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Recent advances for diode-pumped CW Pr:YLF lasers in power scaling at different wavelengths 二极管泵浦 CW Pr:YLF 激光器在不同波长功率扩展方面的最新进展
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105578
Lei Huang , Xuesen Xu , Nana Zhang , Minyue Yuan , Sen Qiu , Kuan Ye , Wu Pan , Renpu Li , Yongrui Guo
Visible lasers based on blue laser diodes (LDs) pumped trivalent rare-earth ions doped crystal have recently attracted growing attention due to their advantages of high-efficiency, compact structure, and low cost, having wide applications in the fields of laser displays, biomedicine, material processing and so on. Pr:YLF lasers have been widely researched and further developed for the excellent spectral characteristics of Pr:YLF crystals. Specifically, LD-pumped continuous-wave (CW) Pr:YLF lasers have attained significant progress in lasing output performance, including output power scaling, emission wavelength expansion, and output mode diversification with the maturity of blue LDs. This paper mainly reviews the recent research progress on output performance improvement and provides insights into the further development trend of LD-pumped CW Pr:YLF lasers, aiming to provide a useful reference for the development of LD-pumped CW Pr:YLF lasers in the future.
基于蓝色激光二极管(LDs)泵浦的三价稀土离子掺杂晶体的可见光激光器因其高效率、结构紧凑、成本低廉等优点而受到越来越多的关注,在激光显示、生物医学、材料加工等领域有着广泛的应用。由于 Pr:YLF 晶体具有优异的光谱特性,Pr:YLF 激光器得到了广泛的研究和进一步发展。具体而言,随着蓝光 LD 的成熟,LD 泵浦连续波(CW)Pr:YLF 激光器在激光输出性能方面取得了重大进展,包括输出功率扩展、发射波长扩展和输出模式多样化。本文主要回顾了近年来在提高输出性能方面的研究进展,并对 LD 泵浦 CW Pr:YLF 激光器的进一步发展趋势提出了见解,旨在为未来 LD 泵浦 CW Pr:YLF 激光器的发展提供有益的参考。
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引用次数: 0
Quantitatively characterization of rare earth ore by terahertz time-domain spectroscopy 利用太赫兹时域光谱对稀土矿进行定量表征
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105587
Tong Zhang , Zhiyuan Zheng , Mingrui Zhang , Shanshan Li , Xiaodi Zheng , Haochong Huang , Junfeng Shen , Zili Zhang , Kunfeng Qiu
The Bayan Obo deposit is the world’s largest polymetallic associated minerals deposit of rare earths, iron and niobium, and the rarity of its physical properties restrict the knowledge and understanding of its laws. Taking the high-grade mixed rare earth concentrate of Bayan Obo as the research object, terahertz time-domain spectroscopy (THz-TDS) has been adopted for the systematic investigation of high-grade rare earth concentrate base on the traditional X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric-differential thermal analysis (TG-DTA). The absorption coefficient and refractive index of high-grade rare earth ores and their associated minerals of fluorite and dolomite, are all investigated by terahertz time-domain spectroscopy. The terahertz spectral response is affected by the type of mineral and its content. The acquired rare earth terahertz spectral data are processed by correlation analysis. Three machine learning algorithms, Partial Least Squares Regression (PLSR), Random forest (RF) and Multilayer Perceptron (MLP), are used to achieve quantitative detection of their concentrations and components with the coefficient of determination R2 of the absorption coefficient of the optical parameter reaching up to 0.975, 0.992 and 0.984, respectively. This work promotes the growing understanding of terahertz transmission spectroscopy of rare earth-bearing minerals, which can be used to help guide the search for minerals, and to detect, identify as well as quantify them in geology. Terahertz time-domain spectroscopy supplies a new method for study of rare earth resources, and the comprehensive development and utilization of resources in the Bayan Obo deposit.
