Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications最新文献

New developments on the design and modeling of fiber optical tweezers 光纤镊子设计与建模的新进展

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027443

R. S. Rodrigues Ribeiro, P. Jorge, A. Guerreiro

引用次数: 4

Development of a subjective refraction simulator 主观折射模拟器的研制

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026310

S. Perches, J. Ares, M. Collados

引用次数: 1

Extremely small-core photonic crystal fiber fusion splicing with a single-mode fiber 极小芯光子晶体光纤与单模光纤熔接

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027586

B. Tibúrcio, G. Fernandes, A. Pinto

引用次数: 0

Gabor transform applied to superresolution in optical systems Gabor变换在光学系统超分辨中的应用

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026404

C. Jimenez, R. Perez, C. Torres

引用次数: 0

System for measuring the angular response of radiometers 测量辐射计角响应的系统

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2019888

L. A. Berni, W. Vilela, A. F. Beloto, Felipe Oliveira de Sena

引用次数: 3

Design of a control system for interferometric fringe stabilization system with remote access 远程干涉条纹稳定系统控制系统的设计

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026402

Javier Espitia-Gómez, Luciano Ángel-Toro, D. Velásquez

引用次数: 0

Operating principle of a high resolution ultrasonic ranging system based in a phase processing 基于相位处理的高分辨率超声测距系统的工作原理

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025832

Laura X. Chaparro, C. R. Contreras, J. Meneses

引用次数: 2

Optical simulation of laser beam phase-shaping focusing optimization in biological tissues 生物组织中激光束相位整形聚焦优化的光学模拟

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026238

Ricardo Gomes, P. Vieira, J. Coelho

{"title":"Optical simulation of laser beam phase-shaping focusing optimization in biological tissues","authors":"Ricardo Gomes, P. Vieira, J. Coelho","doi":"10.1117/12.2026238","DOIUrl":"https://doi.org/10.1117/12.2026238","url":null,"abstract":"In this paper we report the development of an optical simulator that can be used in the development of methodologies for compensate/decrease the light scattering effect of most biological tissues through phase-shaping methods. In fact, scattering has long been a major limitation for the medical applications of lasers where in-depth tissues concerns due to the turbid nature of most biological media in the human body. In developing the simulator, two different approaches were followed: one using multiple identical beams directed to the same target area and the other using a phase-shaped beam. In the multiple identical beams approach (used mainly to illustrate the limiting effect of scattering on the beam’s propagation) there was no improvement in the beam focus at 1 mm compared to a single beam layout but, in phase-shaped beam approach, a 8x improvement on the radius of the beam at the same depth was achieved. The models were created using the optical design software Zemax and numerical algorithms created in Matlab programming language to shape the beam wavefront. A dedicated toolbox allowed communication between both programs. The use of the two software’s proves to be a simple and powerful solution combining the best of the two and allowing a significant potential for adapting the simulations to new systems and thus allow to assess their response and define critical engineering parameters prior to laboratorial implementation.","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":"122303246","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: 3

Identification of retinal cells in in-vivo high resolution images 视网膜细胞在体内高分辨率图像中的识别

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027265

P. Rangel-Fonseca, A. Gómez-Vieyra, D. Malacara-hernández, Julio C. Estrada-Rico, Geovanni Hernandez-Gomez

{"title":"Identification of retinal cells in in-vivo high resolution images","authors":"P. Rangel-Fonseca, A. Gómez-Vieyra, D. Malacara-hernández, Julio C. Estrada-Rico, Geovanni Hernandez-Gomez","doi":"10.1117/12.2027265","DOIUrl":"https://doi.org/10.1117/12.2027265","url":null,"abstract":"Recent advances in the acquisition of in-vivo high resolution retinal images through the use of Adaptive Optics (AO) have allowed the identification of cellular structures such as cones and rods, in and out of the fovea, in such a way that their histological characteristics can be studied in-vivo and later compared to data obtained post-mortem. In this work, an algorithm is proposed for the detection of photoreceptors; it consists of two stages: Early Cell Detection (ECD), to detect all candidate cells, and Refinement of Cell Detection (RCD), to reduce over-detection of photoreceptors. The algorithm has been tested using synthetic and real images, the latter acquired with an Adaptive Optics Scanning Light Ophthalmoscope (AOSLO). The proposed algorithm was compared against the one developed by Li and Roorda, and both algorithms were tested on synthetic and real images, yielding similar algorithm performance on both kinds of images when they had only cones; however, the algorithm developed by Li and Roorda, when applied to real images having cones and rods, identifies photoreceptors in vascular tissue, in addition to showing low rod detection.","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":"122565722","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

Laser bioengineering of glass-titanium implants surface 玻璃钛植入物表面的激光生物工程

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026115

F. Lusquiños, F. Arias-González, J. Penide, J. del Val, R. Comesaña, F. Quintero, A. Riveiro, M. Boutinguiza, M. Pascual, A. Durán, J. Pou

{"title":"Laser bioengineering of glass-titanium implants surface","authors":"F. Lusquiños, F. Arias-González, J. Penide, J. del Val, R. Comesaña, F. Quintero, A. Riveiro, M. Boutinguiza, M. Pascual, A. Durán, J. Pou","doi":"10.1117/12.2026115","DOIUrl":"https://doi.org/10.1117/12.2026115","url":null,"abstract":"Osseointegration is the mean challenge when surgical treatments fight against load-bearing bone diseases. Absolute bone replacement by a synthetic implant has to be completed not only from the mechanics point of view, but also from a biological approach. Suitable strength, resilience and stress distribution of titanium alloy implants are spoiled by the lack of optimal biological characteristics. The inert quality of extra low interstitial titanium alloy, which make it the most attractive metallic alloy for biomedical applications, oppose to an ideal surface with bone cell affinity, and capable to stimulate bone attachment bone growth. Diverse laser treatments have been proven as effective tools to modify surface properties, such as wettability in contact to physiological fluids, or osteoblast guided and slightly enhanced attachment. The laser surface cladding can go beyond by providing titanium alloy surfaces with osteoconduction and osteoinduction properties. In this research work, the laser radiation is used to produce bioactive glass coatings on Ti6Al4V alloy substrates. Specific silicate bioactive glass compositions has been investigated to achieve suitable surface tension and viscosity temperature behavior during processing, and to provide with the required release of bone growth gene up regulation agents in the course of resorption mediated by physiological fluids. The produced coatings and interfaces, the surface osteoconduction properties, and the chemical species release in simulated physiological fluid were characterized by scanning electron microscopy (SEM), hot stage microscopy (HSM), X-ray diffraction (XRD), X ray fluorescence (XRF), and Fourier transform infrared spectroscopy (FTIR).","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":"122509415","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: 1