Optical properties of heavily ytterbium- and fluorine-doped aluminosilicate core fibres
An improved MCVD process has been proposed which allows one to fabricate ytterbium-doped fibre preforms with a fluorine-doped aluminosilicate glass-based core. Using this process, we have demonstrated the possibility of codoping the glass with high Yb{sup 3+} concentration (about 2 wt %), high fluorine concentration (2 wt %) and aluminium oxide concentration above 1.5 mol % (to ensure high ytterbium solubility), resulting in a record low refractive index of the glass (Δn ≈ 0.000 – 0.003). A series of fibre with a SiO{sub 2} – Al{sub 2}O{sub 3} – GeO{sub 2} – Yb{sub 2}O{sub 3} – F core have been fabricated and their optical characteristics have been investigated. In particular, we have demonstrated the possibility of reaching the highest possible lasing efficiency (82.7 % with respect to absorbed pump power). We have studied the photodarkening level in the fibres as a function of ytterbium concentration and demonstrated the feasibility of making ytterbium-doped fibre amplifiers based on the described fibres, with an extremely low output power degradation rate (less than 20 % after 10 000 h of continuous operation). (paper)
- OSTI ID:
- 23000355
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 47, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
Similar Records
Luminescence and photoinduced absorption in ytterbium-doped optical fibres
Role of oxygen hole centres in the photodarkening of ytterbium-doped phosphosilicate fibre