Anti-reflection and polarizing photonic structures for high-power fiber applications

0485723 - ÚFE 2018 RIV US eng C - Conference Paper (international conference)
Vaněk, Martin - Vaniš, Jan - Baravets, Yauhen - Todorov, Filip - Čtyroký, Jiří - Honzátko, Pavel
Anti-reflection and polarizing photonic structures for high-power fiber applications.
Proceedings of SPIE, Micro-structured and Specialty Optical Fibres V, (vol.10232). Bellingham: SPIE, 2017 - (Kali, K.; Kaňka, J.; Mendez, A.), č. článku 102320W. ISBN 978-1-5106-0965-5.
[Conference on Micro-Structured and Specialty Optical Fibres V. Prague (CZ), 26.04.2017-27.04.2017]
R&D Projects: GA ČR GA15-07908S
Institutional support: RVO:67985882
Keywords : fiber laser * diffraction grating * optical fiber
OECD category: Optics (including laser optics and quantum optics)

We investigated behaviours of 1D binary diffraction gratings fabricated on optical fiber facets. Only sub wavelength structures were considered to suppress higher diffraction orders. The aperiodic rigorous coupled wave analysis, the Fourier modal method and the finite-difference time-domain numerical methods were used to compute and optimize the modal reflectance of the investigated structures. Optimized gratings were milled on fiber facets by focused ion beam. One of the gratings was tested in a thulium-doped fiber laser where it acted as a low reflectivity polarizing output mirror. A slope efficiency of the laser and a beam quality parameter were conserved while lasing threshold slightly increased
Permanent Link: http://hdl.handle.net/11104/0280673