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Q: Fachverband Quantenoptik und Photonik

Q 10: Ultrakurze Laserpulse: Anwendungen

Q 10.8: Vortrag

Montag, 12. März 2012, 15:45–16:00, V38.01

Direct Writing of 3-D Waveguides with Bragg Structure in Bulk Glass — •Markus Thiel, Günter Flachenecker, Jörg Burgmeier, and Wolfgang Schade — Fraunhofer Heinrich Hertz Institute, Fibre Optical Sensor Systems, EnergieCampus, Am Stollen 19A, 38640 Goslar

Optical fiber Bragg gratings are mainly used for sensing mechanical stress or temperature. Waveguide Bragg structures in integrated optics are used as resonators or optical frequency filters. While Bragg gratings can be produced with femtosecond Laser pulses without much efforts in fibers it is much more challenging to apply this technique for generating such structures in transparent bulk materials. For this reason most Bragg structures in photonic chips are realized by lithographic techniques and only a view publications report about waveguide Bragg gratings processed by femtosecond lasers [1, 2]. In this talk we present a new direct writing procedure for realizing waveguide Bragg structures in bulk glasses. Firstly we present a new technique for controlling the waveguide diameter by processing 3-D waveguide bundles. Furthermore we show how to optimize the coupling coefficient for Bragg reflections of light by controlling the writing parameters and precise positioning of the Bragg grating structures within the waveguide bundle.
References:
1. G.D. Marshal, M. Ams, M.J. Withford, Opt Lett, 31, 2690 (2006)
2. H Zhang, S.H. Eaton, P.R. Herman, Opt Lett, 32, 2561 (2007)