Jena 2013 – scientific programme
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K: Fachverband Kurzzeitphysik
K 8: Laseranwendungen und Lasermaterialbearbeitung II
K 8.2: Talk
Thursday, February 28, 2013, 14:15–14:30, HS 4
Formation of femtosecond laser-induced nanogratings — •Felix Zimmermann1, Sören Richter1, Christian Vetter1, Andreas Tünnermann1,2, and Stefan Nolte1,2 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Straße 7, 07745 Jena, Germany
We investigated the formation of femtosecond pulse-induced subwavelength structures, also known as nanogratings, in the volume of transparent materials. These self-organized patterns appear after several ultrashort laser pulses undergoing three evolutional stages from randomly distributed nanopores to a homogeneous formed grating. We analyzed the scaling behavior as well as structural properties of the nanogratings by varying typical laser pulse parameters. In order to use the inherent form-birefringence of nanogratings for optical devices, we measured the retardance as well as the polarization contrast intensity after several annealing steps. We found outstanding temperature resistibility against temperatures up to 850° C, allowing the application in even harsh conditions. Moreover, the feedback process providing the cumulative action of subsequent laser pulses can be attributed to dangling bond type defects.