Morphology studies of the metal surfaces with enhanced absorption fabricated using interferometric femtosecond ablation |
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Authors: | J J J Kaakkunen K Paivasaari M Kuittinen and T Jaaskelainen |
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Institution: | (1) Department of physics and mathematics, University of Joensuu, P.O. Box 111, 80101 Joensuu, Finland |
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Abstract: | Recently, the enhancing of bulk metals optical absorption with focused femtosecond pulses was demonstrated. This absorption
enhancement is caused by different nano- and micro-structures which are formed during laser ablation with ultrashort pulses.
In this paper we study the evolution of the surface structures using interferometric ablation and compare it to normal fs-ablation.
Previously we have shown that interferometric femtosecond ablation is an efficient method to fabricate absorbing metal surfaces.
In this study we ablated large areas of hole-array structures with different pulse numbers in polished stainless steel and
copper samples. The evolution of surface morphology and the depth of the holes for these structured surfaces are presented.
In addition, the reflectance of laser generated surface structures are measured at the wavelength range of 200–2300 nm using
a standard spectrophotometer. |
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Keywords: | PACS" target="_blank">PACS 52 38 Mf 78 20 Ci 78 40 Kc |
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