7 March 2014 Surface blackening by laser texturing with high repetition rate femtosecond laser up to 1MHz
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Abstract
The interaction between laser pulses and material surface can generate sub-wavelength surface structures named ripples. The used of ultrashort laser pulses avoid thermal effect in the lattice so the structures generated are well preserved and can be observed on various materials as metals, polymers or crystals. With increasing energy deposit, ripples grow to give cone-shape structures named spikes. All these structures are interesting to give special properties to the treated surface as coloration change, improvement of light absorption or modification of wettability properties. These structure generation process is well known for femtosecond Ti:Sa laser with a pulse duration below 100fs and repetition rates in the range of 10 kHz. However, to be relevant for industrial applications, the average power of the laser is a critical parameter. The emergence of new femtosecond Yb doped fiber lasers with pulse duration below 350fs permits an increase of the average power for a few years. We will present our latest results obtained for surface texturation on various metals such as stainless steel, titanium, aluminum and copper with these up to date laser source. We study the influence of the average power and of the repetition rate up to 1000 kHz on the surface structures generated on scanned areas. We obtain light reflexion below 7% on stainless steel and below 5% on titanium from 200nm to 2000nm. The characterizations of the results are done with SEM imaging, optical profilometry and with a spectrophotometer.
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M. Faucon, A. Laffitte, J. Lopez, R. Kling, "Surface blackening by laser texturing with high repetition rate femtosecond laser up to 1MHz", Proc. SPIE 8972, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV, 89721M (7 March 2014); doi: 10.1117/12.2039469; https://doi.org/10.1117/12.2039469
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