Stuttgart 2012 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 5: Lasersysteme und -komponenten
K 5.2: Vortrag
Donnerstag, 15. März 2012, 10:45–11:00, V57.04
Characterization of fast-switching low-dispersion MEMS-based micro-axicons for applications in ultrashort-pulse nanostructuring — •Alexander Treffer1, Jens Brunne2, Susanta Kumar Das1, Martin Bock1, Hamza Messaoudi1, Ulrike Wallrabe2, and Ruediger Grunwald1 — 1Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max-Born-Strasse 2a, D-12489 Berlin, Germany — 2University of Freiburg - IMTEK, Department of Microsystems Engineering, Laboratory for Microactuators, Georges-Köhler-Allee 102 , D-79110 Freiburg, Germany
New types of fast-switching micro-electro-mechanical systems (MEMS) for shaping ultrashort laser pulses were developed and characterized. Conical phase structures (axicons) and prismatic mirror arrangements ("linear axicons") are used to generate Bessel-like localized waves of variable geometry. Their reflective design enables for working at high power densities and very short pulse durations in few-cycle range. In experiments with amplified Ti:sapphire laser pulses, the switching performance of the elements and the propagation characteristics of the generated quasi-nondiffracting beams were studied. The devices are capable to work at repetition frequencies of a few kHz. Proof-of-principle application experiments were started in the field of nanostructuring. First results of the laser-induced generation of sub-wavelength ripple structures in the surface of transparent materials with large electronic bandgap are reported. Further applications for ultrafast measuring techniques, nonlinear spectroscopy, and optical pumping are proposed.