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12 March 2014 Thermo-optical effects in Tm-doped large mode area photonic crystal fibers
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Designs of Tm-doped photonic crystal fibers for laser operation must take in account the strong thermo-optical effects due to the Tm quantum defect and the consequent corruption of the single mode guiding properties. A new fiber design with a ∼ 80 μm core diameter, based on the cladding mirror symmetry reduction is proposed and analyzed using a full-vector FEM-based modal solver. The thermal effects are investigated using a computationally efficient model. A large pitch fiber with similar core diameter, which represents the actual state-of-art of Tm-doped laser technology, has been investigated in order to have a basis of comparison. Optimizing some key parameters of the new symmetry free fiber, the possibility to achieve a wide band single mode operation under an heavy heat load of over 300 W/m is demonstrated. In particular a very high modal discrimination value larger than 0.5 is obtained.
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Carlo Molardi, Enrico Coscelli, Annamaria Cucinotta, and Stefano Selleri "Thermo-optical effects in Tm-doped large mode area photonic crystal fibers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89612Q (12 March 2014);

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