Proceedings Article | 13 March 2019
KEYWORDS: Laser ablation, Liquids, Nanoparticles, Cavitation, Laser applications, Pulsed laser operation, Laser systems engineering, Laser scanners, Laser energy, Laser manufacturing
Pulsed laser ablation in liquids is an innovative method, which enables the production of an almost unlimited array of highly pure colloidal nanoparticles that can be utilized in a wide range of applications [1]. However, until recently the drawback of this method was its limited productivity that was an order of magnitude lower compared to other colloidal synthesis methods. To study the problem of low productivity, different entities and dynamics occurring during the laser synthesis need to be considered.
In this contribution, we show how high-throughput generation of nanoparticles is achieved by ultra-short pulsed lasers. We utilize a high-repetition-rate laser system consisting of a 500W ps-laser source and a laser scanner that reaches a scanning speed of up to 500m/s. This unique system enables spatial bypassing the cavitation bubble and thereby applying most of the laser energy to the target. The cavitation bubbles are laterally separated by varying the scanning speed to obtain the best scanning parameters [2].
Further strategies for upscaling as well as fundamental considerations of the cavitation bubble dynamics are discussed [3]. The talk will conclude with applications of laser-generated nanoparticles in laser additive manufacturing [4].
[1] D. Zhang, B. Gökce and S. Barcikowski, Chem. Rev., 117, 3990, (2017).
[2] R. Streubel, S. Barcikowski and B. Gökce, Opt. Lett., 41, 1486, (2016).
[3] C.-Y. Shih, R. Streubel, J. Heberle, A. Letzel, M. V. Shugaev, C. Wu, M. Schmidt, B. Gökce, S. Barcikowski, L. V. Zhigilei, Nanoscale 10, 6900 (2018).
[4] C. Doñate-Buendía, F. Frömel, M. B. Wilms, R. Streubel, J. Tenkamp, T. Hupfeld, M. Nachev, E. Gökce, A. Weisheit, S. Barcikowski, F. Walther, J. H. Schleifenbaum, B. Gökce, Materials & Design 154, 360 (2018).
