Shock wave analysis of laser assisted particle removal
作者:
S. J. Lee,
K. Imen,
S. D. Allen,
期刊:
Journal of Applied Physics
(AIP Available online 1993)
卷期:
Volume 74,
issue 12
页码: 7044-7047
ISSN:0021-8979
年代: 1993
DOI:10.1063/1.355017
出版商: AIP
数据来源: AIP
摘要:
Laser assisted particle removal (LAPR) is an innovative laser cleaning technique which can remove various particles from solid surfaces via laser induced explosive evaporation of a chosen energy transfer medium, e.g., water. An Ar+ion continuous‐wave laser (488 nm) was used to study the CO2laser pumped explosive evaporation of water adsorbed on a Si substrate. The probe laser beam was parallel to the sample surface at different displacements and interacted with the ejected material upon pulsed CO2laser irradiation in analogy with the time resolved laser beam deflection experiments on laser induced vaporization of copper by Guoetal. [Opt. Commun.77, 381 (1990)]. Using CO2laser energies which are much greater than the LAPR thresholds, we observed the generation and propagation of a shock wave at supersonic speeds followed by a water vapor/aerosol/particle cloud at a much slower speed. From the evolution of the shock wave, the total conversion efficiency of the incident laser beam into the shock wave has been determined using a self‐similar approximation.
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