scholarly journals Study of Surface Damage caused by Laser Irradiation for Quantitative Hydrogen Analysis in Zircaloy using Laser-induced Plasma Breakdown Spectrometry

2009 ◽  
Author(s):  
K. Fukumoto ◽  
N. Yamada ◽  
H. Niki ◽  
T. Maruyama ◽  
K. Kagawa ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Surface Damage ◽  
Laser Induced Plasma ◽  
Hydrogen Analysis ◽  
Plasma Breakdown

Surface damage morphology investigations of silicon under millisecond laser irradiation

2010 ◽  
Vol 257 (5) ◽  
pp. 1583-1588 ◽  
Author(s):  
X. Wang ◽  
D.H. Zhu ◽  
Z.H. Shen ◽  
J. Lu ◽  
X.W. Ni
Keyword(s):  
Laser Irradiation ◽  
Surface Damage ◽  
Damage Morphology ◽  
Millisecond Laser

Laser Irradiation of Ge(100): An Assessment of Surface Order with He Diffraction

1984 ◽  
Vol 35 ◽  
Author(s):  
W. R. Lambert ◽  
P. L. Trevor ◽  
M. T. Schulberg ◽  
M. J. Cardillo ◽  
J. C. Tully
Keyword(s):  
Laser Irradiation ◽  
Excimer Laser ◽  
Low Temperatures ◽  
Thermal Response ◽  
Surface Damage ◽  
Experimental Results ◽  
Excimer Laser Irradiation ◽  
Effects Of Irradiation On ◽  
He Atom

ABSTRACTWe investigate the effects of Nd:YAG and excimer laser irradiation on the Ge(100) surface under UHV conditions over a temperature range 140 < T(K) < 300 using the surface sensitive probe of He atom diffraction. We study the effects of irradiation on surface damage and order using the apparent (2×1) ࢐ c(2×4) transition. We monitor surface contamination in situ. The temporal thermal response is modeled theoretically to aid in assessing the experimental results. The capability to maintain a Ge(100) surface at low temperatures free of contamination and well ordered is demonstrated.

scholarly journals On the measurement of laser-induced plasma breakdown thresholds

2013 ◽  
Vol 114 (9) ◽  
pp. 093101 ◽  
Author(s):  
Stefan Brieschenk ◽  
Harald Kleine ◽  
Sean O'Byrne
Keyword(s):  
Laser Induced Plasma ◽  
Plasma Breakdown

Surface damage and thin nitride and carbide films produced on molybdenum by laser irradiation

1986 ◽  
Vol 53 (5) ◽  
pp. 653-665 ◽  
Author(s):  
M. Yamaguchi ◽  
Y. Umakoshi ◽  
C. Yamanaka ◽  
T. Yamane ◽  
M. Nakatsuka ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Surface Damage

Ablation Characteristics of Nanosecond Laser Pulsed Ablation of Aluminum

2018 ◽  
Author(s):  
Yeqing Wang ◽  
Daniel Diaz ◽  
David W. Hahn
Keyword(s):  
Laser Ablation ◽  
Spectroscopic Analysis ◽  
Pulsed Laser ◽  
Surface Damage ◽  
Nanosecond Laser ◽  
White Light Interferometry ◽  
Ablation Crater ◽  
Laser Induced Plasma ◽  
Nanosecond Pulsed Laser ◽  
Ablation Characteristics

This research presents laser ablation characteristics of an aluminum alloy after nanosecond pulsed laser ablation (PLA) with a 1064 nm Nd:YAG laser. White light interferometry and scanning electron microscopy were used to establish relationships between laser ablation characteristics and the number of pulses at different beam energies. Laser ablation features studied in this research are crater profiles, radii and depth, and extent of surface damage. An extensive damaged area around the laser ablation crater was found and is believed to be produced by the laser-induced plasma generated during PLA. Spectroscopic analysis showed that there is a correlation between the plasma formation threshold and the initiation of the plasma-affected area, and laser ablation at different angles of incidence between the beam and the sample showed a correlation between the plasma shape and the shape of the damaged area around the ablation crater. However, the variables influencing the occurrence of the plasma-affected and the extent of plasma-induced damage are not yet fully recognized and understood.

FEM Simulation of Laser-Induced Plasma Breakdown Experiments for Combustion Applications

2017 ◽  
Author(s):  
Andrea Alberti ◽  
Alessandro Munafò ◽  
Amal Sahai ◽  
Carlos Pantano ◽  
Marco Panesi
Keyword(s):  
Fem Simulation ◽  
Laser Induced Plasma ◽  
Plasma Breakdown

Surface Structure in Microtomed Sections Caused by Glass and Diamond Knives

1971 ◽  
Vol 29 ◽  
pp. 456-457
Author(s):  
J. Temple Black ◽  
William G. Boldosser
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Carbon Coating ◽  
Surface Damage ◽  
Body Angle ◽  
Normal Manner ◽  
Bottom Side ◽  
Cutting Direction ◽  
Made In ◽  
Diamond Knife

Ultramicrotomy produces plastic deformation in the surfaces of microtomed TEM specimens which can not generally be observed unless special preparations are made. In this study, a typical biological composite of tissue (infundibular thoracic attachment) infiltrated in the normal manner with an embedding epoxy resin (Epon 812 in a 60/40 mixture) was microtomed with glass and diamond knives, both with 45 degree body angle. Sectioning was done in Portor Blum Mt-2 and Mt-1 microtomes. Sections were collected on formvar coated grids so that both the top side and the bottom side of the sections could be examined. Sections were then placed in a vacuum evaporator and self-shadowed with carbon. Some were chromium shadowed at a 30 degree angle. The sections were then examined in a Phillips 300 TEM at 60kv.Carbon coating (C) or carbon coating with chrom shadowing (C-Ch) makes in effect, single stage replicas of the surfaces of the sections and thus allows the damage in the surfaces to be observable in the TEM. Figure 1 (see key to figures) shows the bottom side of a diamond knife section, carbon self-shadowed and chrom shadowed perpendicular to the cutting direction. Very fine knife marks and surface damage can be observed.

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Microstructural changes of Aluminum Nitride after laser irradiation and electroless copper deposition

1994 ◽  
Vol 52 ◽  
pp. 636-637
Author(s):  
S. Cao ◽  
A. J. Pedraza ◽  
L. F. Allard
Keyword(s):  
Aluminum Nitride ◽  
Laser Irradiation ◽  
Electroless Deposition ◽  
Thermal Evaporation ◽  
Surface Region ◽  
Near Surface ◽  
Laser Patterning ◽  
Electroless Copper ◽  
Excimer Laser Irradiation ◽  
Laser Effect

Excimer-laser irradiation strongly modifies the near-surface region of aluminum nitride (AIN) substrates. The surface acquires a distinctive metallic appearance and the electrical resistivity of the near-surface region drastically decreases after laser irradiation. These results indicate that Al forms at the surface as a result of the decomposition of the Al (which has been confirmed by XPS). A computer model that incorporates two opposing phenomena, decomposition of the AIN that leaves a metallic Al film on the surface, and thermal evaporation of the Al, demonstrated that saturation of film thickness and, hence, of electrical resistance is reached when the rate of Al evaporation equals the rate of AIN decomposition. In an electroless copper bath, Cu is only deposited in laser-irradiated areas. This laser effect has been designated laser activation for electroless deposition. Laser activation eliminates the need of seeding for nucleating the initial layer of electroless Cu. Thus, AIN metallization can be achieved by laser patterning followed by electroless deposition.

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