Analysis of laser absorption on a rough metal surface

We have developed a simple model to estimate the cumulative absorption coefficient of an ultraviolet laser pulse impinging on a pure metal, including the effects of surface roughness whose scale is much larger than the laser wavelength λ. The multiple reflections from the rough surface may increase...

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Bibliographic Details
Published in:Applied physics letters 1997-02, Vol.70 (6), p.696-698
Main Authors: Ang, L. K., Lau, Y. Y., Gilgenbach, R. M., Spindler, H. L.
Format: Article
Language:English
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Summary:We have developed a simple model to estimate the cumulative absorption coefficient of an ultraviolet laser pulse impinging on a pure metal, including the effects of surface roughness whose scale is much larger than the laser wavelength λ. The multiple reflections from the rough surface may increase the absorption coefficient over a pristine, flat surface by an order of magnitude. Thus, as much as 16% (at room temperature) of the power of a 248 nm KrF excimer laser pulse may be absorbed by an aluminum target. A comparison with experimental data is given.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.118242