Tunable Laser
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties
We report on the synthesis of single-crystalline tellurium nanowires with different aspect-ratios prepared via facile surfactant-assisted synthesis under mild conditions. Short and long Te nanowires were synthesized by the reduction of tellurium dioxide by hypophosphorous acid with the assistance of polyoxyethylene (23) laurylether and cetyltrimethylammonium
J. Braz. Chem. Soc.. Publicado em: 2017-01
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2. Sistemas de sensores ópticos baseados em fibra óptica de perfil-W dopada com Érbio / Optical sensing systems based on Erbium-doped W-fiber
Depressed-cladding (often referred to as dual-clad or "W"- fiber) fibers with fundamental-mode cutoffs provide high distributed losses at long wavelengths and low losses at short wavelengths. The magnitude of the abrupt transition between low-loss at short wavelengths and high-loss at long wavelengths exceeds 200 dB/km and is found to be extremely sensitive
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/07/2012
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3. Geração de segundo harmônico sintonizável por modulação de fase de pulsos de laser ultracurtos / Tunable second harmonic generation by phase-modulated ultrashort laser pulses
Neste trabalho é feito um estudo da formatação de pulsos ultracurtos de laser de Ti:Safira para a geração de segundo harmônico em cristal de KDP. Para a formatação dos pulsos, é utilizado um aparato que inclui um modulador espacial de luz de cristal líquido (LC SLM), que altera unicamente a fase espectral dos pulsos. Este aparelho tem a vantagem de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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4. Photoassociative ionization in situations with low dimensions / Investigação do processo de foto-ionização associativa em situações com baixa dimensão
Photoassociative ionization (PAI) in a cold sample of sodium atoms was the main subject of our studies as a way to understand the effects of repulsive states and collision dimensions. Two-color PAI experiment were preformed in a magneto-optical trap (MOT) trough the addition of a probe laser beam, the intensity, polarization and frequency of that probe laser
Publicado em: 2009
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5. Efeitos coerentes no acoplamento dos lasers de fentosegundo e de diodo em vapor de rubÃdio
Mode-locked, phase-stabilized femtosecond (fs) lasers with high-repetition rate produce a frequency standard composed by a great number of narrow modes, known as frequency comb. The interaction of inhomogeneously broadened two-level systems with a train of fs pulses, for the case in which the atomic relaxation times are longer than the laser repetition perio
Publicado em: 2008
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6. Efeitos nÃo lineares em lÃquidos orgÃnicos e meios nanoestruturados
In this thesis, we report studies of nonlinear transverse effects in organic liquids, carbon disulfide (CS2) and dimetil sulfoxide (DMSO), and of fluorescent emission effects in nanostructured media, more specifically, frequency upconversion in erbium doped barium titanate nanocrystals (BaTiO3:Er3+) and laserlike emission from inverted opal nanostructure of
Publicado em: 2004
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7. Thermal effects on light emission in Yb3+-sensitized rare-earth doped optical glasses
The temperature effect upon infrared-to-visible frequency upconversion fluorescence emission in off-resonance infrared excited Yb3+-sensitized rare-earth doped optical glasses is theoretically and experimentally investigated. We have examined samples of Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glasses and germanosilicate optical fibers, and Ga2O3:La2O3 cha
Brazilian Journal of Physics. Publicado em: 2001-03
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8. Projeto e construção de um laser de Ti : safira continuo, sintonizavel, com frequencia unica e estabilizada a uma cavidade-externa de referencia / Project and construction of a cw, single-frequency and tunable Ti : Sapphire laser, actively stabilized to the resonance of an external reference cavity
Este trabalho apresenta o projeto e construção de um laser de Tirsafira (safira dopada com titânio) sintonizável, operando em regime contínuo, de freqüência única e estabilizada à ressonância de uma cavidade externa de referência. Descrevemos os componentes do laser: cristal de Ti:Safira, cavidade óptica em anel, diodo óptico, filtro birrefringe
Publicado em: 2001
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9. Espectroscopia não linear em cristais fluoretos e polianilina / Nonlinear spectroscopic characterization in fluoride crystals and polyaniline
In this work we studied the effect of nonlinear refraction in Cr+3 doped fluoride host crystals and polymers. The fluoride crystals have been attractive due a broad emission bandwidth and a tunable solid-state lasing in the range of approximately 780-1010 nm. Applying the Thermal Lens (TL) technique, we accomplished a quantitative study of the behavior of th
Publicado em: 2001
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10. GERAÇÃO DE PULSOS ÓPTICOS CURTOS SINTONIZÁVEIS EM COMPRIMENTO DE ONDA UTILIZANDO UM LASER A FIBRA EM ANEL / WAVELENGTH TUNABLE OPTICAL PULSES GENERATION USING FIBER LASERS
Neste trabalho, descreve-se a geração de pulsos ópticos curtos com diferentes taxas de repetição, para aplicações em sistemas de transmissão de sólitons. Para isto foi desenvolvido um laser a fibra em anel operando na terceira janela de comunicações ópticas (em 1.55 mm), capaz de gerar pulsos curtos, utilizando a técnica de mode-locking ativo. N
Publicado em: 2000
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11. ATOMIC FLUORESCENCE SPECTROSCOPIC METHODS FOR ULTRATRACE ELEMENTAL ANALYSIS USING A HIGH- REPETITION RATE TUNABLE DYE LASER AND FURNACE SAMPLE ATOMIZATION
The goal of this work was to develop ultrasensitive methods based on Electrothermal atomization laser-excited atomic fluorescence (ETA-LEAFS) to determine Ge, In, Pb, Pt and Tm in complex samples such as biological and environmental. The ultimate goal was to achieve high sensitivity and high selectivity with little sample manipulation and simple sample calib
Publicado em: 1999
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12. Aplicação de grades transientes de população a espectroscopia de estados excitados de materiais
We have measured the excited state spectra of two organic dyes, Nile Blue and Rhodamine 640 and two semiconductor doped glasses of the type CdSxSe1-x (Corning Color Filters), CS-2.59 and CS-2.61, using a transient population grating technique. The grating was obtained through the spatial modulation of the energy level populations induced by an interfference
Publicado em: 1992