Reddy, P Harshavardhan and Kir'yanov, A V and Dhar, Anirban and Das, Shyamal and Dutta, Debjit and Pal, Mrinmay and Barmenkov, Y O and Minguella-Gallardo, J A and Bhadra, Shyamal Kumar and Paul, Mukul Chandra (2017) Fabrication of ultra-high numerical aperture GeO2-doped fiber and its use for broadband supercontinuum generation. Applied Optics, 56 (33). pp. 9315-9324. ISSN 0003-6935

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We report the fabrication, characterization, and application (broadband supercontinuum SC] generation) of ultra-high numerical-aperture heavily (50 mol. %) GeO2-doped optical fiber, obtained through a modified chemical vapor deposition process and rod-in-tube method. The formation of Ge-related diamagnetic defect centers, such as germanium oxygen defect centers (GeODC) with nonbridging lone electron pairs, confirmed by x-ray photoelectron spectroscopy and optical absorption studies, inducing hypolarizable local dipoles, may be responsible in boosting the nonlinear effects and enhancing stimulated Raman scattering at pumping with high-power pulses, culminating in generation of broadband SC generation. The SC spans toward the Stokes side up to 2.4 mu m, under the action of ns-range pulses launched from a smartly Q-switched erbiumdoped fiber laser with operation wavelength (1.56 mu m) matching the zero-dispersion wavelength of the high GeO2-doped fiber. (C) 2017 Optical Society of America

Item Type: Article
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Feb 2018 09:07
Last Modified: 01 Feb 2018 09:07

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