OSA Continuum最新文献_第8页

Influence of wavefront types on movement artefacts in handheld laser speckle contrast perfusion imaging 手持式激光散斑造影灌注成像中波前类型对运动伪影的影响

IF 1.6

OSA Continuum Pub Date : 2021-06-11 DOI: 10.1364/OSAC.420479

Ata Chizari, Tom Knop, Wilson Tsong, Sven Schwieters, W. Steenbergen

引用次数: 6

Simple Self-calibrating Polarimeter forMeasuring the Stokes Parameters of Light 测量光斯托克斯参数的简易自校准偏振仪

IF 1.6

OSA Continuum Pub Date : 2021-05-26 DOI: 10.1364/OSAC.444102

Vitaly Wirthl, C. Panda, P. Hess, G. Gabrielse

引用次数: 0

Amplification of 108 GHz repetition rate femtosecond laser pulses to 97 W average power by a fiber amplifier 光纤放大器将108GHz重复频率飞秒激光脉冲放大到97W平均功率

IF 1.6

OSA Continuum Pub Date : 2021-05-04 DOI: 10.1364/OSAC.423499

Yan Wang, Yizhou Liu, Zhigang Zhang, F. Kaertner

引用次数: 2

Investigating the probe-tip influence on imaging using scanning near-field optical microscopy 利用扫描近场光学显微镜研究探针尖端对成像的影响

IF 1.6

OSA Continuum Pub Date : 2021-04-15 DOI: 10.1364/OSAC.415810

Panji Achmari, Arif M. Siddiquee, G. Si, Jiao Lin, B. Abbey, S. Kou

引用次数: 1

Improving the signal-to-noise ratio of atomic transitions in LIBS using two-dimensional correlation analysis 利用二维相关分析提高LIBS中原子跃迁的信噪比

IF 1.6

OSA Continuum Pub Date : 2021-03-25 DOI: 10.1364/OSAC.426995

L. Narlagiri, Venugopal Rao Soma

{"title":"Improving the signal-to-noise ratio of atomic transitions in LIBS using two-dimensional correlation analysis","authors":"L. Narlagiri, Venugopal Rao Soma","doi":"10.1364/OSAC.426995","DOIUrl":"https://doi.org/10.1364/OSAC.426995","url":null,"abstract":"In this study, two-dimensional (2D) correlation analysis was utilized for achieving a significant improvement in the signal-to-noise (S/N) ratio of laser-induced breakdown spectroscopy (LIBS) data. Time-resolved LIBS spectra of metallic, bimetallic targets and the normal LIBS spectra of bimetallic targets with varying compositions were used for the detailed analysis. The diagonal of the matrix in the synchronous spectra was used to demonstrate the improvement in the S/N ratio. An improvement in the peak intensities by few orders of magnitude accompanied by suppression in the noise was observed. The correlations between LIBS peaks were also visualized using 2-D plots. Correlation strengths of atomic transitions were visualized in Aluminium (Al), Copper (Cu), and Brass whereas correlation strengths of atomic, atomic and ionic transitions were visualized in Au-Ag bimetallic targets with different compositions (Au30Ag70, Au50Ag50, Au80Ag20). The improved spectra were subsequently used in the principal component analysis for classification studies of four compositions of bimetallic targets (Au20Ag80, Au30Ag70, Au50Ag50, and Au80Ag20). The variance of the first three principal components was found to be improved from the analysis. The accumulated percentage of explained variance of ~95 was achieved with the first three components from improved spectra whereas only ~80 was achieved with the regular LIBS spectra from PCA studies.","PeriodicalId":19750,"journal":{"name":"OSA Continuum","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41801175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Efficient reservoir computing using field programmable gate array and electro-optic modulation 利用现场可编程门阵列和电光调制的高效储层计算