巴彦奥博矿床是世界上最大的稀土、铁和铌多金属伴生矿床,其物理性质的稀有性限制了人们对其规律的认识和理解。以巴彦奥博高品位混合稀土精矿为研究对象,在传统的 X 射线荧光(XRF)、X 射线衍射(XRD)、扫描电子显微镜(SEM)和热重-差热分析(TG-DTA)的基础上,采用太赫兹时域光谱(THz-TDS)对高品位稀土精矿进行了系统研究。太赫兹时域光谱法研究了高品位稀土矿及其伴生矿物萤石和白云石的吸收系数和折射率。太赫兹光谱响应受矿物类型及其含量的影响。获取的稀土太赫兹光谱数据经过相关分析处理。利用三种机器学习算法,即部分最小二乘法回归(PLSR)、随机森林(RF)和多层感知器(MLP),实现了对其浓度和成分的定量检测,光学参数吸收系数的判定系数 R2 分别达到 0.975、0.992 和 0.984。这项工作促进了人们对含稀土矿物太赫兹透射光谱学的进一步了解,可用于指导寻找矿物,以及在地质学中探测、识别和量化矿物。太赫兹时域光谱学为研究稀土资源和巴彦奥博矿床资源的综合开发利用提供了一种新方法。
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引用次数: 0
Single layered Ag/NiO plasmonic nanocoatings: A new green synthesis method for selective solar absorber 单层 Ag/NiO 等离子纳米涂层:用于选择性太阳能吸收器的新型绿色合成方法
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105588
H.G. Gebretinsae , M.G. Tsegay , G.G. Welegergs , H.E. Mohamed , M. Maaza , Z.Y. Nuru
This study presents the synthesis of environmentally benign, single-layered spectrally selective Ag/NiO nanocoating absorbers using a green synthesis method. Various characterization techniques, including Rutherford backscattering spectroscopy (RBS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM), were used to examine the effects of plasmonic Ag concentration on the structural, chemical composition, and surface morphology of the nanocomposites. The optical properties of the deposited nanocoatings were investigated using a UV–Vis-NIR spectrophotometer in the solar spectrum region (300–2500 nm) and an FT-IR spectrophotometer in the infrared wavelength region (3000–20,000 nm). XRD results confirmed the coexistence of a face-centered cubic phase of Ag and NiO in the Ag/NiO nanocermet thin films. SEM and TEM topography revealed uniformly distributed nanosphere NiO thin films and cubic Ag metal with better dispersibility and crystallization. The RBS spectrum of the samples showed a homogeneous distribution of Ni, Ag, and O atoms throughout the coatings. Ag/NiO nanocoatings deposited with 8 wt% Ag content exhibited excellent solar absorptance (α) = 0.95 and thermal emittance of (ɛ) of 0.08. This enhancement is primarily attributed to the localized surface plasmon resonance (LSPR) effect associated with the embedded Ag nanoparticles, which facilitates more effective utilization of light.
本研究采用绿色合成方法合成了对环境无害的单层光谱选择性 Ag/NiO 纳米涂层吸收器。研究采用了多种表征技术,包括卢瑟福反向散射光谱(RBS)、X 射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和原子力显微镜(AFM),考察了质子银浓度对纳米复合材料结构、化学成分和表面形态的影响。使用紫外-可见-近红外分光光度计在太阳光谱区(300-2500 nm)和傅立叶变换红外分光光度计在红外波长区(3000-20000 nm)研究了沉积纳米涂层的光学特性。XRD 结果证实,在 Ag/NiO 纳米金属薄膜中,Ag 和 NiO 的面心立方相共存。扫描电子显微镜(SEM)和电子显微镜(TEM)形貌图显示,纳米氧化镍薄膜和立方银金属分布均匀,具有更好的分散性和结晶性。样品的 RBS 光谱显示,Ni、Ag 和 O 原子在整个涂层中均匀分布。Ag/NiO 纳米涂层中的 Ag 含量为 8 wt%,具有出色的太阳能吸收率 (α) = 0.95 和热辐射率 (ɛ) 0.08。这种增强主要归因于与嵌入的银纳米粒子相关的局部表面等离子体共振(LSPR)效应,它有助于更有效地利用光。
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引用次数: 0
Optical properties of crystals and two-phase ceramics of the AgCl0.25Br0.75 – AgI system AgCl0.25Br0.75 - AgI 系统晶体和两相陶瓷的光学特性
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105586
Anastasia Yuzhakova, Alexander Lvov, Dmitrii Salimgareev, Polina Pestereva, Alexandra Schukina, Ivan Yuzhakov, Alexander Korsakov, Liya Zhukova
Research of materials’ optical properties is critical for further development and manufacturing of optical products. While recently, single crystals and two-phase ceramics of the AgCl0.25Br0.75 – AgI system have been developed by the authors. This work is focused on studying the transmission ranges, refractive index dispersion, optical losses, and photoresistance of materials in the AgCl0.25Br0.75 – AgI system, as well as comparing the properties of single-crystals and ceramics. The materials are transparent in the visible and IR regions from 0.49 to 54 um, as well as in the terahertz (far IR and millimeter regions) of 300–1500 um (0.3–1.0 THz). For all compositions, the refractive index in the IR varied from 2.107 to 2.436. The materials’ absorption coefficients were (0.06–6.67) ∙ 10-4 in the middle IR, which is lower compared to other halide materials known and indicates low optical loss. Finally, both single-crystals