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Title: Step-index high-absorption Yb-doped large-mode-area fiber with Ge-doped raised cladding
Authors: Sidharthan, Raghuraman
Ji, Junhua
Lim, Kang Jie
Lim, Serene Huiting
Li, Huizi
Lua, Jian Wei
Zhou, Yanyan
Tse, Chun Ho
Ho, Daryl
Seng, Yue Men
Chua, Song Liang
Yoo, Seongwoo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Sidharthan, R., Ji, J., Lim, K. J., Lim, S. H., Li, H., Lua, J. W., . . ., Yoo, S. (2018). Step-index high-absorption Yb-doped large-mode-area fiber with Ge-doped raised cladding. Optics Letters, 43(23), 5897-5900. doi:10.1364/OL.43.005897
Journal: Optics letters
Abstract: We report an all-solid large-mode-area (LMA) step-index fiber offering high absorption and low core numerical aperture (NA) by introducing a highly ytterbium-doped P:Al core and germanium-doped cladding. The fiber provides core absorption of ∼1200  dB/m at 976 nm with a low 0.07 core NA, due to the raised Ge cladding. Furthermore, matched profiles of P and Al across the core are successfully obtained with high concentration of Yb2O3 around 0.4 mol%. The fiber characteristics are routinely achievable by conventional modified chemical vapor deposition with a solution doping technique. A highly efficient laser with >100  W output power, 86% slope efficiency with respect to launched pump power, and a mean M2 of 1.34 has been demonstrated using the fabricated LMA step-index fiber. We also report 80% laser slope efficiency with 58 W output power (pump power limited) within only 0.5 m of the fiber when pumped by a wavelength-stabilized laser diode.
ISSN: 0146-9592
DOI: 10.1364/OL.43.005897
Rights: © 2018 Optical Society of America. All rights reserved. This paper was published in Optics Letters and is made available with permission of Optical Society of America.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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