IF 1.6

OSA Continuum Pub Date : 2021-02-11 DOI: 10.1364/OSAC.417996

Prajnesh Kumar, Mingwei Jin, Ting Bu, Santosh Kumar, Yu-Ping Huang

{"title":"Efficient reservoir computing using field programmable gate array and electro-optic modulation","authors":"Prajnesh Kumar, Mingwei Jin, Ting Bu, Santosh Kumar, Yu-Ping Huang","doi":"10.1364/OSAC.417996","DOIUrl":"https://doi.org/10.1364/OSAC.417996","url":null,"abstract":"We experimentally demonstrate a hybrid reservoir computing system consisting of an electro-optic modulator and field programmable gate array (FPGA). It implements delay lines and filters digitally for flexible dynamics and high connectivity, while supporting a large number of reservoir nodes. To evaluate the system’s performance and versatility, three benchmark tests are performed. The first is the 10th order Nonlinear Auto-Regressive Moving Average test (NARMA-10), where the predictions of 1000 and 25,000 steps yield impressively low normalized root mean square errors (NRMSE’s) of 0.142 and 0.148, respectively. Such accurate predictions over into the far future speak to its capability of large sample size processing, as enabled by the present hybrid design. The second is the Santa Fe laser data prediction, where a normalized mean square error (NMSE) of 6.73 × 10−3 is demonstrated. The third is the isolate spoken digit recognition, with a word error rate close to 0.34%. Accurate, versatile, flexibly reconfigurable, and capable of long-term prediction, this reservoir computing system could find a wealth of impactful applications in real-time information processing, weather forecasting, and financial analysis.","PeriodicalId":19750,"journal":{"name":"OSA Continuum","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43659067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Nonlinear beam matching to gas-filled multipass cells 充气多通电池的非线性光束匹配

IF 1.6

OSA Continuum Pub Date : 2021-02-05 DOI: 10.1364/OSAC.418247

M. Hanna, L. Daniault, F. Guichard, Nour Daher, X. Délen, R. López-Martens, P. Georges

引用次数: 1

Temporal stability of calibration functions in the traditional pure rotational Raman lidar technique 传统纯旋转拉曼激光雷达标定函数的时间稳定性

IF 1.6

OSA Continuum Pub Date : 2021-01-25 DOI: 10.1364/OSAC.404945

V. V. Gerasimov

{"title":"Temporal stability of calibration functions in the traditional pure rotational Raman lidar technique","authors":"V. V. Gerasimov","doi":"10.1364/OSAC.404945","DOIUrl":"https://doi.org/10.1364/OSAC.404945","url":null,"abstract":"Pure rotational Raman (PRR) lidars should be calibrated to measure atmospheric temperature. In the frame of the traditional PRR technique, the lidar calibration represents the determination of calibration function (CF) coefficients using a reference temperature profile from an atmosphere model or radiosonde data. When a measurement campaign lasts several days, the accuracy of temperature retrieval from PRR lidar signals depends on the temporal stability of the selected CF. In this paper, we present a simple way to intercompare different CFs and determine the most stable function in time among them. We study to what extent the CF coefficients determined on one of the measurement campaign days may be used for temperature retrieval on the other days. We also examine the situation when reference radiosonde data are absent on one of the measurement days and, therefore, the CF coefficients need to be determined from reference data over the remaining days. The 1-week and 3-day temporal stabilities of five CFs are studied on the example of nighttime temperature profiles retrieved from PRR lidar measurements of 1, 6, 7, and 8 April 2015. The stability of these CFs is studied for the first time. The measurements were performed in Tomsk (56.48°N, 85.05°E, Western Siberia, Russia) using a PRR lidar of the Institute of Monitoring of Climatic and Ecological Systems (IMCES). The CF retrieving temperature of the troposphere (3–9 km) with the highest accuracy for the considered 1-week and 3-day measurement periods is determined for the IMCES lidar.","PeriodicalId":19750,"journal":{"name":"OSA Continuum","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44783597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inverse spectroscopic optical coherence tomography (IS-OCT) for characterization of particle size and concentration 反光谱光学相干层析成像(IS-OCT)用于表征颗粒大小和浓度

IF 1.6

OSA Continuum Pub Date : 2021-01-12 DOI: 10.1364/osac.428245

J. Hope, Matthew Goodwin, F. Vanholsbeeck

引用次数: 0

Inverse photonic-crystal-fiber design through geometrical and material scalings 通过几何和材料缩放的逆光子晶体光纤设计

IF 1.6

OSA Continuum Pub Date : 2020-12-24 DOI: 10.1364/osac.408646

E. Silvestre, Aktham Tashtush, David Castelló-Lurbe, M. Andrés

引用次数: 1