Surface analysis by photoionization at very high laser intensities

1994 ◽  
Vol 12 (4) ◽  
pp. 2352-2356 ◽  
Author(s):  
C. H. Becker ◽  
J. S. Hovis
Keyword(s):  
Surface Analysis ◽  
High Laser ◽  
Very High

Observations on the Growth of YBa2Cu3O7 Thin Films at Very High Laser Fluences

1995 ◽  
Vol 388 ◽  
Author(s):  
Rand R. Biggers. ◽  
M. Grant Norton ◽  
I. Maartense ◽  
T.L. Peterson ◽  
E. K. Moser ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Surface ◽  
Chemical Vapor ◽  
Growth Conditions ◽  
Organic Chemical ◽  
High Fluences ◽  
Laser Fluences ◽  
High Laser ◽  
High Laser Fluences ◽  
Very High

AbstractThe pulsed-laser deposition (PLD) technique utilizes one of the most energetic beams available to form thin films of the superconducting oxide YBa2Cu3O7 (YBCO). IN this study we examine the growth of YBCO at very high laser fluences (25 to 40 J/cm2); a more typical fluence for PLD would be nearer to 3 J/cm2. the use of high fluences leads to unique film microstructures which, in some cases, appear to be related to the correspondingly higher moveabilities of the adatoms. Films grown on vicinal substrates, using high laser fluences, exhibited well-defined elongated granular morphologies (with excellent transition temperature, Tc, and critical current density, Jc). Films grown on vicinal substrates using off-axis magnetron sputtering, plasma-enhanced metal organic chemical vapor deposition (PE-MOCVD), or PLD at more typical laser fluences showed some similar morphologies, but less well-defined. Under certain growth conditions, using high laser fluences with (001) oriented substrates, the YBCO films can exhibit a mixture of a- and c-axis growth where both crystallographic orientations nucleate on the substrate surface at the same time, and grow in concert. the ratio of a-axis oriented to c-axis oriented grains is strongly affected by the pulse repetition rate of the laser.

Relativistic and ponderomotive self-focusing at laser–plasma interaction

1999 ◽  
Vol 61 (2) ◽  
pp. 263-273 ◽  
Author(s):  
FREDERICK OSMAN ◽  
REYNALDO CASTILLO ◽  
HEINRICH HORA
Keyword(s):  
Refractive Index ◽  
Laser Plasma ◽  
Laser Intensity ◽  
Relativistic Effects ◽  
Electron Motion ◽  
Nonlinear Plasma ◽  
Laser Plasma Interaction ◽  
Self Focusing ◽  
High Laser ◽  
Very High

The nonlinear plasma dielectric function due to relativistic electron motion is derived. From this, one can obtain the nonlinear refractive index of the plasma and estimate the importance of relativistic self-focusing in comparison with ponderomotive non-relativistic self-focusing at very high laser intensities. When the laser intensity is very high, ponderomotive self-focusing will be dominant. However, at some point, when the oscillating velocity of the plasma electrons becomes very large, relativistic effects will also play a role in self-focusing.

Multiphoton Ionization of Rare Gases at Very High Laser Intensity (1015W/cm2) by a 30-psec Laser Pulse at 1.06 μm

1976 ◽  
Vol 36 (16) ◽  
pp. 949-952 ◽  
Author(s):  
L. A. Lompre ◽  
G. Mainfray ◽  
C. Manus ◽  
S. Repoux ◽  
J. Thebault
Keyword(s):  
Laser Pulse ◽  
Laser Intensity ◽  
Multiphoton Ionization ◽  
Rare Gases ◽  
High Laser ◽  
Very High ◽  
High Laser Intensity

A low-wavenumber-extended confocal Raman microscope with very high laser excitation line discrimination

2011 ◽  
Vol 82 (1) ◽  
pp. 013705 ◽  
Author(s):  
Sergei Lebedkin ◽  
Carolin Blum ◽  
Ninette Stürzl ◽  
Frank Hennrich ◽  
Manfred M. Kappes
Keyword(s):  
Laser Excitation ◽  
High Laser ◽  
Excitation Line ◽  
Confocal Raman ◽  
Very High
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