Journal of Russian Laser Research最新文献_第6页

Design and Analysis of Holmium-Doped Fiber Amplifier for WDM System in 1990 – 2100 nm Wavelength Range at Higher Bit Rates 1990 ~ 2100 nm波分复用系统中高比特率掺钬光纤放大器的设计与分析

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-25 DOI: 10.1007/s10946-023-10181-3

Hafiz Muhammad Obaid, Kinzah Noor, Maaz Tahir Malik, Abdul Rehman

引用次数: 0

Kerr Effect as a Mode Locker in Er-Doped Fiber Laser 克尔效应作为掺铒光纤激光器的锁模器

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-25 DOI: 10.1007/s10946-023-10175-1

Yu Chen, Ahmad Haziq A. Rosol, Sin Jin Tan, Zian Cheak Tiu, Kaharudin Dimyati, Sulaiman Wadi Harun

引用次数: 0

Theoretical Analysis of Resonant Hyper-Raman Scattering of Light by 2 LO Phonons in a CdS Crystal CdS晶体中2 LO声子共振超拉曼散射的理论分析

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-24 DOI: 10.1007/s10946-023-10169-z

Ludmila E. Semenova

引用次数: 0

An Apertureless Scanning Near-Field Optical Microscope Probe with a Lateral Resolution of 10 – 15 nm Observed with a Semiconductor Structure 用半导体结构观察到横向分辨率为10 ~ 15nm的无孔径扫描近场光学显微镜探针

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-24 DOI: 10.1007/s10946-023-10174-2

D. V. Kazantsev, A. V. Klekovkin, I. I. Minaev, E. A. Kazantseva, S. N. Nikolaev

引用次数: 0

Effect of Geometric Parameters of Metallic Nanoprisms on the Plasmonic Resonance Wavelength 金属纳米棱镜几何参数对等离子共振波长的影响

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-24 DOI: 10.1007/s10946-023-10171-5

Alexey D. Kondorskiy, Arseniy V. Mekshun

{"title":"Effect of Geometric Parameters of Metallic Nanoprisms on the Plasmonic Resonance Wavelength","authors":"Alexey D. Kondorskiy, Arseniy V. Mekshun","doi":"10.1007/s10946-023-10171-5","DOIUrl":"10.1007/s10946-023-10171-5","url":null,"abstract":"<div><p>We study the effect of geometric dimensions on the optical properties of equilateral triangular gold and silver nanoprisms with rounded corners. An analytical expression for calculating the spectral characteristics of the main longitudinal plasmonic resonance of such nanoprisms is obtained. As variables, the expression includes the nanoprism dimensions, its composition, and the permittivity of the surrounding environment. Our results demonstrate that the extinction cross sections can be adequately described by this expression for nanoprisms with edge lengths up to a few hundred nanometers. We show that the scattering of free electrons from the metal/environment interface in metallic nanoprisms can be described with the help of the size-dependent dielectric function. Using a simple relation, we evaluate the necessary effective size parameter, which allows one to achieve a good agreement with experimental data. The results obtained are of interest for solving a number of fundamental problems in nanophotonics and nanoplasmonics, as well as for applications in the development of next-generation optoelectronic devices.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Interaction of Terahertz Radiation Pulse with a Plasma Layer in a Magnetic Field 磁场中太赫兹辐射脉冲与等离子体层的相互作用

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-24 DOI: 10.1007/s10946-023-10170-6

Vyacheslav E. Grishkov, Polina D. Trofimova, Sergey A. Uryupin

引用次数: 0

A Small-Size 3d Object Detection Network for Analyzing the Sparsity of Raw Lidar Point Cloud 用于分析原始激光雷达点云稀疏度的小尺寸三维目标检测网络

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-24 DOI: 10.1007/s10946-023-10173-3

Bo Zhang, Haosen Wang, Suilian You, Chengfeng Bao, Shifeng Wang, Bo Lu, Jonghyuk Kim

