Open AccessEnhanced optical absorptance of metals using interferometric femtosecond ablation
Author(s) -
Kimmo Päiväsaari,
Jarno Kaakkunen,
Markku Kuittinen,
Timo Jääskeläinen
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.013838
Subject(s) - absorptance , optics , materials science , femtosecond , interferometry , laser ablation , laser , absorption (acoustics) , ablation , surface roughness , integrating sphere , optoelectronics , reflectivity , physics , engineering , composite material , aerospace engineering
The enhanced optical absorptance in metals was recently demonstrated using femtosecond laser-induced surface structuring. This structuring was obtained by simply focusing the light to the sample surface. Here we demonstrate more efficient absorptance enhancement using interferometric ablation. This interferometric ablation technique produces deeper surface structures and, consequently, higher absorption than structures obtained by just focusing the light to the surface. We also show the measured reflectance spectra over visible region for unaltered and structured stainless steel and copper samples.