Effect of the temporal pulse duration on the initiation of damage sites on fused silica surfaces

2008 ◽  
Author(s):  
B. Bertussi ◽  
P. Cormont ◽  
S. Palmier ◽  
G. Gaborit ◽  
L. Lamaignere ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Fused Silica ◽  
Silica Surfaces ◽  
Temporal Pulse

scholarly journals The effect of pulse duration on the growth rate of laser-induced damage sites at 351 nm on fused silica surfaces

2009 ◽  
Author(s):  
R. A. Negres ◽  
M. A. Norton ◽  
Z. M. Liao ◽  
D. A. Cross ◽  
J. D. Bude ◽  
...  
Keyword(s):  
Growth Rate ◽  
Pulse Duration ◽  
Fused Silica ◽  
Silica Surfaces ◽  
Laser Induced Damage

scholarly journals Quantification of Carbonic Contamination of Fused Silica Surfaces at Different Stages of Classical Optics Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1620
Author(s):  
Robert Köhler ◽  
Domenico Hellrung ◽  
Daniel Tasche ◽  
Christoph Gerhard
Keyword(s):  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Decisive Role ◽  
Fused Silica ◽  
Process Step ◽  
Carbon Contamination ◽  
Silica Surfaces ◽  
Carbon Impurities ◽  
High Level ◽  
Glass Surfaces

The chemical composition of ground and polished fused silica glass surfaces plays a decisive role in different applications of optics. In particular, a high level of carbon impurities is often undesirable for further processing and especially for gluing or cementing where adhesion failure may be attributed to carbonic surface-adherent contaminants. In this study, the surface carbon content at different stages of classical optics manufacturing was thus investigated. Two different standard processes—grinding and lapping with two final polishing processes using both polyurethane and pitch pads—were considered. After each process step, the chemical composition and roughness of the surface were analysed using X-ray photoelectron spectroscopy and atomic force microscopy. An obvious correlation between surface roughness and effective surface area, respectively, and the proportion of carbon contamination was observed. The lowest carbon contamination was found in case of lapped and pitch polished surfaces.

scholarly journals Monitoring annealing via CO_2 laser heating of defect populations on fused silica surfaces using photoluminescence microscopy

2010 ◽  
Vol 18 (14) ◽  
pp. 15207 ◽  
Author(s):  
Rajesh N. Raman ◽  
Manyalibo J. Matthews ◽  
John J. Adams ◽  
Stavros G. Demos
Keyword(s):  
Laser Heating ◽  
Fused Silica ◽  
Silica Surfaces ◽  
Photoluminescence Microscopy

scholarly journals Combined laser and magnetic field treatment of YFeO3—containing films grown by spray-pyrolysis

2004 ◽  
Vol 2 (1) ◽  
pp. 188-195
Author(s):  
N. Mihailov ◽  
O. Vankov ◽  
N. Petrova ◽  
D. Kovacheva
Keyword(s):  
Magnetic Field ◽  
Spray Pyrolysis ◽  
Pulse Duration ◽  
Fused Silica ◽  
Crystallite Sizes ◽  
Citric Complexes ◽  
Magnetic Field Treatment ◽  
Glycol Solution ◽  
The Magnetic Field ◽  
Post Deposition

AbstractThin films (50–1200 nm) of YFeO3 were deposited on fused silica substrates by spray-pyrolysis using ethylene glycol solution of Y-Fe(III) citric complexes. The films were post deposition annealed at 750°C in static air for 2 h. Films obtained in this way were afterwards irradiated by a burst mode operated Nd-YAG laser (pulse energy 650 mJ, pulse duration 700 μs, energy density 110 mJ/cm2). The laser’s onset was synchronized with that of a magnetic field pulse of nearly square shape (magnetic induction 0.5 T, pulse duration 900 μs). The samples were placed normally to the direction of the magnetic field. The treatment does not affect the phase composition of the film but significantly increases the crystallite sizes of the phases presenting in the sample. The saturation magnetization of the films decreases as a result of the laser and magnetic field treatment and the coercive force increases by 50%.

Pulse duration dependence of ablation threshold for fused silica in the visible femtosecond regime

2020 ◽  
Vol 126 (6) ◽  
Author(s):  
E. Terasawa ◽  
T. Shibuya ◽  
D. Satoh ◽  
Y. Moriai ◽  
H. Ogawa ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Ablation Threshold ◽  
Fused Silica ◽  
Duration Dependence ◽  
Femtosecond Regime

Multipulse degradation of fused silica surfaces at 351 nm

2015 ◽  
Author(s):  
Sonny Ly ◽  
Ted A. Laurence ◽  
Nan Shen ◽  
Bill Hollingsworth ◽  
Mary Norton ◽  
...  
Keyword(s):  
Fused Silica ◽  
Silica Surfaces

The Dilemma of Anomalous X-Ray Reflections

1966 ◽  
Vol 10 ◽  
pp. 108-117
Author(s):  
James F. McGee ◽  
Veil I. Olli
Keyword(s):  
Focal Plane ◽  
Plane Surface ◽  
Fused Silica ◽  
X Rays ◽  
Periodic Surface ◽  
Silica Surfaces ◽  
Periodic Surface Structure ◽  
Surface Irregularities ◽  
The Common ◽  
Soller Slit

AbstractThat X-rays focused by reflection from concave surfaces exhibit anomalous image broadening was shown by Ehrenberg using a line source. Even flat nonfocusing surfaces of many different materials produced an anomalous striated reflection. According to Ehrenbevg, the common cause for the observed broadening in the focused image and the striated pattern in the nonfocused reflection is a periodic surface structure. In later years, Eliot, using a point source of X-rays reflected from a concave surface, observed a striated pattern at a position well beyond the focal plane. It is to be noted that Eliot's experiment combined elements of Ehrenberg's two experiments—a focusing surface and observations made far from any focal plane, real or virtual. Eliot observed his striations with fused silica surfaces but not with obsidian. Recently, Yoneda, using X-rays collimated by a Soller slit and incident on a plane surface, observed an anomalous line reflection not previously reported.Various experiments performed by the present authors have attempted to duplicate some of the above situations as closely as possible, either directly with X-rays or in an analogous manner with visibic light. It will be shown that satisfactory explanations can be formulated from previously unsuspected diffraction phenomena, recently confirmed by experiment as well as by a simple experimental oversight. In spite of the dilemma presented, either horn eliminates all previous limitations due to surface conditions, so that the tolerable surface roughness is once again determined by the well-known Rayleigh criterion rather than by any periodic surface irregularities introduced through the polishing process or by nature.

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