A5074156985- Nonlinear Optical Materials Studies
- Nonlinear Optical Materials Research
- Laser-Matter Interactions and Applications
- Photochemistry and Electron Transfer Studies
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Porphyrin and Phthalocyanine Chemistry
- Photodynamic Therapy Research Studies
- Adaptive optics and wavefront sensing
- Gold and Silver Nanoparticles Synthesis and Applications
- Protein Interaction Studies and Fluorescence Analysis
- Photochromic and Fluorescence Chemistry
- Advanced Fluorescence Microscopy Techniques
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Molecular spectroscopy and chirality
- Phase-change materials and chalcogenides
- Spectroscopy and Quantum Chemical Studies
- Photorefractive and Nonlinear Optics
- Chalcogenide Semiconductor Thin Films
- Optical Systems and Laser Technology
- Glass properties and applications
- Optical Coatings and Gratings
Universidade de São Paulo
2016-2019
Universidade Federal de São Carlos
2016-2019
Excited state dynamics, particularly intersystem crossing, of a set meso-substituted porphyrins bearing different electron–donor and acceptor groups was studied by pulse train fluorescence technique. Triplet quantum yield found to be critically dependent on the nature meso-substituents in porphyrin system. Porphyrins with meso methoxyphenyl were show high triplet yields ([Formula: see text] between 0.70 0.81). Moreover, quantity substitution pattern directly influence [Formula: text]....
Abstract Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS) is a first-light moderate-dispersion imaging spectrograph under development at the Center for Astrophysics Steiner Institute Telescope. GMACS operates between 330 1050 nm with resolution 1000 < R 5000 using 0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>.</mml:mi> </mml:mrow> <mml:mi>″</mml:mi> </mml:mover>...
We investigated the magnitude and origin of nonlinear refraction in several solvents with ellipse rotation measurements as a function pulse duration range from 60fs to 2ps. Due presence non-instantaneous nuclear contributions concurrently nearly instantaneous electronic nonlinearity, present effective refractive nonlinearities that depend on duration. By proposing an empirical model where nonlinearity grows exponentially normalized response time, we could separate fast isotropic slow...
We investigated how the Z-scan technique can be explored to distinguish two types of nonlinear refractive effects by employing distinct laser polarizations. It is possible that pure electronic, molecular orientation and thermal may occur simultaneously during light-matter interaction. found a way discriminate quantify processes from signals measured with linear circular This paper provides analytical equations for refractions in order test them, we carried out measurements CS2 rhodamine-B...
We investigated the contribution of molecular orientation nonlinearity to nonlinear ellipse rotation (NER) effect. There is an enhancement 2.25 when this process compared pure electronic third-order effects. NER measurements were performed with picosecond laser pulses in SF6 glass and CS2 that respectively present mostly orientational nonlinearities. A Z-scan was also probe Kerr-lens signal. The effect can be understood by taking into account tensor nature susceptibility.
Nonlinear refractive indices of air and its constituents were measured as a function the pulse width in capillary used to confine gas increase interaction length. This study was carried out with nonlinear ellipse rotation measurements using an amplified Ti:sapphire laser system providing pulses at 800 nm, continuously tunable from ∼60 fs up ∼3 ps. Due presence noninstantaneous orientational response, nonlinearities molecular gases strongly depend on width. The dependence discrimination...
We have identified strong influence of pulse width in the nonlinear refractive index, n2, gases due to contribution noninstantaneous response. Using 50fs-1.2ps pulses, n2 values were determined by ellipse rotation measurements.
We investigate the contribution of noninstantaneous response time organic solvents nonlinearities by measuring nonlinear refractive indices with ellipse rotation method as a function pulse width, which was spanned from 50fs to ~700fs.
Different nonlinear optical processes may occur during light-matter interaction such as electronic, orientational and thermal. We investigated polarization-resolved Z-scan to distinguish two of these occurring simultaneously. Analytical equations were derived quantify the contributions.