Femtosecond Laser
Mostrando 1-12 de 63 artigos, teses e dissertações.
-
1. Comparison of pupillary diameter variation between conventional phacoemulsification versus femtosecond laser-assisted cataract surgery
RESUMO Objetivo: Avaliar e comparar a variação do diâmetro pupilar antes e após a cirurgia de catarata por facoemulsificação convencional versus cirurgia de catarata assistida por laser de femtossegundo, usando o LDV Z8 (Ziemer Ophtalmic). Também avaliamos a relação entre o diâmetro pupilar com o tempo da cirurgia e o tempo de ultrassom. Métodos
Arquivos Brasileiros de Oftalmologia. Publicado em: 2022
-
2. Ultrasound power and irrigation volume in different lens opacity grades: comparison of femtosecond laser-assisted cataract surgery and conventional phacoemulsification
OBJECTIVES: To compare the amount of ultrasound energy and irrigation volume in conventional phacoemulsification cataract surgery versus femtosecond laser-assisted phacoemulsification at different nuclear-cortical cataract grades. METHOD: This was a prospective, consecutive, investigator-masked nonrandomized parallel cohort study. Patients were divided int
Clinics. Publicado em: 28/10/2019
-
3. Refractive and visual outcomes after Ferrara corneal ring segment implantation at a 60% depth in keratoconic eyes: case series
RESUMO Objetivos: Este estudo aborda os resultados refrativos, topográficos, acuidade visual e tomografia de coerência óptica, 12 meses após a inserção do segmento de Anel de Ferrara em túnel corneano a 60% de profundidade com o laser de femtosegundo, em pacientes com ceratocone. Métodos: Série de casos não comparativos, prospectivos e intervenci
Arq. Bras. Oftalmol.. Publicado em: 29/08/2019
-
4. Influence of a Femtosecond Laser Surface Modification on the Fatigue Behavior of Ti-6Al-4V ELI Alloy
The objective of this investigation was to evaluate the influence of surface modification by femtosecond laser (with average fluence of 0.6 J/cm2 and scanning speed of 0.1 mm/s) on the fatigue resistance of Ti-6Al-4V ELI alloy. A significant reduction in the fatigue strength of the material modified by laser was observed. Residual tensile stresses generated
Mat. Res.. Publicado em: 01/07/2019
-
5. Efficacy of preoperative nonsteroidal anti-inflammatory drug and the re-dilation technique in minimizing miosis after femtosecond laser in cataract surgery
RESUMO Objetivo: Avaliar a eficácia do uso de anti-inflamatório não-esteróide no pré-operatório e aplicação da técnica de re-dilatação quando necessária para minimizar a variação do tamanho pupilar ao comparar o grau de midríase antes do tratamento com laser de femtosegundo no início da facoemulsificação. Métodos: Esse estudo retrospecti
Arq. Bras. Oftalmol.. Publicado em: 24/01/2019
-
6. Effects of Birefringence on the Electromagnetic Guidance of Structures Produced by Femtosecond Laser
Abstract Analysis of the state of polarization of light guided by structures recorded in lithium niobate and lithium fluoride crystals indicates that the recording method is determinant in the formation of birefringent structures. Each structure was written with a single and continuous translation of the crystal transversally to the laser beam. Birefringence
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
-
7. Nonlinear Optical Properties and Femtosecond Laser Micromachining of Special Glasses
Materials specially designed for photonics have been at the vanguard of chemistry, physics and materials science, driven by the development of new technologies. One particular class of materials investigated in this context are glasses, that in principle should exhibit high third order optical nonlinearities and fast response time, whose optical properties c
J. Braz. Chem. Soc.. Publicado em: 2015-12
-
8. NIR Luminescence from Sol-Gel Er3+ Doped SiO2:GeO2 Transparent Gels, Nanostructured Powders and Thin Films for Photonic Applications
Samples of (1 – x)SiO2:xGeO2 compositions, containing x = 10 and 20, and doped with Er3+, were prepared by a simple sol-gel route. Homogeneous and transparent gels were synthesized and xerogels were obtained by gel annealing from 700 ºC to 1100 ºC. Films exhibiting high transmittance in the visible and near infrared were deposited by spin-coating techniq
J. Braz. Chem. Soc.. Publicado em: 2015-12
-
9. Dimensions and refractive index estimates of deeply buried optical waveguides in Lithium Fluoride
A recursive procedure is applied to the measured near-field profiles of buried optical waveguides recorded in a lithium fluoride (LiF) crystal by femtosecond laser pulses in order to estimate the core dimensions and the refractive index increase. Albeit the waveguides transversal section geometry is quite complex it is possible to obtain the horizontal and v
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
-
10. Laser de femtossegundo de baixa energia e alta frequência na confecção de lamelas corneanas doadoras
Objetivo: Avaliar a eficácia e segurança de um laser de femtossegundo de baixa energia e alta taxa de repetição para confecção de lamelas corneanas doadoras anteriores profundas. Métodos: Este é um estudo prospectivo de investigação laboratorial. Vinte e cinco botões corneanos foram cortados com laser de femtossegundo para criar lamelas cornean
Rev. bras.oftalmol.. Publicado em: 2014-04
-
11. Femtosecond lasers for processing glassy and polymeric materials
Novel materials have been developed to meet the increasing mechanical, electrical and optical properties required for technological applications in different fields of sciences. Among the methods available for modifying and improving materials properties, femtosecond laser processing is a potential approach. Owing to its precise ablation and modification cap
Mat. Res.. Publicado em: 27/09/2013
-
12. Espectroscopia ultrarrápida do polímero semicondutor luminescente MEH-PPV com excitação no ultravioleta / Ultrafast spectroscopy of the luminescent semiconducting polymer MEH-PPV with ultraviolet excitation
The optoelectronics industry is currently undergoing a transition period in which inorganic materials are being replaced by organic materials, oligomers and polymers, in the fabrication of some types of devices. However, factors such as low efficiency and low lifetime prevent polymer based devices on entering the market definitely. The solution of these issu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012