Photophysics of Polyatomic Species Ejection Following UV Laser Ablation of Single Crystal Bi2Sr2Ca1Cu2O8

1991 ◽  
Vol 235 ◽  
Author(s):  
Lawrence Wiedeman ◽  
Hyun-Sook Kim ◽  
Henry Helvajian
Keyword(s):  
Laser Ablation ◽  
Gas Phase ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Film Material ◽  
Uv Laser ◽  
Surface Plasma ◽  
Laser Fluences ◽  
Series Of Experiments ◽  
Large Clusters

ABSTRACTA series of experiments have been conducted which probe the origin of the polyatomic ions (e.g., Sr2O+, BiCu+) measured following the low fluence, pulsed UV laser irradiation of crystalline Bi2Sr2CaCu2O8 (BiSrCaCuO). The photoejection of polyatomic species presents a problem for the pulsed laser deposition (PLD) technique. The deposition of polyatomic products could limit epitaxial growth during thin film material processing. Our results indicate that the polyatomic species are not the consequence of a gas phase recombination, but are in fact directly produced. All experiments are done at laser fluences below that required for above surface plasma formation. As such, our results do not address the formation of large clusters within the dense plume in high fluence laser ablation.

Photophysics of Polyatomic Species Ejection Following Uv Laser Ablation of Single Crystal Bi2Sr2Ca1Cu2O8

1991 ◽  
Vol 236 ◽  
Author(s):  
Lawrence Wiedeman ◽  
Hyun-Sook Kim ◽  
Henry Helvajian
Keyword(s):  
Laser Ablation ◽  
Gas Phase ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Film Material ◽  
Uv Laser ◽  
Surface Plasma ◽  
Laser Fluences ◽  
Series Of Experiments ◽  
Large Clusters

AbstractA series of experiments have been conducted which probe the origin of the polyatomic ions (e.g., Sr2O+, BiCu+) measured following the low fluence, pulsed UV laser irradiation of crystalline Bi2Sr2CaCu2O8 (BiSrCaCuO). The photoejection of polyatomic species presents a problem for the pulsed laser deposition (PLD) technique. The deposition of polyatomic products could limit epitaxial growth during thin film material processing. Our results indicate that the polyatomic species are not the consequence of a gas phase recombination, but are in fact directly produced. All experiments are done at laser fluences below that required for above surface plasma formation. As such, our results do not address the formation of large clusters within the dense plume in high fluence laser ablation.

Laser ablation mass spectrometry: a tool to investigate matter transfer processes during pulsed-laser deposition experiments

2002 ◽  
Vol 186 (1-4) ◽  
pp. 282-287 ◽  
Author(s):  
Frédéric Aubriet ◽  
Nouari Chaoui ◽  
Rachel Chety ◽  
Benoı̂t Maunit ◽  
Eric Millon ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Transfer Processes ◽  
Matter Transfer

Quantum Confinement of GaAs Nanocrystals Deposited on PMMA Microspheres Using Pulsed Laser Ablation

2013 ◽  
Vol 660 ◽  
pp. 3-9
Author(s):  
Jeong Ho Ryu ◽  
Soon Yong Kweon ◽  
Jung Il Lee ◽  
Sung Lim Ryu
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser Deposition ◽  
Quantum Confinement ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Average Diameter ◽  
Laser Deposition ◽  
Spherical Particles ◽  
Novel Approach

A modified pulsed laser deposition (PLD) was employed to deposit GaAs nanocrystals on the surface of PMMA microspheres. This novel approach is distinguished by the fact that laser ablated materials are deposited uniformly onto the surface of spherical particles that are held constantly in a particle fludization unit. The XRD, SEM, EDX, TEM, EDP and PL results confirmed that cubic structured GaAs nanocrystals were deposited uniformly on the surface of PMMA microspheres with an average diameter of about 15 nm.

