The 2 μm and visible emission of low phonon (805 cm^-1) germanate glasses and double – clad optical fiber co-doped with 0.7Yb₂O₃/(0.07-0.7)Ho₂O₃ ions have been investigated. Luminescence at 2 μm corresponding to Ho³⁺: ⁵I₇ → ⁵I₈ as well as upconversion luminescence in the visible spectral range corresponding to the Ho³⁺: ⁵S₂(⁵F₄)→⁵I₈ (545 nm), and Ho³⁺: ⁵F₅→⁵I₈ (655 nm) transition, respectively were obtained. The optimization of the acceptor content and donor-acceptor ratio were conducted with the purpose of maximizing the luminescence intensity. The highest luminescence intensity in both spectral range was obtained in glass co-doped with 0.7Yb₂O₃/0.15 Ho₂O₃. Despite relatively small effective absorption coefficient of the optical fiber comparative analysis of luminescent properties of fabricated glasses (further core) and double – clad optical fiber showed significant contribution of reabsorption process of emitted ASE signal.

Date Published: 28 September 2016
PDF: 7 pages
Proc. SPIE 10031, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2016, 1003109 (28 September 2016); doi: 10.1117/12.2248898

Published in SPIE Proceedings Vol. 10031:
Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2016
Ryszard S. Romaniuk, Editor(s)