15 March 2013 Transient temperature modeling and shock wave observation in confined laser ablation of thin molybdenum films
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Abstract
The transient behavior of the laser lift-off of thin molybdenum films, initiated by glass substrate side irradiation with a 660 fs laser pulse, is investigated in the picosecond range. For this purpose, a pump-probe microscopy setup is utilized to measure the transient relative reflectivity change in the center of the irradiated spot at the molybdenum/glass interface, which enables an interferometric observation of the shock wave propagation in the glass. In addition, a transient simulation of the electron and lattice temperature was performed. The results suggest that ultrafast heating initiates a shock wave in the molybdenum and the glass when the laser pulse has reached maximum intensity. At 10 ps, a confined phase explosion adds further momentum, and the Mo layer is caused to bulge.
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Matthias Domke, Jürgen Sotrop, Stephan Rapp, Max Börger, Dominik Felsl, Heinz P. Huber, "Transient temperature modeling and shock wave observation in confined laser ablation of thin molybdenum films", Proc. SPIE 8611, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIII, 86111B (15 March 2013); doi: 10.1117/12.2004518; https://doi.org/10.1117/12.2004518
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