Early Stage Material Motion and Transient Optical Properties of Metals after Ultrashort Laser Pulse Irradiation

Journal article


Publication Details

Author(s): Mcdonnell C, Winter J, Rapp S, Huber HP, Schmidt M
Journal: Journal of Laser Micro Nanoengineering
Publication year: 2019
Volume: 14
Journal issue: 1
Pages range: 8-12
ISSN: 1880-0688


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.


FAU Authors / FAU Editors

Schmidt, Michael Prof. Dr.-Ing.
Lehrstuhl für Photonische Technologien


External institutions with authors

Hochschule für angewandte Wissenschaften München


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://dx.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.

BibTeX: 

Last updated on 2019-21-07 at 08:08