Inscription of fiber Bragg gratings in non-photosensitive and rare earth doped fibers applying ultrafast lasers [Elektronische Ressource] / von Elodie Wikszak

Inscription of fiber Bragg gratings innon-photosensitive and rare-earth dopedfibers applying ultrafast lasersDissertationZur Erlangung des akademischen Gradesdoctor rerum naturalium (Dr. rer. nat.)Friedrich-Schiller-Universitat¨ Jenavorgelegt dem Rat der Physikalisch-Astronomischen Fakultat¨der Friedrich-Schiller-Universitat Jena¨von M.Sc. Elodie Wikszakgeboren den 12.06.80 in Roubaix (Frankreich)1. Gutachter: Prof. Dr. Andreas Tunnermann¨2. Gutachter: Prof. Dr. Hartmut Bartelt3. Gutachter: Prof. Michael Withford, Sydney (Australien)Tag der letzten Rigorosumsprufung:¨ 12.05.2009Tag der offentlichen Verteidigung: 28.05.2009¨Contents1 Introduction 12 Fiber gratings theory 32.1 Lightguidinginanopticalfiber......................... 32.1.1 Bounded modes ..... 42.1.2 Analytical expressions of the bounded modes.............. 42.2 Fibergratings..................... 82.2.1 Long-periodandshort-periodgratings ................. 82.2.2 Coupled-modetheory............. 102.3 UniformFBGs ....................... 182.3.1 Coupled-modeequations........... 182.3.2 Diffractionefficiencyandreflectivity .................. 192.3.3 Bandwidth .................. 212.3.4 Claddingmodecoupling.............. 23 Fiber Bragg gratings inscription 253.1 Laserinducedrefractiveindexchange...................... 253.1.1 UVradiation........... 263.1.2 Femtosecondpulses....................... 303.2 FBGinscriptionusingfemtosecondpulses ..... 323.2.1 “Pointbypoint”technique..................