Abstract
We report the fabrication, characterization, and application (broadband supercontinuum [SC] generation) of ultra-high numerical-aperture heavily (50 mol. %) -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 μm, under the action of ns-range pulses launched from a smartly -switched erbium-doped fiber laser with operation wavelength (1.56 μm) matching the zero-dispersion wavelength of the high -doped fiber.
© 2017 Optical Society of America
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P. Harshavardhan Reddy, A. V. Kir’yanov, Anirban Dhar, Shyamal Das, Debjit Dutta, Mrinmay Pal, Y. O. Barmenkov, J. A. Minguella-Gallardo, Shyamal Kumar Bhadra, and Mukul Chandra Paul, "Fabrication of ultra-high numerical aperture GeO2-doped fiber and its use for broadband supercontinuum generation: publisher’s note," Appl. Opt. 61, 10229-10229 (2022)https://opg.optica.org/ao/abstract.cfm?uri=ao-61-34-10229
16 November 2022: A correction was made to the author affiliations.
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