Paul, Mukul Chandra and Bysakh, Sandip and Das, S and Bhadra, Shyamal Kumar and Pal, Mrinmay and Yoo, S and Kalita, M P and Boyland, A J and Sahu, J K (2010) Yb(2)O(3)-doped YAG nano-crystallites in silica-based core glass matrix of optical fiber preform. Materials science and Engineering B-Advanced Functional Solid-StateMaterials, 175 (2). pp. 108-119. ISSN 0921-5107

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Abstract

Yb(2)O(3)-doped yttrium aluminium garnet (YAG) nano-crystals within the silicate glass-based optical fiber preforms were obtained through the conventional-modified chemical vapour deposition (MCVD) and solution doping technique. Nano-crystals were developed with soaking of the porous phospho-silica or pure silica core layer in a solution containing the ytterbium, yttrium and other co-dopants, including fluorine using 10-15% fluorosilicic acid, and through post-annealing of the preform at a temperature of around 1450 degrees C. The size, shape and nature of Yb(2)O(3)-doped phase-separated nano-crystallites were evaluated from HRTEM images along with the electron diffraction pattern based on the doping levels of phosphorous and fluorine. The size of nano-crystallites was maintained within 6-10 nm when doped with 0.25 mole% of fluorine. X-ray analyses EDX data reveals that the nano-particles are rich in Yb:YAG, and uniformly dispersed into the amorphous silica glass matrix. The novelty of this technique involves the direct synthesis of rare-earth doped phase-separated nano-crystallites within the core region of silica glass preforms. This class of fibers containing the nano-particles with or without Yb:YAG crystalline nature will keep the advantage of the mechanical properties as well as good lasing properties under high power application compared to the Yb:YAG ceramic laser. (C) 2010 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Fiber optics; Solution doping technique; Porous soot layer; Annealing; Nano-crystalline materials; High-resolution transmission electron microscopy
Subjects:	Processing Science
Divisions:	Fiber Optics and Photonics
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Feb 2012 06:46
Last Modified:	26 Nov 2012 06:01
URI:	http://cgcri.csircentral.net/id/eprint/900

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