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6 February 2009 Mechanical stress in rare-earth-doped laser fibers
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Mechanical stress can significantly influence the optical and mechanical properties of fibers. We present results of nondestructive measurements of thermal stress in rare-earth-doped optical fibers, which are related to the doping variations across the fiber cross section and the preparation conditions. The samples are preforms and fibers with a large ytterbium doped core that were prepared by an alternative glass forming process, which is capable to realize bigger ratios of core to cladding diameter than the MCVD-method. To the best of our knowledge, this is the first time measurements of stresses and birefringence were made on such active optical fibers and their preforms. The results are compared to previous results on ytterbium-doped samples fabricated by the MCVD-technology. From the resultant stress profile, we could calculate the stress induced index changes that are relevant for the light propagation in optical fibers, and discuss the reasons for the observed mechanical stress. In addition, we could evaluate the samples regarding their changes in thermal expansion coefficient induced by doping with one or more oxides in several concentrations and different ratios. We confirmed our earlier result that the active doping component ytterbium generates much higher stress than other common dopants like aluminum, phosphorus or boron.
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Florian Just, Hans Rainer Müller, Stephan Grimm, and Hartmut Bartelt "Mechanical stress in rare-earth-doped laser fibers", Proc. SPIE 7212, Optical Components and Materials VI, 72120M (6 February 2009);

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