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Improved coupling coefficient of laser radiation to aluminum by means of absorptive polymer coatings

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1 Author(s)
McLachlan, A. D. ; Materials Research Laboratories, Defence Science and Technology Organisation, Melbourne 3032, Australia

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The application of a polymer coating to aluminum is shown to provide a convenient energy‐absorbing coating which increases the absorptance of the surface in a theoretically predictable way that is independent of the applied coating thickness. The dynamic absorptance of the coated surface for continuous‐wave CO2 laser radiation was measured and found to agree with a theoretical model. Above temperatures of 400–500 °C, the polymer coating was completely removed, leaving a clean aluminum surface. It is shown that up to this temperature the absorptance of the surface was approximately 0.30 and also dependent on the incident laser intensity.

Published in:

Journal of Applied Physics  (Volume:59 ,  Issue: 6 )