作者
Jeffrey W Nicholson, Jose Pincha, Ishu Kansal, Robert S Windeler, Eric Monberg, Vasiliy Lukonin, Anand Hariharan, Gregory Williams, Andrea Rosales-Garcia, Lalitkumar Bansal, David J DiGiovanni
发表日期
2023/3/8
研讨会论文
Fiber Lasers XX: Technology and Systems
卷号
12400
页码范围
1240002
出版商
SPIE
简介
We report results from a new Yb-doped gain fiber with increased higher-order-mode (HOM) loss, compared to conventional step-index fibers. The fiber had 20 µm mode-field diameter (MFD), high absorption, and high transverse-mode instability (TMI) threshold. TMI-free operation with 5 kW output power was demonstrated from a 9 m length of gain fiber, limited by pump power. The large MFD and high absorption allowed for a 7.5 m long amplifier with greater than 80% o-o efficiency and the Raman peak more than 50 dB below the signal. These results were also enabled by a new, small-size, 7+1:1 pump-signal combiner.
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JW Nicholson, J Pincha, I Kansal, RS Windeler… - Fiber Lasers XX: Technology and Systems, 2023