Thulium-doped fiber lasers have recently attracted a growing interest because of the possibility to combine emission around 2 $\mu$m with the high beam quality and compactness provided by the fiber medium. A key factor for power scaling of these devices, especially if operation in the short-and ultrashort-pulse regime is desired, is the availability of active fibers capable of joining large effective area and robust single-mode guiding. The strong thermo-optic effect originating from the large quantum defect of Tm ions hinders the possibility to easily find a design with such features, strongly improving the confinement of high-order modes and shrinking the mode area of the fundamental one. In this paper, a rod-type double-cladding photonic crystal fiber with inner cladding properly designed without any mirror symmetry in the cross-section is presented, and its guiding properties are thoroughly analyzed by means of numerical simulations, taking into account the effects of thermally-induced refractive index change. The results have shown that, with a careful choice of the structural parameters, the proposed fiber is capable of ensuring effective high-order mode suppression and effective area up to 3800 2 when operating under heat load of about 300 W/m.

Symmetry-free Tm-doped photonic crystal fiber with enhanced mode area / Coscelli, Enrico; C., Molardi; Cucinotta, Annamaria; Selleri, Stefano. - In: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS. - ISSN 1077-260X. - 20:5(2014), pp. 544-550. [10.1109/JSTQE.2014.2299636]

Symmetry-free Tm-doped photonic crystal fiber with enhanced mode area

COSCELLI, Enrico;CUCINOTTA, Annamaria;SELLERI, Stefano
2014-01-01

Abstract

Thulium-doped fiber lasers have recently attracted a growing interest because of the possibility to combine emission around 2 $\mu$m with the high beam quality and compactness provided by the fiber medium. A key factor for power scaling of these devices, especially if operation in the short-and ultrashort-pulse regime is desired, is the availability of active fibers capable of joining large effective area and robust single-mode guiding. The strong thermo-optic effect originating from the large quantum defect of Tm ions hinders the possibility to easily find a design with such features, strongly improving the confinement of high-order modes and shrinking the mode area of the fundamental one. In this paper, a rod-type double-cladding photonic crystal fiber with inner cladding properly designed without any mirror symmetry in the cross-section is presented, and its guiding properties are thoroughly analyzed by means of numerical simulations, taking into account the effects of thermally-induced refractive index change. The results have shown that, with a careful choice of the structural parameters, the proposed fiber is capable of ensuring effective high-order mode suppression and effective area up to 3800 2 when operating under heat load of about 300 W/m.
Symmetry-free Tm-doped photonic crystal fiber with enhanced mode area / Coscelli, Enrico; C., Molardi; Cucinotta, Annamaria; Selleri, Stefano. - In: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS. - ISSN 1077-260X. - 20:5(2014), pp. 544-550. [10.1109/JSTQE.2014.2299636]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2709694
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