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Next generation of tailored mode selective transmission gratings for fiber integrated devices

: Heck, M.; Schwartz, G.; Krämer, R.G.; Richter, D.; Goebel, T.A.; Matzdorf, C.; Siems, M.P.; Tünnermann, A.; Nolte, S.


Herman, P.R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX : 2-5 February 2019, San Francisco, California, United States
Bellingham, WA: SPIE, 2019 (Proceedings of SPIE 10908)
ISBN: 978-1-5106-2459-7
ISBN: 978-1-5106-2458-0
Paper 109080N, 7 pp.
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <19, 2019, San Francisco/Calif.>
Industrial Laser, Laser Source and Laser Applications Conference (LASE) <2019, San Francisco/Calif.>
Photonics West Conference <2019, San Francisco/Calif.>
Deutsche Forschungsgemeinschaft DFG
GRK 2101; Geführtes Licht, dicht gepackt: neue Konzepte, Komponenten und Anwendungen
Conference Paper
Fraunhofer IOF ()

We report on the selective modal control of tailored femtosecond-written long period fiber gratings (LPFG). It is shown that the excitation of higher order cladding modes is possible with strong selectivity and high precision. The coupling behavior of several gratings dependent on the modified core cross section is determined theoretically and confirmed by experiments. Additional mode field measurements proof our concept. The presented tool could pave the way for a completely new branch of fiber integrated devices such as highly efficient transmission gratings or mode converters.