Early Stage Material Motion and Transient Optical Properties of Metals after Ultrashort Laser Pulse Irradiation
Mcdonnell C, Winter J, Rapp S, Huber HP, Schmidt M (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 14
Pages Range: 8-12
Journal Issue: 1
DOI: 10.2961/jlmn.2019.01.0002
Abstract
Ultrashort pulsed lasers have gained widespread use in laser material processing applications, as they enable precise ablation due to their highly efficient energy deposition and low thermal damage. Recent investigations using double laser pulses for metal ablation with temporal spacing in the region of a few picoseconds (ps) have shown that the laser ablation efficiency decreases for the subsequent pulse in the laser pulse train, when the pulse separation is greater than approximately 5-10 ps. In order to understand this process the interaction between the ultrashort laser pulse and the metal must be understood. The early stage material motion and transient material properties can be analyzed using pump-probe ellipsometry, which allows the calculation of the transient complex refractive index in ultrashort timescales. By examining the transient change in the complex refractive index the ablation dynamics of four metals [Stainless Steel (AISI304), Aluminum (Al), Molybdenum (Mo) and Copper (Cu)] are investigated. All four metals show a strong decrease in the extinction coefficient k within a few picoseconds after irradiation, which is due a density decrease in the metal, generated from the high pressure induced by the femtosecond pulse. The results are discussed in terms of the impact for double pulse laser ablation of metals.
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Germany (DE)How to cite
APA:
Mcdonnell, C., Winter, J., Rapp, S., Huber, H.P., & Schmidt, M. (2019). Early Stage Material Motion and Transient Optical Properties of Metals after Ultrashort Laser Pulse Irradiation. Journal of Laser Micro Nanoengineering, 14(1), 8-12. https://doi.org/10.2961/jlmn.2019.01.0002
MLA:
Mcdonnell, Cormac, et al. "Early Stage Material Motion and Transient Optical Properties of Metals after Ultrashort Laser Pulse Irradiation." Journal of Laser Micro Nanoengineering 14.1 (2019): 8-12.
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