Investigation of passive and active silica-tin oxide nanostructured optical fibers fabricated by "inverse dip-coating" and "powder in tube" method based on the chemical sol-gel process and laser emission

G. Granger; C. Restoin; P. Roy; R. Jamier; S. Rougier; J.-R. Duclere; A. Lecomte; R. Dauliat; J.-M. Blondy

doi:10.1117/12.2180868

7 May 2015 Investigation of passive and active silica-tin oxide nanostructured optical fibers fabricated by "inverse dip-coating" and "powder in tube" method based on the chemical sol-gel process and laser emission

G. Granger, C. Restoin, P. Roy, R. Jamier, S. Rougier, J.-R. Duclere, A. Lecomte, R. Dauliat, J.-M. Blondy

Author Affiliations +

Proceedings Volume 9507, Micro-structured and Specialty Optical Fibres IV; 95070J (2015) https://doi.org/10.1117/12.2180868
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

This paper presents a study of original nanostructured optical fibers based on the SiO₂-SnO₂-(Yb³⁺) system. Two different processes have been developed and compared: the sol-gel chemical method associated to the “inverse dip-coating” (IDC) and the “powder in tube” (PIT). The microstructural and optical properties of the fibers are studied according to the concentration of SnO₂. X-Ray Diffraction as well as Transmission Electron Microscopy studies show that the SnO₂ crystallizes into the cassiterite phase as nanoparticles with a diameter ranging from 4 to 50 nm as a function of tin oxide concentration. A comparative study highlights a better conservation of SnO₂ into the fiber core with the PIT approach according to the refractive index profile and energy dispersive X-Ray spectrometry measurement. The attenuation evaluated by the classic cut-back method gives respectively values higher than 3 dB/m and 0.2 dB/m in the visible (VIS) and infrared (IR) ranges for the PIT fibers whereas background losses reach 0.5 dB/m in the VIS range for IDC fibers. The introduction of ytterbium ions into the core of PIT fibers, directly in the first chemical step, leads to a laser emission (between 1050 and 1100 nm) according to the fiber length under 850 nm wavelength pumping. Luminescence studies have demonstrated the influence of the tin oxide on the rare earth optical properties especially by the modification of the absorption (850 to 1000 nm) and emission (950 to 1100 nm) by discretization of the bands, as well as on the IR emission lifetime evaluated to 10 μs.

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G. Granger, C. Restoin, P. Roy, R. Jamier, S. Rougier, J.-R. Duclere, A. Lecomte, R. Dauliat, and J.-M. Blondy "Investigation of passive and active silica-tin oxide nanostructured optical fibers fabricated by "inverse dip-coating" and "powder in tube" method based on the chemical sol-gel process and laser emission", Proc. SPIE 9507, Micro-structured and Specialty Optical Fibres IV, 95070J (7 May 2015); https://doi.org/10.1117/12.2180868

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KEYWORDS

Optical fibers

Tin

Oxides

Nanoparticles

Absorption

Silica

Sol-gels

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