Product Code: ICA12_P145
Comparative Study on Microstructuring of Steel Using Pico- and Femtosecond Laser Pulses
Peter Lickschat, Hochschule Mittweida, Univ. of Applied Sciences; Mittweida Germany
Joerg Schille, Hochschule Mittweida, Univ. of Applied Sciences; Mittweida Germany
M. Mueller, Hochschule Mittweida, Univ. of Applied Sciences; Mittweida Germany
Steffen Weimantel, Hochschule Mittweida, Univ. of Applied Sciences; Mittweida Germany
G. Reie, Hochschule Mittweida, Univ. of Applied Sciences; Mittweida Germany
Presented at ICALEO 2012
The paper presents a comparative study in laser micro structuring using different ultra short pulse laser technologies. On several steel sheets picosecond and femtosecond laser pulses were irradiated in order to investigate the influence of the pulse duration onto the ablation process. The machining results obtained using picosecond and femtosecond laser pulses in the low laser fluence regime show smooth surfaces with a roughness almost independent from the pulse duration. On other hand femtosecond laser processing in the high fluence regime caused irregular und rough surfaces, and defect singularities were detected. Moreover a texture analysis indicated inhomogeneities of the material texture as cause for deep holes formations. In picoseconds laser processing isolated material bulges were found on the bottom of the ablation structures. Outgoing from the machining results optimized laser processing parameters are derived. Further the possibilities and limits of the ultra short pulse technology in industrial applications are shown by means of machining examples with respect to the ablation rate and machining quality. Finally the process efficiencies of the laser technologies are discussed.
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