Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.28: Poster

Tuesday, March 8, 2005, 16:30–19:00, Poster TU F

Active and passive doped microstructured and photonic crystal fibres: — •Jens Kobelke, Johannes Kirchhof, Kirsten Gerth, Kay Schuster, Klaus Mörl, Claudia Aichele, and Hartmut Bartelt — Institut für Physikalische Hochtechnologie e.V., Albert-Einstein-Strasse 9, D-07745 Jena, Germany

The rapid development of novel designs of microstructured optical fibres (MOFs) and photonic crystal fibres (PCFs) as well as various material concepts open up improved technical implementations for fibre functionality: e.g. for fibre lasers, amplifiers, frequency filters, switching modules. We prepared and investigated high silica based MOFs with holey structure and with germanium and phosphorus doping. The aim of this design is to enlarge the possibility of tailoring the fibre properties, e.g. pulse dispersion and mode field shape. Novel types of laser fibres have been prepared by doping the core of PCFs with rare-earth elements. Such fibres are typically composed of a double-clad structures for efficient pumping. In current fibres the numerical aperture and the thermal stability are limited by the coating material. Its thermal behaviour typically reduces the power stability in longitudinal pumped ytterbium doped high power fibre lasers. We prepared different types of ytterbium doped PCFs with an air cladding in order to overcome this power limitation. The air cladding results in optical decoupling from the fibre coating and allows higher pump power levels compared with conventional polymer coated laser fibres due to an increase of the numerical aperture by a factor of about 2. The results of first laser tests show the high potential for power upgrading of this novel laser fibre concept.