Dr. Katherine Liu Profile

Dr. Katherine Liu

Director of Sales & Marketing at AdValue Photonics, Inc.

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Proceedings Article | 14 September 1998 Paper

Predicting laser coating removal rates

Katherine Liu, Elsa Garmire, Claude Phipps

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321607

KEYWORDS: Coating, Pulsed laser operation, Data modeling, Carbon dioxide lasers, Continuous wave operation, Solids, Nd:YAG lasers, Information operations, Thermal modeling, Aluminum

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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 W^3/2-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.

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