High coupling efficiency and low signal light loss (2+1)× 1 coupler

doi:10.1088/1674-1056/24/6/064208

Abstract The coupling efficiency of the pump coupler determines the pump light injection capacity of a laser system. Experimental analysis of the influences of different factors on the pump coupling efficiency is in accordance with this conclusion. We use two Nufern fibers (400 μm/440 μm with NA = 0.22) as pump arm, one Nufern fiber (20 μm/400 μm with NA = 0.06/0.46) as a main fiber to make a side-pumping (2+1)× 1 coupler. The experimental result shows that the total output power of this (2+1)× 1 coupler is about 1160 W, corresponding to a coupling efficiency as high as 98.6%. The loss of signal light is less than 1%.

Keywords: fiber lasers diode-pumped lasers couplers

Received: 10 September 2014
Revised: 24 November 2014
Accepted manuscript online:

PACS:	42.55.Wd	(Fiber lasers)
	42.55.Xi	(Diode-pumped lasers)
	42.81.Qb	(Fiber waveguides, couplers, and arrays)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61307057) and the Fund from the State Key Laboratory of Tribology, Tsinghua University (Grant No. SKLT12B08).

Corresponding Authors: Gong Ma-Li
E-mail: gongml@mail.tsinghua.edu.cn

About author: 42.55.Wd; 42.55.Xi; 42.81.Qb

Cite this article:

Chen Xiao (陈霄), Xiao Qi-Rong (肖起榕), Jin Guang-Yong (金光勇), Yan Ping (闫平), Gong Ma-Li (巩马理) High coupling efficiency and low signal light loss (2+1)× 1 coupler 2015 Chin. Phys. B 24 064208

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High coupling efficiency and low signal light loss (2+1)× 1 coupler

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