THE TARGET MORPHOLOGY DURING PULSED LASER DEPOSITION OF HYDROXYAPATITE THIN FILMS

2005 ◽  
Vol 12 (04) ◽  
pp. 539-543 ◽  
Author(s):  
QUANHE BAO ◽  
CHUANZHONG CHEN ◽  
LUBIN CHEN ◽  
DIANGANG WANG ◽  
TINGQUAN LEI ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
The Other ◽  
Laser Deposition ◽  
Grain Structure ◽  
Before And After ◽  
Modified Surface ◽  
Modified Surface Layer

A modified surface layer of hydroxyapatite (HA) target was observed before and after pulsed laser deposition. Two types of HA targets were used for laser ablation. We observed that the surface morphology of the target has a very fine compacted grain structure and presents many irregularities with some microroughness and microporosity before laser ablation. The laser ablated regions can be divided into two areas: one area is porous and rough but the other is dense and smooth. The percentage of particles in the films was high for the films produced with targets that were sintered at 1200°C.

Pulsed laser ablation of MoSi2: gas phase analysis

2002 ◽  
Vol 186 (1-4) ◽  
pp. 335-338 ◽  
Author(s):  
R. Teghil ◽  
L. D’Alessio ◽  
A. Santagata ◽  
M. Zaccagnino ◽  
D. Ferro
Keyword(s):  
Laser Ablation ◽  
Gas Phase ◽  
Phase Analysis ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation

DEPOSITION OF (Ba, La)CuO2/CaCuO2 SUPERCONDUCTING MULTILAYERS BY PULSED LASER ABLATION

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2713-2718 ◽  
Author(s):  
V. BRACCINI ◽  
D. MARRE' ◽  
A. MOLLICA ◽  
G. GRASSANO ◽  
A. S. SIRI
Keyword(s):  
Laser Ablation ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Laser Deposition ◽  
High Oxygen Partial Pressure ◽  
Infinite Layer ◽  
Deposition Parameters ◽  
Semiconducting Behavior

Superconducting multilayers, whose growth and structure are determined by the kinetic deposition instead by thermodynamics, are a powerful tool for investigating high T c superconductors (HTSC) properties. By means of Pulsed Laser Deposition (PLD), we grew such materials alternating infinite layer phases both pure and doped, to supply CuO 2 planes and charge reservoir (CR) blocks respectively. We found out that using chemically doped CR leads to a semiconducting behavior, whereas oxygen doping seems to be much more effective, since the BaCuO 2 infinite phase, grown in high oxygen partial pressure, does actually bring about a superconducting behavior. We deposited BaCuO 2/ CaCuO 2 superlattices with various periodicities and studied their transport and structural properties. By varying the deposition parameters, we reached both kinetic and thermodynamic growth and we observed semiconducting and superconducting behaviors.

scholarly journals Dynamics of Transient Plasmas Generated by ns Laser Ablation of Memory Shape Alloys

2020 ◽  
Author(s):  
Stefan Andrei Irimiciuc ◽  
Norina Forna ◽  
Andrei Agop ◽  
Maricel Agop ◽  
Stefan Toma ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser Deposition ◽  
Emission Spectroscopy ◽  
Pulsed Laser ◽  
Optical Emission ◽  
Laser Deposition ◽  
Global Dynamics ◽  
Time Resolved ◽  
Laser Ablation Process ◽  
Key Techniques

Understanding the underline fundamental mechanism behind experimental and industrial technologies embodies one of the foundations of the advances and tailoring new materials. With the pulsed laser deposition being one of the key techniques for obtaining complex biocompatible materials with controllable stoichiometry, there is need for experimental and theoretical advancements towards understanding the dynamics of multi component plasmas. Here we investigate the laser ablation process on Cu-Mn-Al and Fe-Mn-Si by means of space-and time-resolved optical emission spectroscopy and fast camera imaging. In a fractal paradigm the space–time homographic transformations were correlated with the global dynamics of the ablation plasmas.

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