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Step-index high-absorption Yb-doped large-mode-area fiber with Ge-doped raised cladding

Optics Letters, ISSN: 1539-4794, Vol: 43, Issue: 23, Page: 5897-5900
2018
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Article Description

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 YbO 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 M 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.

Bibliographic Details

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

Optica Publishing Group

Physics and Astronomy

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