Laser Active Media
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Caracterizações estruturais e espectroscópicas de cerâmicas ferroelétricas de PLZT dopadas com íons de terras raras trivalentes / Structural and spectroscopy characterization of rare-earth doped PLZT ferroelectric ceramics
Recentemente, grande interesse tem sido demonstrado por cerâmicas transparentes dopadas com íons terras raras trivalentes, como meios ativos para lasers na região espectral do infravermelho próximo. Em particular, cerâmicas dopadas com altas concentrações de Nd3+ e Yb3+ são muito estudadas pela possibilidade de gerar emissão laser de alta potência
Publicado em: 2009
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2. Tratamento de varizes dos membros inferiores com laser endovenoso em pacientes com ulcera em atividade e medida das temperaturas intra e perivenosas durante o procedimento / Endovenous laser treatment for varicose veins in patients with active ulcers. Measurement of intravenous and perivenous temperatures during the procedure
Este estudo foi desenvolvido para avaliar, prospectivamente, os resultados do tratamento de varizes com úlcera em atividade com laser endovenoso (EVL), comparando com um grupo sob tratamento clínico, durante um ano. Foram estudados 52 pacientes consecutivos portadores de varizes com úlcera em atividade há mais de um ano, divididos em dois grupos aleatór
Publicado em: 2007
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3. Caracterização espectroscópica de possíveis meios ativos para lasers de Nd3+ e Tm3+ / Spectroscopic characterization of possible Nd3+ and Tm3+ laser active media
In this work we have made an important contribution to the growing research of new laser materials that can be pumped by low cost diode lasers or by the Upconversion process to operate in the near-infrared and visible spectral regions. Three kinds of hosts, doped with the rare earth ions (Nd3+ and Tm3+) were studied, and they present potential characteristic
Publicado em: 2003
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4. Laser de argonio excitado por descarga tipo theta-pinch
In spite of theta-pinches have been widely used in controlled nuclear fusion research,by the best of our knowledge, such kind of device has never been used as excitation method for active media of lasers. In the present work, we described the project of a theta-pinch, in which a resonante cavity was installed, in order to transform it in a laser device. Argo
Publicado em: 1997
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5. Caracterização do LiNbO3:Er+3 como meio ativo para lasers de estado sólido através dos espectros de absorção/emissão polarizada e medida dos tempos de vida de luminescência. / Characterization of LiNbO3:Er+3 as active media for solid-state lasers through polarized absorption/ emission spectra and measurements of luminescence lifetime.
This work consists in the optical characterization of LiNbO3:Er3+ single crystals, aiming to verify the possibility of this system being an active media for laser. The absorption and emission results were satisfactory, being compatible enough with the theoretical model adopted. The luminescence lifetime of the 4S3/2 - 4I15/2 e 4F9/2 - 4I15/2 transitions was
Publicado em: 1989
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6. Assessing the Role of Pseudomonas aeruginosa Surface-Active Gene Expression in Hexadecane Biodegradation in Sand
Low pollutant substrate bioavailability limits hydrocarbon biodegradation in soils. Bacterially produced surface-active compounds, such as rhamnolipid biosurfactant and the PA bioemulsifying protein produced by Pseudomonas aeruginosa, can improve bioavailability and biodegradation in liquid culture, but their production and roles in soils are unknown. In thi
American Society for Microbiology.
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7. Reversible Calcium-Regulated Stopcocks in Legume Sieve TubesW⃞
Sieve tubes of legumes (Fabaceae) contain characteristic P-protein crystalloids with controversial function. We studied their behavior by conventional light, electron, and confocal laser scanning microscopy. In situ, crystalloids are able to undergo rapid (<1 sec) and reversible conversions from the condensed resting state into a dispersed state, in which th
American Society of Plant Physiologists.