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Proceedings Paper

Predicting laser coating removal rates
Author(s): Katherine X. Liu; Elsa M. Garmire; Claude R. Phipps
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Paper Abstract

Our measurements of laser coating removal rate for 14- micrometer-thick black organic paint coatings on a refractory substrate showed the rather astonishing result that total exposure time (Delta) t required to ablate the coating (for these particular thin organic coatings, in air) is described by (Delta) t equals C X I-3/2 sec where x is the coating thickness, I the incident pulse intensity (W/cm2) and the constant C equals 1.4 X 107 W3/2-s/cm4. This was true for wavelength 350 nm less than (lambda) less than 10.6 micrometer and incident intensity 81 W/cm2 less than I less than 424 MW/cm2, covering a 7-order-of- magnitude. Such a simple result is phenomenal because of the range of different physical processes known to be involved (simple boiling, thermal conduction and differential thermal expansion for the long pulses, but the combined effects of shock spallation, large excursions within the solid equation of state, and acceleration, compression, shocking, thermal conduction, radiation, phase explosion and even some ionization for the shortest pulses). If extensible to other coatings and substrates, it is also very valuable for the design of expensive laser coating removal facilities, which are now receiving strong interest for very large-scale decontamination and aircraft repainting. Our first-order parametric model fits the experimental results to within better than a factor-of-3 in laser intensity throughout the above range.

Paper Details

Date Published: 14 September 1998
PDF: 9 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321607
Show Author Affiliations
Katherine X. Liu, Lumonics Corp. (United States)
Elsa M. Garmire, Dartmouth College (United States)
Claude R. Phipps, Photonic Associates Inc. (United States)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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