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14 November 2017 Side-pumping combiner for high-power fiber laser based on tandem pumping
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Abstract
We investigate a (2+1)×1 side-pumping combiner numerically and experimentally for high-power fiber laser based on tandem pumping for the first time. The influence of taper ratio and launch mode on the 1018-nm pump coupling efficiency and the leakage power into the coating of the signal fiber (LPC) is analyzed numerically. A side-pumping combiner is developed successfully by tapered-fused splicing technique based on the numerical analysis, consisting of two pump fibers ( 220/242  μm, NA=0.22) and a signal fiber ( 40/400  μm, NA=0.06/0.46). The total 1018-nm pump efficiency of the combiner is 98.1%, and the signal light insertion loss is <3%. The results show that, compared with laser diodes pumping, the combiner appears to have a better LPC performance and power handling capability when using 1018-nm fiber as the pump light. Meanwhile, an all-fiber MOPA laser based on tandem pumping with 1080-nm output of 2533 W and the slope efficiency of 82.8% is achieved based on the home-made combiner.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2017/$25.00 © 2017 SPIE
Yanran Gu, Chengmin Lei, Jun Liu, Ruixian Li, Le Liu, Hu Xiao, and Zilun Chen "Side-pumping combiner for high-power fiber laser based on tandem pumping," Optical Engineering 56(11), 116109 (14 November 2017). https://doi.org/10.1117/1.OE.56.11.116109
Received: 6 July 2017; Accepted: 10 October 2017; Published: 14 November 2017
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