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Paper Abstract

Focussing ultrashort laser pulses allows for inscribing fiber Bragg gratings (FBGs) directly into rare earth doped fiber cores - without prior photosensitivity treatment. High reflective FBGs can be written into active Large Mode Area (LMA) Fibers with 20 micron core diameter using a phase mask scanning technique. Here, we demonstrate fiber Bragg gratings (FBGs), which cover only a fraction of the core. With this additional degree of freedom it is possible to taylor the reflectivity of individual modes. We show for example how those FBGs can be used in few mode LMA fibers to suppress reflections into higher order modes.

Paper Details

Date Published: 25 February 2010
PDF: 9 pages
Proc. SPIE 7589, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications X, 75890J (25 February 2010); doi: 10.1117/12.843805
Show Author Affiliations
Jens U. Thomas, Friedrich-Schiller-Univ. Jena (Germany)
Christian Voigtländer, Friedrich-Schiller-Univ. Jena (Germany)
Stefan Nolte, Friedrich-Schiller-Univ. Jena (Germany)
Andreas Tünnermann, Friedrich-Schiller-Univ. Jena (Germany)
Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Nemanja Jovanovic, Macquarie Univ. (Australia)
Graham D. Marshall, Macquarie Univ. (Australia)
Michael J. Withford, Macquarie Univ. (Australia)
Michael Steel, Macquarie Univ. (Australia)

Published in SPIE Proceedings Vol. 7589:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications X
Alexander Heisterkamp; Joseph Neev; Stefan Nolte; Rick P. Trebino, Editor(s)

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