and two-phase ceramics showed a trend towards an increase in photoresistance with a rise of the AgI content in the AgCl0.25Br0.75 solid solution. After UV irradiation, the materials showed a decrease in transmission in the visible and middle IR (to 10 µm) with negligible loss at a wavelength of 10 µm or more. For a single crystal and two samples of ceramics with a composition of 20 mol. % AgI in AgCl0.25Br0.75, a comparison of properties was conducted in this study. Based on the comparison results, close but not identical values of the refractive indices, an increase in the absorption coefficient for ceramic materials, and a low photoresistance of the sample obtained from the mechanical mixture were revealed. The last two characteristics are associated with the high heterogeneity of two-phase ceramics based on a mechanical mixture, which leads to a deterioration in functional properties. These results prove high prospects for the use of these materials in fiber optics and photonics for medical technologies, thermography, and optoelectronics.
研究材料的光学特性对于进一步开发和制造光学产品至关重要。最近,作者开发出了 AgCl0.25Br0.75 - AgI 系统的单晶体和两相陶瓷。这项工作的重点是研究 AgCl0.25Br0.75 - AgI 体系材料的透射范围、折射率色散、光学损耗和光阻,并比较单晶体和陶瓷的特性。这些材料在 0.49 至 54 um 的可见光和红外区域以及 300-1500 um(0.3-1.0 THz)的太赫兹(远红外和毫米波区域)范围内都是透明的。对于所有成分,红外折射率在 2.107 至 2.436 之间变化。材料在中红外的吸收系数为 (0.06-6.67) ∙ 10-4,与已知的其他卤化物材料相比较低,表明其光学损耗较低。最后,随着 AgCl0.25Br0.75 固溶体中 AgI 含量的增加,单晶和两相陶瓷的光阻都呈上升趋势。紫外线照射后,材料在可见光和中红外(10 µm)波段的透射率下降,而在 10 µm 或以上波段的透射率损失可以忽略不计。本研究对 AgCl0.25Br0.75 中 AgI 含量为 20 摩尔%的单晶体和两个陶瓷样品的特性进行了比较。比较结果表明,陶瓷材料的折射率值接近但不完全相同,陶瓷材料的吸收系数增大,机械混合物样品的光阻较低。后两个特征与基于机械混合物的两相陶瓷的高异质性有关,这导致了功能特性的恶化。这些结果证明,这些材料在医疗技术、热成像技术和光电子技术的光纤和光子学领域具有广阔的应用前景。
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引用次数: 0
Experience-based noise model of infrared detectors for system dimensioning and simulation 基于经验的红外探测器噪声模型,用于系统尺寸确定和模拟
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105589
Alain Kattnig, Christian Musso
We show that infrared detectors frequently exhibit non-Gaussian spatial noise, which makes it difficult to compare their performance. The power-law-like behavior we show can be very detrimental to certain detection missions, hence the need to characterize this noise. We demonstrate that a simple mixture of Gaussian and Student processes corresponds to the observed example, and that the parameter determination procedure described here reaches its theoretical limit.
我们的研究表明,红外探测器经常表现出非高斯空间噪声,这使得比较它们的性能变得十分困难。我们展示的幂律行为可能对某些探测任务非常不利,因此有必要描述这种噪声的特征。我们证明,高斯过程和学生过程的简单混合物与观测到的例子相符,这里描述的参数确定程序达到了理论极限。
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引用次数: 0
A composite laser ablation diagnosis method based on multiple spectroscopic and imaging analyses 基于多重光谱和成像分析的复合激光烧蚀诊断方法
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-09 DOI: 10.1016/j.infrared.2024.105585
Jiamin Wang , Yunfeng Zhang , Changbin Zheng , Kuo Zhang , Junfeng Shao , Chunrui Wang , Yunzhe Wang , Fei Chen
This study proposes a novel diagnostic approach for target ablation to comprehensively elucidate the physical mechanisms of laser ablation in aluminium alloys and stainless steel, precisely measure sample temperatures, and predict the ablation state. The method utilizes a spatially weighted emissivity model in conjunction with multispectral thermometry techniques to analyze spatial variations in temperature and emissivity distributions, facilitating the evaluation of target ablation status. Through a series of experiments, temperature data obtained using an enhanced weighted radiative spectral inversion technique were compared with temperatures recorded by thermal imaging cameras, confirming the effectiveness and accuracy of the weighted radiative spectral inversion method in multispectral thermometry. Additionally, a detailed examination of laser ablation in aluminium alloys and stainless steel was conducted to elucidate the underlying damage mechanisms. This refined approach establishes a solid groundwork for further investigation into the characteristics and dynamic Evolution of laser-damaged regions.
