scholarly journals Synchrotron radiation infrared microscopic study of non-bridging oxygen modes associated with laser-induced breakdown of fused silica

2011 ◽  
Vol 99 (15) ◽  
pp. 151109 ◽  
Author(s):  
Manyalibo J. Matthews ◽  
Christopher W. Carr ◽  
Hans A. Bechtel ◽  
Rajesh N. Raman
Keyword(s):  
Synchrotron Radiation ◽  
Microscopic Study ◽  
Fused Silica ◽  
Laser Induced Breakdown

Optical defects produced in fused silica during laser-induced breakdown

2003 ◽  
Vol 82 (19) ◽  
pp. 3230-3232 ◽  
Author(s):  
S. O. Kucheyev ◽  
S. G. Demos
Keyword(s):  
Fused Silica ◽  
Laser Induced Breakdown

scholarly journals Comparison of material response in fused silica and KDP following exit surface laser- induced breakdown

2013 ◽  
Author(s):  
Stavros G. Demos ◽  
Raluca A. Negres ◽  
Rajesh N. Raman ◽  
Alexander M. Rubenchik ◽  
Michael D. Feit
Keyword(s):  
Fused Silica ◽  
Material Response ◽  
Exit Surface ◽  
Laser Induced Breakdown ◽  
Surface Laser

scholarly journals Role of phase instabilities in the early response of bulk fused silica during laser-induced breakdown

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
P. DeMange ◽  
R. A. Negres ◽  
R. N. Raman ◽  
J. D. Colvin ◽  
S. G. Demos
Keyword(s):  
Early Response ◽  
Fused Silica ◽  
Laser Induced Breakdown ◽  
Phase Instabilities

scholarly journals Investigation of Non-Uniformity of Classically-Polished Fused Silica Surfaces via Laser-Induced Breakdown Spectroscopy

2019 ◽  
Vol 215 ◽  
pp. 08003
Author(s):  
Christoph Gerhard ◽  
Jörg Hermann
Keyword(s):  
Optical Properties ◽  
Chemical Composition ◽  
Fused Silica ◽  
Laser Induced Breakdown Spectroscopy ◽  
Aluminium Content ◽  
Breakdown Spectroscopy ◽  
Silica Surfaces ◽  
Laser Induced Breakdown ◽  
High Aluminium

In this contribution, the surface uniformity of classically-manufactured fused silica windows was investigated via laser-induced breakdown spectroscopy. It is shown that for all investigated samples a comparatively high aluminium content was found at the edge of the surface with respect to its centre. This contamination can be attributed to residues from lapping and polishing agents and leads to a mentionable non-uniformity of the surface in terms of chemical composition and optical properties, respectively.

Material response during nanosecond laser induced breakdown inside of the exit surface of fused silica

2013 ◽  
Vol 7 (3) ◽  
pp. 444-452 ◽  
Author(s):  
Stavros G. Demos ◽  
Raluca A. Negres ◽  
Rajesh N. Raman ◽  
Alexander M. Rubenchik ◽  
Michael D. Feit
Keyword(s):  
Fused Silica ◽  
Nanosecond Laser ◽  
Material Response ◽  
Exit Surface ◽  
Laser Induced Breakdown

Qualitative and Semiquantitative Determination of the Atomic and Molecular Tungsten Distributions in Hybrid Hydroxyurethanes–Poly(dimethylsiloxane) Films Containing Phosphotungstates ([PW12O40]3–)

2020 ◽  
Vol 74 (12) ◽  
pp. 1515-1529
Author(s):  
Orlando Elguera Ysnaga ◽  
Kelen M.F. Rossi de Aguiar ◽  
Cibele Bugno Zamboni ◽  
Wagner Luiz Polito ◽  
Ubirajara P. Rodrigues-Filho
Keyword(s):  
Synchrotron Radiation ◽  
High Performance ◽  
Organic Matrix ◽  
Grazing Incidence ◽  
Distribution Patterns ◽  
Fiber Reinforced Polymers ◽  
Photochromic Properties ◽  
X Ray ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

In this study, hybrid poly(dimethylsiloxane)-derived hydroxyurethanes films (PDMSUr-PWA) containing phosphotungstic acid (H3PW12O40/PWA) were characterized using field emission gun scanning electron microscopy (FEG-SEM), in attenuated total reflectance Fourier transform mid-infrared mode (ATR FT-MIR), and analyzed using synchrotron radiation micro-X-ray fluorescence (SR-μXRF), synchrotron radiation grazing incidence X-ray fluorescence (SR-GIXRF), laser-induced breakdown spectroscopy (LIBS), and instrumental neutron activation analysis (NAA) in order to correlate the distribution patterns of tungsten and properties of PDMSUr-PWA films. PDMS constitute elastomers with good mechanical, thermal, and chemical (hydrophobicity/non-hygroscopy) resistance. Currently, products based on urethanes (e.g., polyurethanes) are widely used in many applications as plastics, fiber-reinforced polymers, high-performance adhesives, corrosion-resistant coatings, photochromic films, among others. The possibility to combine inorganic and organic components can produce a hybrid material with unique properties. PWA has an important role as agent against the corrosion of steel surfaces in different media, besides exhibiting amazing catalytic and photochromic properties in these films. PWA kept its structure inside of these hybrid films through interactions between the organic matrix of PDMSUr and silanol from the inorganic part (organically modified silica), as was shown using ATR FT-MIR spectra. The FEG-SEM/SR-μXRF/wide-angle X-ray scattering (WAXS)/X-ray diffraction (XRD)/energy dispersive X-ray results proved the presence of PWA in the composition of domains of PDMSUr-PWA films. At PWA concentrations higher than 50 wt%/wt, tungsten segregation across the thickness is predominant, while that at PWA concentrations lower than 35 wt%/wt, tungsten segregation at surface is predominant. Inhomogeneities in the tungsten distribution patterns (at micrometric and millimetric level) may play an important role in the mechanical properties of these films (elastic modulus and hardness).

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