Bremen 2017 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 3: Laseranwendungen und Laserstrahlwechselwirkung II

K 3.1: Hauptvortrag

Dienstag, 14. März 2017, 14:00–14:35, GW2 B2890

Laser-induced shock waves in micro tubes — •Ulrich Teubner — Institut für Laser und Optik, Hochschule Emden/Leer, Constantiaplatz 4, D-26723 Emden

Since the first laser generated shock wave experiments in the 1980s, a lot of investigations have been performed, mostly concentrating on solids and plasmas and in the majority with free or slightly confined propagation of the shocks. On the other hand, although shock wave generation in gases performed in macroscopic tubes and with standard methods basing on blasts is quite common, those methods become not further applicable when the tube diameter is strongly decreased (e.g. to the sub-mm or micron range). Hence this demands new concepts and developments for the miniaturization of shock tubes down to several tens of micrometers diameter. Using laser induced micro shock waves (LIMS) in the confined geometry of such miniturized tubes, a novel suitable physical method is set off and discussed in detail within the present talk. The present work concentrates on the physics of LIMS. This includes experiments and simulations of the shock wave generation process and the shock wave propagation on such small scales. In particular, emphasis is put on well defined and controllable conditions which also offer the opportunity for potential applications in future. LIMS are induced by an intense fs-laser pulse and successional propagate in the strongly confined geometry of a tube. Thus, for the first time, a contactless investigation of the evolution of its density and velocity profiles etc. is applied to such small tubes. This work is supported by the Deutsche Forschungsgemeinschaft.