本研究提出了一种新的目标烧蚀诊断方法,以全面阐明铝合金和不锈钢激光烧蚀的物理机制,精确测量样品温度,并预测烧蚀状态。该方法利用空间加权发射率模型,结合多光谱测温技术,分析温度和发射率分布的空间变化,便于评估目标烧蚀状态。通过一系列实验,将使用增强型加权辐射光谱反演技术获得的温度数据与热像仪记录的温度进行了比较,证实了加权辐射光谱反演法在多光谱测温中的有效性和准确性。此外,还对铝合金和不锈钢的激光烧蚀进行了详细研究,以阐明潜在的破坏机制。这种完善的方法为进一步研究激光损伤区域的特征和动态演变奠定了坚实的基础。
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引用次数: 0
Non-destructive detection of male and female information in ducklings based on near-infrared spectral wavelength selection and deep learning 基于近红外光谱波长选择和深度学习的鸭苗雌雄信息非破坏性检测
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-05 DOI: 10.1016/j.infrared.2024.105583
Dengfei Jie , Jing Yang , Jincheng He , Jinxin Lin , Xuan Wei
The technology for sex identification in ducklings can contribute to increased revenue and cost savings in modern duck farming. However, traditional manual identification techniques require high skill levels and involve significant labor intensity. In this study, a non-destructive, user-friendly, and efficient duckling sex identification technique was proposed using near-infrared spectroscopy and deep learning algorithms. Spectral data from 600 groups of newly hatched ducklings were collected. These data were divided into training, testing, and validation sets in a ratio of 7:2:1. The raw spectral data was preprocessed using the Savitzky-Golay convolution derivative method, which was employed for subsequent spectral feature wavelength extraction and modeling. The characteristic wavelengths were extracted using competitive adaptive reweighted sampling (CARS), successive projections algorithm (SPA), and uninformative variable elimination combined with SPA (UVE-SPA). Conventional machine learning methods − support vector machine (SVM) and different deep learning models, including multilayer perceptron (MLP), mobile network version 2 (MobileNetV2), and residual neural network (ResNet), were studied and compared. The experiment showed that deep learning algorithms outperform traditional spectral analysis models in terms of classification performance. Furthermore, conducting feature wavelength extraction before constructing the classification model could reduce the model’s testing time and even improve its classification performance. Finally, the four models with better classification performance were validated using a validation set, and the combination of MobileNetV2 model UVE-SPA was selected as the optimized model for ducklings’ gender determination, with a classification accuracy of 98.3 % and an average validation time of 1.1 ms. In summary, the detection model established using near-infrared spectroscopy and MobileNetV2 can achieve non-destructive identification of the gender of ducklings. The findings can provide a preliminary research foundation and technical support for the subsequent design of related online intelligent detection systems.
