A5007370959- Ferroelectric and Piezoelectric Materials
- Dielectric properties of ceramics
- Luminescence Properties of Advanced Materials
- Microwave Dielectric Ceramics Synthesis
- Solid State Laser Technologies
- Radiation Detection and Scintillator Technologies
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Photorefractive and Nonlinear Optics
- Pigment Synthesis and Properties
- Magnetic and transport properties of perovskites and related materials
- Catalysis and Hydrodesulfurization Studies
- Laser and Thermal Forming Techniques
- Industrial Gas Emission Control
- Photonic and Optical Devices
- Thermal Expansion and Ionic Conductivity
- Advanced Optical Imaging Technologies
- Photonic Crystals and Applications
- Ga2O3 and related materials
- Laser Material Processing Techniques
- Electrophoretic Deposition in Materials Science
- Semiconductor Lasers and Optical Devices
- Material Selection and Properties
- Advanced Materials Characterization Techniques
- Magneto-Optical Properties and Applications
Universidade Federal de Sergipe
2009-2023
Universidade Federal da Paraíba
2007
Universidade Federal de São Carlos
2001-2004
Universidade de São Paulo
2001-2004
Alumina porous ceramic with controlled pore size distribution was produced and its potential as a random laser host is investigated. Bi-chromatic observed from rhodamine B infiltrated when excited by 532 nm pulsed laser. Two regimes were characterized associated the excitation of monomers dimers. The results show that this class material very promising for development low-cost solid state lasers.
This work demonstrates the possibility of synthesis cadmium tungstate at low temperatures using oxide precursors. Cadmium (CdWO 4 ) scintillator was produced via microwave-assisted hydrothermal reaction precursors CdO and WO 3 . The methodology based on microwave radiation for heating, which is remarkably faster than solid-state route or conventional procedure. CdWO monoclinic (wolframite) structure successfully obtained 120°C times as short 20 min. does not require use templates surfactants...
Optical spectroscopy studies of Nd3+-doped scheelite calcium molybdate (CaMoO4) single crystal grown by a floating zone-like technique was performed using Judd-Ofelt analysis, besides luminescence data and lifetime measurements in the visible near infrared domains. The excited state absorption cross section units this material measured two different methods for all expected emission. By calculated intensity parameters (t=2, 4, 6), it were determined branching ratios, emission cross-sections,...
We report on peculiar dynamic features of laser oscillation in a cavity with semiconductor junction as the gain medium and an intracavity atomic absorber. The output face is antireflection coated, lasing action achieved by using diffraction grating to close cavity. spectral analysis emission evidences stable narrow linewidth when oscillating frequency resonant also observe bistability instability. change between these regimes controlled through bias current very reproducible way.
The control of the thermal gradient in single crystal grown by laser-heated pedestal growth method is demonstrated through focalization laser beam into two different regions starting feed stock. To create these conditions, an optical component consisting incomplete spherical mirrors with same focal distances was designed and built copper coated aluminum. performance this tested lithium niobate rods a radius larger than critical calculated from theoretical model for beam. Thermal temperature...
The production of high-density Bi 12 TiO 20 ceramics, their transmission spectrum, and impedance features are reported. samples were synthesized at 700°C/6 h sintered 800°C/3 h. This procedure yielded translucent ceramics with relative density of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mn>99.2</mml:mn><mml:mo>±</mml:mo><mml:mn>0.5</mml:mn></mml:mrow></mml:math>% average grain size...
Abstract The analysis of the melt profile in floating zone techniques has been made past years by raising differential equations terms Cartesian coordinates and numerically looking for its solution. Although this method permits to establish quite good approximations real profile, solutions are deficient prediction new information that can be related thermophysical properties most materials. We investigated applicability a different approach starting from novel equation fitting situation also...
Nesse trabalho abordamos a obtenção do material cerâmico Gd2Mo3O12 na sua fase b, denominado b-GMO, utilizando-se método convencional de mistura óxidos e reação estado sólido. MoO3 o Gd2O3 nas razões molares 3:1 3,25:1 foram usados como pós partida. Cerâmicas sinterizadas usadas pedestais sementes produção fibras monocristalinas pela técnica Laser Heated Pedestal Growth- LHPG. A cerâmica com única foi melhor obtida usando razão molar entre os Por outro lado, cristalinas obtidas partir...