Nanocrystalline ceramic phosphors for high-power lasers operating at 2μm

0519178 - ÚFE 2020 RIV PL eng C - Conference Paper (international conference)
Mrázek, Jan - Kašík, Ivan - Aubrecht, Jan - Podrazký, Ondřej - Cajzl, Jakub - Peterka, Pavel
Nanocrystalline ceramic phosphors for high-power lasers operating at 2μm.
21st International Conference on Transparent Optical Networks, ICTON 2019. Varšava: IEEE, 2019 - (Jaworski, M.; Marciniak, M.), č. článku Th.D6.1. ISBN 978-1-7281-2779-8. ISSN 2162-7339. E-ISSN 2161-2064.
[21st International Conference on Transparent Optical Networks, ICTON 2019. Angers (FR), 09.07.2019-13.07.2019]
R&D Projects: GA ČR(CZ) GA17-20049S
Institutional support: RVO:67985882
Keywords : Holmium * Luminescence * Fiber * Nanocrystals
OECD category: Optics (including laser optics and quantum optics)

Rare-earth (RE) doped silica glass optical fibers became a hearth of modern fiber-lasers. Such lasers are fully competitive with conventional solid-state lasers because of their high brightness, high quality beam, high conversion efficiency, good thermal management, tunability, compactness, size and even flexibility. However, a low solubility of RE inside a silica matrix and a high phonon energy of silica glass strongly reduce the luminescence efficiency of incorporated RE elements. Nanoparticle doping represents a powerful method that can eliminate these disadvantages.In this contribution we present an effect of the processing temperature on the luminescence properties of nanocrystalline (Eu0.05Y0.95)2Ti2O7 and (Ho0.05Y0.95)2Ti2O7 phosphors. The luminescence properties of (Ho0.05Y0.95)2Ti2O7 improved with increasing nanocrystal size. The nanocrystals of (Ho0.05Y0.95)2Ti2O7 were successfully incorporated into optical fiber with the outer diameter 125 μm and the core diameter 8 μm. The fiber's numerical aperture was 0.13 and the background losses at 850 nm were 0.38 dB•m-1.The lifetime of the 5I7 →5I8 transition at 1.92 μm was 0.72 ± 0.01 ms. The results bring the fundamental information about the effect of the nanocrystal size their luminescence properties of (RE0.05Y0.95)2Ti2O7 and their possible application as phosphors in active optical fibers
Permanent Link: http://hdl.handle.net/11104/0304206