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Title: Energy conversion and momentum coupling of the sub-kJ laser ablation of aluminum in air atmosphere

Energy conversion and momentum coupling using nano-second 1-μm-wavelength pulse laser irradiation on an aluminum target were measured in air and nitrogen gas atmospheres over a wide range of laser pulse energies from sub-J to sub-kJ. From the expansion rate of the shock wave, the blast-wave energy conversion efficiency, η{sub bw}, was deduced as 0.59 ± 0.02 in the air atmosphere at an ambient pressure from 30 to 101 kPa for a constant laser fluence at 115 J/cm{sup 2}. Moreover, the momentum coupling of a circular disk target was formulated uniquely as a function of the dimensionless shock-wave radius and the ratio of the laser spot radius to the disk radius, while η{sub bw} could be approximated as constant for the laser fluence from 4.7 to 4.1 kJ/cm{sup 2}, and the ambient pressure from 0.1 to 101 kPa.
Authors:
;  [1] ;  [2]
  1. Department of Aerospace Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603 (Japan)
  2. Department of Engineering Mechanics and Energy, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)
Publication Date:
OSTI Identifier:
22494759
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABLATION; ALUMINIUM; CONTROLLED ATMOSPHERES; ENERGY CONVERSION; ENERGY EFFICIENCY; LASER RADIATION; NITROGEN; PRESSURE RANGE KILO PA; PULSED IRRADIATION; SHOCK WAVES; WAVELENGTHS