Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.26: Poster
Montag, 14. März 2011, 16:30–19:30, P1
Point-by-point Inscription of Bragg Gratings in Coated Standard Telecommunication Fibers Using Infrared Femtosecond Laser Pulses — Jörg Burgmeier1, Günter Flachenecker2, •Markus Thiel1, and Wolfgang Schade1,2 — 1Institut für Energieforschung und Physikalische Technologien der TU Clausthal, EnergieCampus, Am Stollen 19 , 38640 Goslar — 2Fraunhofer Heinrich Hertz Institute, Fibre Optical Sensor Systems, EnergieCampus, Am Stollen 19, 38640 Goslar
Writing of fibre Bragg gratings (FBG) in non-photosensitized single mode fibres by femtosecond laser pulses has attracted significant interest in the recent past. The core and the cladding of a standard telecommunication fibre consist of fused silica, which is transparent in the near infrared spectral region. The interaction between laser pulses and the material is taking place by multiphoton absorption. In the interaction area a change of the refractive index takes place. A grating is created by periodical modification of the refractive index in the fibre. Generally the coating of the fibre has to be removed for this fabrication technique. In our approach the use of a tightly focussing objective lens in combination with a transparent polymer coating allows the inscription of FBGs without removing the coating. Due to the presence of a protecting polymer, the robustness of the resulting device could be improved, which is of great importance for various applications. A prototype of a FBG sensor system for monitoring stress being effective on power cables will be presented, too.