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A model of laser ablation with temperature-dependent material properties, vaporization, phase explosion and plasma shielding

DSpace at IIT Bombay

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Title A model of laser ablation with temperature-dependent material properties, vaporization, phase explosion and plasma shielding
 
Creator MARLA, D
BHANDARKAR, UV
JOSHI, SS
 
Subject EXPANDED LIQUID-METALS
THERMAL-MODEL
SURFACE-TENSION
CRITICAL-POINT
AMBIENT GAS
VAPOR
PLUME
TRANSITION
DEPOSITION
ALUMINUM
 
Description Laser ablation of metals using nanosecond pulses occurs mainly due to vaporization. However, at high fluences, when the target is heated close to its critical temperature, phase explosion also occurs due to homogeneous nucleation. Due to a wide variation in target temperature, the material properties also show a considerable variation. In this paper, a model of laser ablation is presented that considers vaporization and phase explosion as mechanisms of material removal and also accounts for the variation in material properties up to critical temperature using some general and empirical theories. In addition, plasma shielding due to inverse bremsstrahlung and photo-ionization is considered. The model predicts accurately (within 5 %) the phase explosion threshold fluence of Al. The predictions of ablation depth by the model are in reasonable agreement with experimental measurements at low fluences. Whereas, the degree of error marginally increases at high laser fluences.
 
Publisher SPRINGER
 
Date 2014-12-28T11:46:59Z
2014-12-28T11:46:59Z
2014
 
Type Article
 
Identifier APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 116(1)273-285
0947-8396
1432-0630
http://dx.doi.org/10.1007/s00339-013-8118-0
http://dspace.library.iitb.ac.in/jspui/handle/100/16396
 
Language English