{"title":"A Small-Size 3d Object Detection Network for Analyzing the Sparsity of Raw Lidar Point Cloud","authors":"Bo Zhang, Haosen Wang, Suilian You, Chengfeng Bao, Shifeng Wang, Bo Lu, Jonghyuk Kim","doi":"10.1007/s10946-023-10173-3","DOIUrl":"10.1007/s10946-023-10173-3","url":null,"abstract":"<div><p>LiDAR is one of the main sensors for 3D object detection in autonomous driving. LiDAR has the advantages of high precision and high resolution, but as the distance increases, the points it acquires become sparse, resulting in uneven sampling points and hindering the feature extraction of discrete objects. Current 3D object detection methods using LiDAR ignore the sparse features of the original LiDAR point cloud, resulting in low classification accuracy over small object detection, hindering the development of autonomous driving technology. To address this problem, we propose point cloud Sparse Detection Network (PCSD), an end-to-end two-stage 3D object detection framework. First, PCSD uses a data augmentation algorithm to preprocess the KITTI dataset, then uses voxel point centroids to locate voxel features, and then uses a point sparsity-aware RoI grid pooling module to aggregate local voxel features. Finally, we improve the confidence of the final bounding box by using voxel features with the original point cloud sparse features. Experimental evaluation on the challenging KITTI object detection benchmark shows significant improvements, especially in pedestrian and cyclist classification accuracy improved by 13.22% and 9.33%, respectively, demonstrating the feasibility and applicability of our work.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A Two-Stage Lidar-Based Approach for Enhanced Pedestrian and Cyclist Detection 基于激光雷达的两阶段增强行人和骑车人检测方法

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-23 DOI: 10.1007/s10946-023-10158-2

Yue Ma, Lei Miao, Haosen Wang, Yan Li, Bo Lu, Shifeng Wang

{"title":"A Two-Stage Lidar-Based Approach for Enhanced Pedestrian and Cyclist Detection","authors":"Yue Ma, Lei Miao, Haosen Wang, Yan Li, Bo Lu, Shifeng Wang","doi":"10.1007/s10946-023-10158-2","DOIUrl":"10.1007/s10946-023-10158-2","url":null,"abstract":"<div><p>In recent years, the application scope of LIDAR has been continuously expanding, especially in object detection. Yet existing LIDAR-based methods focus on detecting vehicles on regular roadways. Scenarios with a higher prevalence of pedestrians and cyclists, such as university campuses and leisure centers, have recently received limited attention. To solve this problem, in this paper we propose a novel detection algorithm named SecondRcnn, which is built upon the SECOND algorithm and introduces a novel two-stage detection method. In the first stage, it utilizes 3D sparse convolution on the voxel LIDAR points to learn feature representations. In the second stage, regression is employed to refine the detection bounding boxes generated by the Region Of Interest pooling network. The algorithm was evaluated on the widely used KITTI data set and demonstrated significant performance improvements in detecting pedestrians (4.61% improvement) and cyclist (6.5% improvement) compared to baseline networks. Our work highlights the potential for accurate object detection in scenarios characterized by a higher presence of pedestrians and cyclists. Advancing the use of LIDAR in the field of 3D detection.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139347041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Tantalum Selenide Micro-Wafer Terahertz Emitter 硒化钽微晶片太赫兹发射器

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-23 DOI: 10.1007/s10946-023-10161-7

Chuanxiang Ye, Jintao Wang

{"title":"Tantalum Selenide Micro-Wafer Terahertz Emitter","authors":"Chuanxiang Ye, Jintao Wang","doi":"10.1007/s10946-023-10161-7","DOIUrl":"10.1007/s10946-023-10161-7","url":null,"abstract":"<div><p>Terahertz waves possess distinct characteristics, including such as transience, coherence, low energy, penetration, and fingerprint spectroscopy, which render them well-suited for a diverse range of applications in security inspection, nondestructive testing, and environmental detection. However, the efficiency of terahertz wave generation remains constrained by the terahertz source. To address this limitation and minimize losses in the generation process, the selection of band-gap-free semi-metallic materials, as terahertz radiation sources, is of utmost importance. We successfully fabricate TaSe<sub>2</sub> micro-wafer measuring 1×0.5 μm. By employing optical pumping at a wavelength of 1040 nm and a pulse duration of 150 fs, we achieve a terahertz output of nearly 0.005 μW. This output surpasses the terahertz generation efficiency of GaP crystals by approximately 20% under the same power density. Furthermore, we conduct investigations into the impact of incidence and optical polarization on terahertz wave generation. TaSe<sub>2</sub> exhibits suitability for high-efficiency, micro–nano-scale terahertz wave generation applications, such as on-chip terahertz systems and micro–nano terahertz sources.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Tuning the efficiency of Random Laser Generation in a Suspension of ZnO Nanoparticles by Means of its Directional Freezing 利用ZnO纳米颗粒的定向冻结调节悬浮中随机激光产生的效率

IF 0.7 4区物理与天体物理

Journal of Russian Laser Research Pub Date : 2023-11-23 DOI: 10.1007/s10946-023-10179-x

S. F. Umanskaya, M. A. Shevchenko, N. V. Tcherniega, A. N. Maresev, A. A. Matrokhin, M. A. Karpov, V. V. Voronova

引用次数: 0