J. A. Medeiros Neto

Research Field

Praseodymium

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Citations (40)

Dysprosium doped Ga:La:S glass for an efficient optical fibre amplifier operating at 1.3 µm

Electronics Letters (1994)

Bryce Samson R.I. Laming D.W. Hewak J. A. Medeiros Neto

The authors present experimental results which indicate that a Dy3+-doped Ga:La:S glass fibre amplifier may be operated efficiently at 1.3 µm with an optimum device length significantly shorter than a comparable Pr3+-doped glass fibre amplifier. Moreover, the efficiency exceeds that obtained from the Pr3+-doped ZBLAN devices currently available.

ZBLAN

Dysprosium

10.1049/el:19941062

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Citations (39)

Infrared to visible frequency upconversion in erbium-doped Ga2S3–La2O3 chalcogenide glass

Optical Materials (1998)

H.T Amorim M. T. de Araújo E. A. Gouveia A.S. Gouveia-Neto J. A. Medeiros Neto

Photon Upconversion

Erbium

Chalcogenide glass

10.1016/s0925-3467(97)00173-0

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Citations (11)

Cadmium mixed halide glass for optical amplification at 1.3 μm

Journal of Non-Crystalline Solids (1995)

E.R. Taylor B.N. Samson D.W. Hewak J. A. Medeiros Neto D.N. Payne

10.1016/0022-3093(94)00596-6

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Citations (15)

ChemInform Abstract: An Ultra Stable Glass System for Optical Fiber Devices.

ChemInform (2001)

J. A. Medeiros Neto Norberto Aranha A. S. B. Sombra

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.200121203

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Citations (0)

Second-Harmonic Generation in Pr/sup 3+/-Doped Gallium-Lanthanum- Sulphide Glasses for Optical Fiber Amplifiers at 1.3/spl mu/m

M. V. D. Vermelho M. T. de Araújo A.S. Gouveia-Neto A. S. B. Sombra J. A. Medeiros Neto

Lanthanum

10.1109/cleoe.1996.562135

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PbTe quantum dot doped glasses with absorption edge in the 1.5 µm wavelength region

Electronics Letters (1995)

Victor Ciro Solano Reynoso Ana Paula Raúl Cuevas J. A. Medeiros Neto Oswaldo Luiz Alves

PbTe nanocrystals have been grown in doped glasses. By choosing the appropriate glass matrix and controlling the heat treatment temperatures and times, the quantum confined energy gaps of the PbTe dots can be changed in the wavelength range 1.1 – 2.0 µm. These glasses are potential materials for applications in optical communication and optoelectronic devices.

Absorption edge

10.1049/el:19950679

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Citations (33)

CdTe quantum dots in Era3+-doped borosilicate glass

Journal of Materials Science Letters (1996)

Victor Ciro Solano Reynoso Y. Liu R. F. C. Royas J. A. Medeiros Neto Ana Paula

Borosilicate glass

Cadmium telluride photovoltaics

10.1007/bf00264084

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Citations (2)

Thermally induced threefold upconversion emission enhancement in nonresonant excited Er3+/Yb3+-codoped chalcogenide glass

Applied Physics Letters (1999)

P. V. dos Santos E. A. Gouveia M. T. de Araújo A.S. Gouveia-Neto A. S. B. Sombra

Thermally induced threefold infrared-to-visible upconversion emission enhancement in Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glasses excited at 1.064 μm is reported. The times three upconversion efficiency enhancement was achieved by heating the sample in the temperature range of 23–155 °C, and is assigned to the temperature-dependent multiphonon-assisted anti-Stokes sideband excitation process of the ytterbium sensitizer. A theoretical analysis based upon rate equations considering the sensitizer absorption cross section as a function of the phonon occupation number in the host material exhibited very good agreement with experimental data.

Photon Upconversion

Ytterbium

Chalcogenide glass

10.1063/1.123196

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Citations (88)

Optical and mechanical design of an ophthalmic instrument: Slit lamp

Fmm Yasuoka Alessandra Cristina de Almeida Romão J. A. Medeiros Neto

Slit lamp

Slit

Optical instrument

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