Uv Excimer Laser-Induced Deposition of Palladium from Palladium Acetate Films

1989 ◽  
Vol 158 ◽  
Author(s):  
Hilmar Esrom ◽  
Georg Wahl
Keyword(s):  
Simple Model ◽  
Aluminum Oxide ◽  
Excimer Laser ◽  
Pulse Energy ◽  
Laser Pulses ◽  
Palladium Acetate ◽  
Induced Decomposition ◽  
Quartz Substrates ◽  
Exposure Process

ABSTRACTUV excimer laser-induced deposition of palladium from spin coated palladium acetate films in air is described. We have investigated mainly the deposition of palladium on aluminum oxide and quartz substrates and its dependence on the fluence and the number of excimer laser pulses. The decomposition mechanism was studied by measuring in situ the transmitted pulse energy during the exposure process. We have found that the excimer laser-induced decomposition of palladium acetate films is mainly pyrolytic and a simple model can be used to describe the decomposition process.

Picosecond UV Excimer Laser Ablation of LiNbO3

1990 ◽  
Vol 191 ◽  
Author(s):  
Th. Beuermann ◽  
H. J. Brinkmann ◽  
T. Damm ◽  
M. Stuke
Keyword(s):  
Laser Ablation ◽  
Simple Model ◽  
Lithium Niobate ◽  
Excimer Laser ◽  
Material Removal ◽  
Etch Rate ◽  
Laser Pulses ◽  
Picosecond Pulses ◽  
Excimer Laser Ablation ◽  
Order Of Magnitude

ABSTRACTUltrashort UV excimer laser ablation of materials shows several advantages over conventional UV excimer laser ablation. We describe new experimental results on lithium niobate, LiNbO3, using 308 nm pulses of 1 ps duration. The fluence threshold for material removal is reduced by one order of magnitude when compared with 16 ns pulses at 308 nm. In addition the etch rate is up to three times higher for picosecond pulses and it is independent of the diameter of the ablation area. We discuss a simple model describing the etching and ablation behaviour of materials upon interaction with UV excimer laser pulses of different pulse duration.

scholarly journals Measuring the frequency chirp of extreme-ultraviolet free-electron laser pulses by transient absorption spectroscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Thomas Ding ◽  
Marc Rebholz ◽  
Lennart Aufleger ◽  
Maximilian Hartmann ◽  
Veit Stooß ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Ultrashort Pulses ◽  
Laser Pulses ◽  
Transient Absorption Spectroscopy ◽  
Energy Structure ◽  
Frequency Chirp

AbstractHigh-intensity ultrashort pulses at extreme ultraviolet (XUV) and x-ray photon energies, delivered by state-of-the-art free-electron lasers (FELs), are revolutionizing the field of ultrafast spectroscopy. For crossing the next frontiers of research, precise, reliable and practical photonic tools for the spectro-temporal characterization of the pulses are becoming steadily more important. Here, we experimentally demonstrate a technique for the direct measurement of the frequency chirp of extreme-ultraviolet free-electron laser pulses based on fundamental nonlinear optics. It is implemented in XUV-only pump-probe transient-absorption geometry and provides in-situ information on the time-energy structure of FEL pulses. Using a rate-equation model for the time-dependent absorbance changes of an ionized neon target, we show how the frequency chirp can be directly extracted and quantified from measured data. Since the method does not rely on an additional external field, we expect a widespread implementation at FELs benefiting multiple science fields by in-situ on-target measurement and optimization of FEL-pulse properties.

Excimer Laser In Situ Keratomileusis Under a Corneal Flap for Myopia of 2 to 20 Diopters

1996 ◽  
Vol 121 (2) ◽  
pp. 143-155 ◽  
Author(s):  
TAREK SALAH ◽  
GEORGE O. WARING ◽  
AKEF El MAGHRABY ◽  
KEN MOADEL ◽  
SUZAN B. GRIMM
Keyword(s):  
Excimer Laser ◽  
Laser In Situ Keratomileusis

Shortening of excimer laser pulses with saturable absorbers

1984 ◽  
Vol 52 (3) ◽  
pp. 211-214 ◽  
Author(s):  
Ch.G. Christov ◽  
I.V. Tomov ◽  
I.V. Chaltakov ◽  
V.L. Lyutskanov
Keyword(s):  
Excimer Laser ◽  
Laser Pulses ◽  
Saturable Absorbers

scholarly journals Flow fields associated with in situ mineral leaching

1994 ◽  
Vol 36 (2) ◽  
pp. 133-151 ◽  
Author(s):  
Lawrence K. Forbes ◽  
Anthony M. Watts ◽  
Graeme A. Chandler
Keyword(s):  
Simple Model ◽  
Free Boundary ◽  
Numerical Method ◽  
Flow Rate ◽  
Recovery Rate ◽  
Flow Fields ◽  
Vertical Line ◽  
Rate Limiting ◽  
Mineral Leaching

AbstractA simple model for underground mineral leaching is considered, in which liquor is injected into the rock at one point and retrieved from the rock by being pumped out at another point. In its passage through the rock, the liquor dissolves some of the ore of interest, and this is therefore recovered in solution. When the injection and recovery points lie on a vertical line, the region of wetted rock forms an axi-symmetric plume, the surface of which is a free boundary. We present an accurate numerical method for the solution of the problem, and obtain estimates for the maximum possible recovery rate of the liquor, as a fraction of the injected flow rate. Limiting cases are discussed, and other geometries for fluid recovery are considered.

In situ excimer laser irradiation as cleaning tool for solid phase epitaxy of laser crystallized polycrystalline silicon thin films

2013 ◽  
Vol 210 (12) ◽  
pp. 2729-2735 ◽  
Author(s):  
Ingmar Höger ◽  
Thomas Schmidt ◽  
Anja Landgraf ◽  
Martin Schade ◽  
Annett Gawlik ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Irradiation ◽  
Excimer Laser ◽  
Polycrystalline Silicon ◽  
Solid Phase ◽  
Solid Phase Epitaxy ◽  
Silicon Thin Films ◽  
Excimer Laser Irradiation

Excimer Laser In Situ Keratomileusis to Correct Compound Myopic Astigmatism

1997 ◽  
Vol 13 (6) ◽  
pp. 511-520
Author(s):  
M Alaa El Danasoury ◽  
George O Waring ◽  
Akef El Maghraby ◽  
Kamal Mehrez
Keyword(s):  
Excimer Laser ◽  
Laser In Situ Keratomileusis ◽  
Myopic Astigmatism
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