Gas breakdown by single similar 20 ps, 1$middot$06 $\mu$m and 0$middot$53 $\mu$m laser pulses

1974 ◽  
Vol 7 (8) ◽  
pp. L87-L90 ◽  
Author(s):  
C L M Ireland ◽  
C Grey Morgan
Keyword(s):  
Laser Pulses ◽  
Gas Breakdown

Comparison of Laser-Ceramic and Laser-Metal Material Processing

2000 ◽  
Author(s):  
G. Deng ◽  
M. H. Gordon ◽  
L. A. Roe ◽  
A. P. Malshe ◽  
W. F. Schmidt
Keyword(s):  
Early Stage ◽  
Laser Pulses ◽  
High Energy ◽  
Time Duration ◽  
Laser Ceramic ◽  
Metal Aluminum ◽  
Aluminum Plasma ◽  
Energy Laser ◽  
Gas Breakdown ◽  
Short Time

Abstract In an effort to better understand and thereby utilize laser processing, an existing code describing laser-metal (aluminum) interaction is modified to describe laser-ceramic (diamond) interaction. Comparisons between our modified code (diamond target) and the original code (aluminum target) highlight similarities and differences between laser-ceramic and laser-metal processing. Gas breakdown effects, which are expected for the simulated short (time duration), high energy laser pulses, are observed in both codes. Due to the lower sublimation heat of aluminum (1.1×104J/g) compared to diamond (5.3×104J/g), aluminum vaporizes more quickly and exhibits a faster expansion speed (1.4×107 cm/sec compared to 8×106 cm/sec for diamond) in the early stage of the laser pulse. Because aluminum requires significantly more energy to fully ionize than does carbon, our simulations show that the diamond plasma is fully ionized (6 of 6 electrons per atom) and the aluminum plasma is partially ionized (11 of 13 electrons per atom).

CO2 laser induced gas breakdown in preionized argon

1980 ◽  
Vol 58 (2) ◽  
pp. 153-163
Author(s):  
J. Santiago ◽  
A. M. Robinson
Keyword(s):  
Co2 Laser ◽  
Electric Discharge ◽  
Laser Pulses ◽  
Cascade Model ◽  
Focal Region ◽  
Model Yield ◽  
Laser Induced Breakdown ◽  
Uv Photons ◽  
Gas Breakdown ◽  
Good Agreement

CO2 laser induced breakdown of argon is investigated as a function of pressure and preionization. The gas is preionized by uv photons from an electric discharge. By varying the time between the discharge and laser pulses, initial densities in the focal region vary from 109 cm−3 to 1012 cm−3. Numerical calculations of the breakdown process based on a cascade model yield thresholds which are in good agreement with measurements.

PRELIMINARY EVIDENCE FOR SELF‐FOCUSING IN GAS BREAKDOWN PRODUCED BY PICOSECOND LASER PULSES

1969 ◽  
Vol 14 (5) ◽  
pp. 145-146 ◽  
Author(s):  
A. J. Alcock ◽  
C. DeMichelis ◽  
V. V. Korobkin ◽  
M. C. Richardson
Keyword(s):  
Picosecond Laser ◽  
Laser Pulses ◽  
Preliminary Evidence ◽  
Self Focusing ◽  
Picosecond Laser Pulses ◽  
Gas Breakdown

Molecular gas breakdown by short laser pulses

1981 ◽  
Vol 14 (12) ◽  
pp. 2209-2214 ◽  
Author(s):  
Y EE-D Gamal ◽  
M A Harith
Keyword(s):  
Laser Pulses ◽  
Molecular Gas ◽  
Short Laser Pulses ◽  
Gas Breakdown

Self focusing in gas breakdown by laser pulses

1970 ◽  
Vol 3 (8) ◽  
pp. L88-L92 ◽  
Author(s):  
M H Key ◽  
D A Preston ◽  
T P Donaldson
Keyword(s):  
Laser Pulses ◽  
Self Focusing ◽  
Gas Breakdown

Causal heat transport induced by zeptosecond laser pulses

2002 ◽  
Vol 12 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Janina Marciak-Kozłowska ◽  
Mirosław Kozłowski
Keyword(s):  
Heat Transport ◽  
Laser Pulses
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