Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications最新文献_第8页

Broadband coherent mid-IR supercontinuum generation using highly nonlinear tapered photonic crystal fibers 利用高度非线性锥形光子晶体光纤产生宽带相干中红外超连续谱

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027491

A. Ben Salem, R. Chérif, M. Zghal

引用次数: 0

White light interferometry applied to wavelength calibration of spectrometers 白光干涉法在光谱仪波长校正中的应用

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026187

H. González-Núñez, R. de la Fuente

引用次数: 1

Analysis of strawberry ripening by dynamic speckle measurements 动态斑点测量法分析草莓成熟过程

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2022414

C. Mulone, N. Budini, F. Vincitorio, C. Freyre, A. L. López Díaz, A. Ramil Rego

{"title":"Analysis of strawberry ripening by dynamic speckle measurements","authors":"C. Mulone, N. Budini, F. Vincitorio, C. Freyre, A. L. López Díaz, A. Ramil Rego","doi":"10.1117/12.2022414","DOIUrl":"https://doi.org/10.1117/12.2022414","url":null,"abstract":"This work seeks to determine the age of a fruit from observation of its dynamic speckle pattern. A mobile speckle pattern originates on the fruit's surface due to the interference of the wavefronts reflected from moving scatterers. For this work we analyzed two series of photographs of a strawberry speckle pattern, at different stages of ripening, acquired with a CMOS camera. The first day, we took ten photographs at an interval of one second. The same procedure was repeated the next day. From each series of images we extracted several statistical descriptors of pixel-to-pixel gray level variation during the observation time. By comparing these values from the first to the second day we noticed a diminution of the speckle activity. This decay demonstrated that after only one day the ripening process of the strawberry can be detected by dynamic speckle pattern analysis. For this study we employed a simple new algorithm to process the data obtained from the photographs. This algorithm allows defining a global mobility index that indicates the evolution of the fruit's ripening.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122543681","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: 14

Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation 基于自适应模糊估计的空间变模糊退化视网膜图像盲恢复

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025134

A. Marrugo, M. S. Millán, M. Šorel, F. Šroubek

引用次数: 2

Optical fiber tapers produced by near-infrared laser radiation 近红外激光辐射产生的光纤变细

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026258

Marta Nespereira, J. Coelho, F. Monteiro, M. Abreu, J. Rebordão

引用次数: 3

Study on compactness of planar waveguide based integrated optic couplers using tooth shaped grating assisted geometry 利用齿形光栅辅助几何技术研究平面波导集成光耦合器的紧凑性

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2030427

B. Deka, Aradhana Dutta, P. Sahu

{"title":"Study on compactness of planar waveguide based integrated optic couplers using tooth shaped grating assisted geometry","authors":"B. Deka, Aradhana Dutta, P. Sahu","doi":"10.1117/12.2030427","DOIUrl":"https://doi.org/10.1117/12.2030427","url":null,"abstract":"The introduction of Photonic Integrated Devices (PID) for applications in high speed optical networks providing multiple services to more number of users is indispensable as this requires large scale integration (LSI) and the miniaturization of PID device components to microscale platform has attracted immense attention from the researchers and entrepreneurs. In this paper, we present a comparative study on compactness of basic PID components using tooth shaped grating assisted (TSGA) geometry. The basic PID components such as Directional Coupler (DC), two mode interference (TMI) coupler and multimode interference (MMI) coupler have been designed using TSGA geometry in the coupling region and the coupling characteristics for the same have been estimated using a mathematical model based on sinusoidal mode simple effective index method (SM-SEIM). The dependence of modal power in the coupling region on the waveguide separation gap and coupling gap refractive index has been studied. From the estimated dependences of beat length and access waveguide length on waveguide separation gap with permissible propagation loss ~0.15 dB/cm, it has been found that the grating assisted TMI coupler (GA-TMI) is ~0.5 times lower than that of grating assisted DC (GA-DC) and ~0.44 times lower than grating assisted MMI (GA-MMI) coupler. Further, it is seen that the device length including access waveguide length of GA-MMI coupler is less than that of GA-TMI coupler and GA-DC. The SM-SEIM based numerical results are then compared with beam propagation method (BPM) results obtained by using commercially available optiBPM software.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117338584","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

Solvent effects on the optical properties of two-level systems with permanent dipole moments 溶剂对具有永久偶极矩的两能级体系光学性质的影响

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2021368

A. Mastrodoménico, M. Izquierdo, J. L. Paz, P. Colmenares

引用次数: 0

Parameterization using Fourier series expansion of the diffuse reflectance of human skin to vary the concentration of the melanocytes 利用傅立叶级数展开人体皮肤的漫反射来参数化黑素细胞的浓度

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026247

J. Narea, A. Muñoz, J. Castro, Rafael A. Muñoz, Caroleny E. Villalba, María F. Martinez, Kelly Bravo

引用次数: 0

UV-visible transmittance of silicone-hydrogel contact lenses measured with a fiber optic spectrometer 用光纤分光计测定硅胶-水凝胶隐形眼镜的紫外-可见光透过率

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025710

R. Fuentes, E. Fernández, I. Pascual, C. García

{"title":"UV-visible transmittance of silicone-hydrogel contact lenses measured with a fiber optic spectrometer","authors":"R. Fuentes, E. Fernández, I. Pascual, C. García","doi":"10.1117/12.2025710","DOIUrl":"https://doi.org/10.1117/12.2025710","url":null,"abstract":"Protein deposition is one of the most frequent contaminants occurring on hydrophilic contact lenses and may modify the lens optical properties. The silicone-hydrogel contact lenses usually adsorb a lower amount of proteins than the conventional hydrogel ones. However it is important to study the influence of protein deposits on some silicone-hydrogel contact lenses properties, such as UV-Visible transmittance. In this study it is measured de UV-Visible properties of new and worn silicone-hydrogel contact lenses and the transmittance changes that can occur with wear are quantified. An optical fiber spectrometer has been used for measuring the transmittance of contact lenses. This spectrometer has the advantage that the lens can be positioned horizontally and the light beam passes through it perpendicularly. For the measurements, it was necessary to make a special cuvette to put inside the lens and keep it submerged in sterile saline solution. The contact lenses used were Biofinity®. They are manufactured by CooperVision with a material whose technical name is Comfilcon A. This material has not yet been analyzed for this purpose. Moreover, in this type of studies are commonly taken lenses of power -3.00D, however we have not limited to a single power value but we have extended the range to lower and higher values regarding to the standard power in order to see how this parameter affects.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114717062","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: 7

Digital holographic interferometry accelerated with GPU: application in mechanical micro-deformation measurement operating at video rate GPU加速的数字全息干涉测量:在视频速率下机械微变形测量中的应用

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2021693

N. Munera Ortiz, C. Trujillo, J. Garcia-Sucerquia

引用次数: 0