Berlin 2014 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 1: Optische Methoden und Verfahren
K 1.3: Vortrag
Montag, 17. März 2014, 14:45–15:00, SPA SR203
Shaping nondiffracting few-cycle pulses with MEMS — •Alexander Treffer1, Jens Brunne2, Martin Bock1, Christian Patzek1, Ulrike Wallrabe2, and Ruediger Grunwald1 — 1Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max-Born-Strasse 2a, 12489 Berlin — 2University of Freiburg, Department of Microsystem Engineering, Laboratory for Microactuators, Georges-Köhler-Allee 102, 79110 Freiburg
Novel types of reflective micro-electro-mechanical systems (MEMS) for shaping pseudo-nondiffracting beams from ultrashort-pulsed lasers are presented. The phase profiles of these components are controlled by varying either voltage or temperature. In particular, two compact MEMS structures circular axicons [1], linear axicons [2], and spiral phase plates [3] with piezoelectric or thermally induced expansion were designed. Their purely reflective mode of operation enables for working even at high power densities and extremely short pulse durations down to the few-cycle range. The switching performance of the elements, the beam propagation characteristics and specific applications were studied. Recent results of multichannel nanostructuring of surfaces, few-cycle vortex pulse generation with tunable topological charge [3] and non-collinear phase shift autocorrelation of sub-3-cycle pulses are presented. References: 1. J. Brunne and U. Wallrabe, Optics Letters 38, 1939-1941 (2013). 2. J. Brunne, M. Wapler, R. Grunwald, and U. Wallrabe, J. Micromech. Microeng. 23, 115002 (2013). 3. M. Bock, J. Brunne, A. Treffer, S. König, U. Wallrabe, and R. Grunwald, Opt. Lett. 38, 3642-3645 (2013).