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Fundamental investigations of ultrashort pulsed laser ablation on stainless steel and cemented tungsten carbide

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Abstract

An ultrashort pulse laser, capable of varying the pulse duration from 0.2 ps up to 10 ps, is used to study the ablation characteristics of stainless steel and cemented tungsten carbide. In addition to the influence of pulse duration, the number of pulses and the wavelength are examined for their influence on the ablation process. By determining the ablation diameter of generated cavities, the ablation threshold of the materials is calculated as a function of the number of pulses, the pulse duration, and the wavelength. The experimentally determined ablation thresholds tend to agree with calculated values. Due to the incubation effect, the ablation threshold decreases with increasing the number of pulses. In this context, the incubation factor (0.81@1030 nm and 0.80@515 nm for stainless steel, 0.90@1030 nm and 0.77@515 nm for cemented tungsten carbide) for the investigated materials is determined. On the basis of the measured ablated volume, the effective penetration depth (a reduction in a range from about 12 nm and 15 nm to 6 nm for stainless steel and in a range from 22 nm and 32 nm to 11 nm and 13 nm for cemented tungsten carbide by increasing the pulse duration from 0.2 ps to 10 ps) of the energy is calculated and it is proven that in the femtosecond regime the penetration depth increases compared with the picosecond regime. In consequence, the efficiency of the ablation process is increased by using shorter laser pulses.

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Acknowledgments

The authors thank the European Social Fund for Germany (ESF) for funding the project No. 100360636 and the project No. 100339506.

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  1. Hochschule Mittweida, Technikumplatz 17, 09648, Mittweida, Germany

    Peter Lickschat, Daniel Metzner & Steffen Weißmantel

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  1. Peter Lickschat
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Correspondence to Peter Lickschat.

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Lickschat, P., Metzner, D. & Weißmantel, S. Fundamental investigations of ultrashort pulsed laser ablation on stainless steel and cemented tungsten carbide. Int J Adv Manuf Technol 109, 1167–1175 (2020). https://doi.org/10.1007/s00170-020-05502-8

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  • DOI: https://doi.org/10.1007/s00170-020-05502-8

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