雏鸭性别鉴定技术有助于现代养鸭业增加收入和节约成本。然而,传统的人工鉴定技术需要较高的技术水平,劳动强度大。本研究利用近红外光谱和深度学习算法,提出了一种非破坏性、用户友好和高效的雏鸭性别鉴定技术。研究收集了 600 组新孵化小鸭的光谱数据。这些数据按 7:2:1 的比例分为训练集、测试集和验证集。使用萨维茨基-戈莱卷积导数法对原始光谱数据进行预处理,用于随后的光谱特征波长提取和建模。特征波长的提取采用了竞争性自适应再加权采样(CARS)、连续投影算法(SPA)和结合 SPA 的无信息变量消除法(UVE-SPA)。研究并比较了传统的机器学习方法--支持向量机(SVM)和不同的深度学习模型,包括多层感知器(MLP)、移动网络版本 2(MobileNetV2)和残差神经网络(ResNet)。实验结果表明,深度学习算法的分类性能优于传统的光谱分析模型。此外,在构建分类模型之前进行特征波长提取可以减少模型的测试时间,甚至提高分类性能。最后,利用验证集对分类性能较好的四个模型进行了验证,最终选择 MobileNetV2 模型 UVE-SPA 组合作为小鸭性别鉴定的优化模型,其分类准确率为 98.3%,平均验证时间为 1.1 ms。综上所述,利用近红外光谱和 MobileNetV2 建立的检测模型可以实现对小鸭性别的无损识别。该研究结果可为后续相关在线智能检测系统的设计提供初步研究基础和技术支持。
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引用次数: 0
Er3+/Tm3+ codoped CaF2 based oxyfluoroborosilicate glass-ceramics for fiber laser applications 用于光纤激光应用的 Er3+/Tm3+ 共掺 CaF2 氧氟硼硅酸盐玻璃陶瓷
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-05 DOI: 10.1016/j.infrared.2024.105571
Bungala Chinna Jamalaiah
Transparent Er3+/Tm3+ codoped CaF2 based oxyfluoroborosilicate glass-ceramics (BSEr1TmxGCs) with variable Tm3+ concentration were prepared through melt quench process followed by reheat treatment at 450 °C/1h. They were characterized through differential scanning calorimetry (DSC), powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) Raman spectroscopy, near infrared (NIR) emission and luminescence decay. The formation of CaF2 nanocrystallites against oxyfluoroborosilicate glassy phase was confirmed by scanning electron microscopic (SEM) and hi-resolution transmission electron microscopic (HRTEM) studies. The NIR emission properties were investigated at 460 nm diode laser pumping. The applicability of BSEr1TmxGCs were examined by evaluating effective bandwidth (Δλeff), stimulated emission cross-section (σe), gain bandwidth (σe × Δλeff), figure of merit (σe × τR) and quantum efficiency (ηQE). The energy transfer efficiency (ηET), rate of energy transfer (WET) between Er3+ and Tm3+ and the rate of non-radiative transitions (WNR) were also calculated. The comparative NIR emission performance suggests that the BSEr1Tm1GC has proficiency for 1530 nm broadband fiber lasers and optical amplifiers in short wavelength and conventional wavelength (S + C) band communication window.
通过熔体淬火工艺制备了透明的 Er3+/Tm3+ 共掺 CaF2 氧氟硼硅酸盐玻璃陶瓷(BSEr1TmxGCs),Tm3+ 浓度可变,然后在 450 °C/1h 下重新加热处理。通过差示扫描量热法(DSC)、粉末 X 射线衍射(XRD)、傅立叶变换红外(FTIR)拉曼光谱、近红外(NIR)发射和发光衰减对它们进行了表征。扫描电子显微镜(SEM)和高分辨率透射电子显微镜(HRTEM)研究证实了氧氟硼硅玻璃相中 CaF2 纳米晶粒的形成。在 460 纳米二极管激光泵浦条件下,对近红外发射特性进行了研究。通过评估有效带宽(Δλeff)、受激发射截面(σe)、增益带宽(σe × Δλeff)、优点系数(σe × τR)和量子效率(ηQE),考察了 BSEr1TmxGCs 的适用性。此外,还计算了 Er3+ 和 Tm3+ 之间的能量传递效率 (ηET)、能量传递率 (WET) 以及非辐射跃迁率 (WNR)。近红外发射性能比较表明,BSEr1Tm1GC 可用于 1530 nm 宽带光纤激光器以及短波长和传统波长(S + C)波段通信窗口的光放大器。
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引用次数: 0
E2TNet: Efficient enhancement Transformer network for hyperspectral image classification E2TNet:用于高光谱图像分类的高效增强变换器网络
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-05 DOI: 10.1016/j.infrared.2024.105569
Yunji Zhao, Wenming Bao, Xiaozhuo Xu, Yuhang Zhou
Recently, Convolutional Transformer-based models have become popular in hyperspectral image (HSI) classification tasks and gained competitive classification performance. However, some Convolutional Transformer-based models fail to effectively mine the global correlations of coarse-grained and fine-grained features, which is adverse to recognizing the refined scale variation information of land-cover. The combination of convolution operations and multihead self-attention mechanisms also increases the computational cost, leading to low classification efficiency. In addition, shallow spectral–spatial features are directly input into the encoder, which inevitably incurs redundant spectral information. Therefore, this paper proposes an efficient enhancement Transformer network (E2TNet) for HSI classification. Specifically, this paper first designs a spectral–spatial feature fusion module to extract spectral and spatial features from HSI cubes and fuse them. Second, considering that redundant spectral information has a negative impact on classification performance, this paper designs a spectral–spatial feature weighted module to improve the feature representation of critical spectral information. Finally, to explore the global correlations of coarse-grained and fine-grained features and improve classification efficiency, an efficient multigranularity information fusion module is embedded in the encoder of E2TNet. The experiment is conducted on four benchmark hyperspectral datasets, and the experimental results demonstrate that the proposed E2TNet is better than several Convolutional Transformer-based classification models in terms of classification accuracy and classification efficiency.
