Novel dielectric nanoparticles (DNP) doped nano-engineered glass based optical fiber for fiber laser

Paul, M., Kir'yanov, A., Das, S., Pal, M., Bhadra, S., Barmenkov, Yu, Martinez-Gamez, A., Lucio-Martínez, J.L., Yoo, S. and Sahu, J.K. (2014) Novel dielectric nanoparticles (DNP) doped nano-engineered glass based optical fiber for fiber laser. In, Thomas, Sabu, Kalarikkal, Nandakumar, Stephan, A.Manuel, Haghi, B. and Raneesh, A.K. (eds.) Advanced Nanomaterials: Synthesis, Properties, and Applications. Abingdon, GB. Apple Academic Press, pp. 104-115. (doi:10.1201/b16966).

Abstract

We have developed the technology for making of dielectric nano-particles (DNP) doped nano-engineered glass based optical fibers. Two kinds of DNP containing silica glass based Yb₂O₃ doped fibers are made successfully through solution doping (SD) technique. One: Yb₂O₃ doped yttria-rich alumino-silica nano-particles based optical fiber developed during drawing of D-shaped low RI resin coated large mode area (LMA) optical fiber from the modified preform which annealed at 1450-1550°C for 3 hours under heating and cooling rates of 20ºC/min and other: Yb₂O₃ doped zirconia-germanium-alumino (ZGA) rich yttria-silica nano-particles based optical fibers developed during drawing of normal RI coated single mode optical fiber from the modified preform which annealed at 1000-1100°C for 3 hr under heating and cooling rates of 20°C/min. Fabrication of Yb₂O3 doped yttria-rich alumino-silica nano-particles based D-shaped low RI coated large core optical fibers having core diameter around 20.0-30.0 micron was made. The size of DNP nano-particles was maintained within 5-10 nm under doping of 0.20 mole% of fluorine. The start fiber preforms are studied by means of EPMA, EDX, and electron diffraction analyses, revealing phase-separated nano-sized ytterbium-rich areas in their cores. There is a great need to engineer the composition as well as doping levels of different elements within the core glass during the preform making stages to generate phase-separated Yb₂O₃ doped DNP nano particles in the fiber. The matter concentrates on making of Yb₂O₃ doped DNP containing optical fibers along with material characterizations, study of spectroscopic properties, photo-darkening phenomena, and lasing characteristics. Such kind of nano-engineered glass based optical fibers shows good lasing efficiency with improved photodarkening (PD) phenomena compared to the standard silica glass based optical fibers.

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Contributors

Author: J.K. Sahu

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