TY - JOUR KW - Model KW - Modeling KW - Target KW - USA KW - Profiles KW - Surface KW - Evaporation KW - Laser KW - Laser ablation KW - Vaporization KW - Time KW - Ca KW - E KW - Fluence KW - Laser fluence KW - Number KW - Science KW - Structure KW - Vapor KW - C KW - Flow KW - Density KW - Pulsed laser KW - Pulsed laser KW - Targets KW - Thermal KW - Polymers KW - Alumina KW - Aluminum KW - Metal KW - Pressure KW - Ambient KW - Ambient pressure KW - Contact KW - Edge KW - Equation KW - Fluid KW - Gas-dynamics KW - Knudsen layer KW - Knudsen layer KW - Laser evaporation KW - Layer KW - Mach number KW - Profile KW - Pulsed laser evaporation KW - Reflectivity KW - Shock KW - Shock wave KW - Shock wave KW - Thermal evaporation KW - Thermal-model KW - Threshold KW - Values KW - Wave AU - Sungho Jeong AU - Ralph Greif AU - Richard E Russo AB -

A one dimensional thermal model was used to investigate the pulsed laser evaporation of aluminum targets. The gasdynamic flow of the vapor was predicted by solving one dimensional compressible flow equations for an inviscid fluid. The variation of the threshold laser fluence for target evaporation with respect to target surface reflectivity was investigated. The threshold laser fluence predicted by a thermal evaporation model was larger than the values obtained experimentally. The effects of the ambient pressure and the laser fluence on the local Mach number of the vapor at the edge of the Knudsen layer were studied. The structure of the gasdynamic flow including the shock wave and the contact surface was shown in the density profiles. (C) 1998 Elsevier Science B.V

AD -

Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

AN - 92 BT - Applied Surface Science C2 - LBNL-41215 LA - eng LB - Laser N1 -

LBNL-41215 NOT IN FILE

N2 -

A one dimensional thermal model was used to investigate the pulsed laser evaporation of aluminum targets. The gasdynamic flow of the vapor was predicted by solving one dimensional compressible flow equations for an inviscid fluid. The variation of the threshold laser fluence for target evaporation with respect to target surface reflectivity was investigated. The threshold laser fluence predicted by a thermal evaporation model was larger than the values obtained experimentally. The effects of the ambient pressure and the laser fluence on the local Mach number of the vapor at the edge of the Knudsen layer were studied. The structure of the gasdynamic flow including the shock wave and the contact surface was shown in the density profiles. (C) 1998 Elsevier Science B.V

PY - 1998 SP - 177 EP - 183 T2 - Applied Surface Science TI - Numerical modeling of pulsed laser evaporation of aluminum targets VL - 129 ER -