最近,基于卷积变换器的模型在高光谱图像(HSI)分类任务中开始流行,并获得了具有竞争力的分类性能。然而,一些基于卷积变换器的模型无法有效挖掘粗粒度和细粒度特征的全局相关性,不利于识别土地覆盖的精细尺度变化信息。卷积运算与多头自关注机制的结合也增加了计算成本,导致分类效率低下。此外,浅层光谱空间特征直接输入编码器,不可避免地会产生冗余光谱信息。因此,本文提出了一种用于人机交互分类的高效增强变换器网络(E2TNet)。具体来说,本文首先设计了一个光谱-空间特征融合模块,从 HSI 立方体中提取光谱和空间特征并进行融合。其次,考虑到冗余光谱信息会对分类性能产生负面影响,本文设计了光谱-空间特征加权模块,以改进关键光谱信息的特征表示。最后,为了探索粗粒度和细粒度特征的全局相关性并提高分类效率,本文在 E2TNet 编码器中嵌入了高效的多粒度信息融合模块。实验在四个基准高光谱数据集上进行,实验结果表明,所提出的 E2TNet 在分类精度和分类效率方面都优于几个基于卷积变换器的分类模型。
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引用次数: 0
Intelligent controllable ultrafast fiber laser via deep learning and adaptive optimization algorithm 通过深度学习和自适应优化算法实现智能可控超快光纤激光器
IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Pub Date : 2024-10-04 DOI: 10.1016/j.infrared.2024.105572
Chuhui Zhang , Pengfei Xiang , Wei Zhu , Chen Chen , Xueming Liu
Ultrafast fiber lasers based on nonlinear polarization rotation can generate femtosecond pulses with different pulse durations and high peak powers, which are powerful tools for engineering applications and scientific research. However, achieving a precise and repeatable polarization state for generating the ultrashort pulses with the shortest pulse duration remains a significant challenge. In this paper, we extend the use of recurrent neural networks and adaptive optimization algorithms, specifically designed to optimize repetitive processes in optical systems, to facilitate intelligent search and control aimed at achieving the minimum pulse duration within a mode-locked fiber laser cavity. Our multi-algorithm-based intelligent system can fully simulate and optimize the processes involved in hands-on experiments. Our intelligent system identified a mode-locked fiber laser with the shortest pulse duration of 465 fs, which was experimentally verified. The proposed intelligent algorithm not only identifies the shortest pulse but also holds significant potential for selecting related laser characteristic parameters. We believe this work opens up a novel avenue for exploration and optimization in mode-locked lasers and the intelligent laser can find practical applications in engineering and scientific research.
基于非线性偏振旋转的超快光纤激光器可产生具有不同脉冲持续时间和高峰值功率的飞秒脉冲,是工程应用和科学研究的有力工具。然而,实现精确且可重复的偏振态以产生脉冲持续时间最短的超短脉冲仍然是一项重大挑战。在本文中,我们将专门设计用于优化光学系统中重复过程的递归神经网络和自适应优化算法的使用范围扩大到智能搜索和控制,旨在实现锁模光纤激光器腔内的最短脉冲持续时间。我们基于多算法的智能系统可以完全模拟和优化动手实验所涉及的过程。我们的智能系统识别出了脉冲持续时间最短为 465 fs 的锁模光纤激光器,并得到了实验验证。所提出的智能算法不仅能识别出最短脉冲,而且在选择相关激光特性参数方面也具有巨大潜力。我们相信,这项工作为模式锁定激光器的探索和优化开辟了一条新途径,智能激光器可以在工程和科学研究中找到实际应用。
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引用次数: 0
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Infrared Physics & Technology
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