Multimode Ytterbium–Aluminosilicate Core Optical Fibre for Amplification and Laser Applications
Dunia Blaser,
Pascal Hänzi,
Sönke Pilz,
Alexander Heidt,
Valerio Romano
Affiliations
Dunia Blaser
Institute for Applied Laser, Photonics and Surface Technologies (ALPS), Bern University of Applied Sciences, ALPS, Pestalozzistrasse 20, CH-3400 Burgdorf, Switzerland
Pascal Hänzi
Institute of Applied Physics (IAP), University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Sönke Pilz
Institute for Applied Laser, Photonics and Surface Technologies (ALPS), Bern University of Applied Sciences, ALPS, Pestalozzistrasse 20, CH-3400 Burgdorf, Switzerland
Alexander Heidt
Institute of Applied Physics (IAP), University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Valerio Romano
Institute for Applied Laser, Photonics and Surface Technologies (ALPS), Bern University of Applied Sciences, ALPS, Pestalozzistrasse 20, CH-3400 Burgdorf, Switzerland
Rare-earth-doped optical fibres are widely used in lasers and amplifiers. The incorporation of ytterbium and aluminium oxide in a high doping concentration has led to the fabrication of a multi-mode (MM) optical fibre. Within this research, the design, preparation and calculation for the production of a fibre with a targeted 45 μm core diameter are explored. By Energy Dispersive X-ray (EDX) analysis, the doping concentrations of the elements in the core have been measured as 60.4 at.% Al and 1 at.% Yb. Supporting micrographs are used for confirming the core/cladding ratio. Based on the atomic percentage concentration, the calculated refractive index of the multi-element core has an n = 1.61 and an NA = 0.678. Characterisation of the fibre, including absorption and emission cross-section analysis, was performed in order to prove the ability of the fibre to be used for amplification as well as lasing applications.
