的被动锁模掺镱光纤激光器中多脉冲爆发的产生和控制的实验研究。在固定的泵浦功率下，通过系统调节偏振控制器（PC），成功地实现了可变脉冲数和间隔的可控脉冲爆发。值得注意的是，在1到5个脉冲的输出配置中观察到不同的脉冲间隔分布。此外，由于激光腔内拉曼散射和偏振态调制之间的相互作用，实现了带宽为20 dB的宽带频谱，延伸至66 nm。这些发现证明了在基于NPR的光纤激光器中实现精确脉冲控制和广谱产生的潜力。

引用次数: 0

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