Publicacoes - INESC TEC

Publicações

Publicações por José Almeida

2000

<title>Modeling of laser emission at 0.9 µm in Nd:LiNbO<formula><inf><roman>3</roman></inf></formula></title>

Autores
de Almeida, JMMM; Leite, AMPP; Amin, J;

Publicação
Rare-Earth-Doped Materials and Devices IV

Abstract

2000

<title>Spectroscopy of doped lithium niobate</title>

Autores
de Almeida, JMMM; Leite, AMPP; Amin, J;

Publicação
Rare-Earth-Doped Materials and Devices IV

Abstract

2006

<title>Proton exchanged waveguides in LiNbO<formula><inf><roman>3</roman></inf></formula>: characterization and design methodology</title>

Autores
Martins de Almeida, JMM; Pereira Leite, AMP;

Publicação
Integrated Optics: Devices, Materials, and Technologies X

Abstract

2007

<title>Simulation of various configurations of single-pump dispersion-compensating Raman/EDFA hybrid amplifiers</title>

Autores
de Andrade, MAP; Anacleto, J; de Almeida, JMMM;

Publicação
Physics and Simulation of Optoelectronic Devices XV

Abstract

1995

CHROMIUM DIFFUSION IN LITHIUM-NIOBATE FOR ACTIVE OPTICAL WAVE-GUIDES

Autores
ALMEIDA, JM; BOYLE, G; LEITE, AP; DELARUE, RM; IRONSIDE, CN; CACCAVALE, F; CHAKRABORTY, P; MANSOUR, I;

Publicação
JOURNAL OF APPLIED PHYSICS

Abstract
A method to fabricate chromium-doped lithium niobate substrates in which the active ions are introduced by thermal diffusion from a film is reported. Chromium concentration depth profiles have been obtained by secondary-ion-mass spectrometry and the relevant diffusion parameters have been derived. Fluorescence spectrum and upper laser level lifetime of chromium diffused proton-exchanged and chromium/titanium-diffused lithium niobate waveguides have been measured. A simple model has been used to estimate the performance of such structures as waveguide optical amplifiers and lasers. (C) 1995 American Institute of Physics.

FecharLer Abstract

1997

900-nm Nd:Ti:LiNbO3 waveguide laser

Autores
Brown, CTA; Amin, J; Shepherd, DP; Tropper, AC; Hempstead, M; Almeida, JM;

Publicação
OPTICS LETTERS

Abstract
We report what is to our knowledge the first laser operation of Nd3+-doped LiNbO3 near 900 nm. An absorbed power threshold of 26 mW was obtained when the device was pumped at 814 nm. The design of the waveguide geometry to favor laser operation at this wavelength is demonstrated. (C) 1997 Optical Society of America.

FecharLer Abstract