Theoretical analysis of the mode coupling induced by heat of large-pitch micro-structured fibers

doi:10.1088/1674-1056/24/2/024208

Abstract In this paper, a theoretical model to analyze the mode coupling induced by heat, when the fiber amplifier works at high power configuration, is proposed. The model mainly takes into consideration the mode field change due to the thermally induced refractive index change and the coupling between modes. A method to predict the largest average output power of fiber is also proposed according to the mode coupling theory. The largest average output power of a large pitch fiber with a core diameter of 190 μm and an available pulse energy of 100 mJ is predicted to be 540 W, which is the highest in large mode field fibers.

Keywords: fiber amplifier large pitch fiber mode coupling

Received: 04 July 2014
Revised: 16 August 2014
Accepted manuscript online:

PACS:	42.55.-f	(Lasers)
	42.55.Wd	(Fiber lasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61475081).

Corresponding Authors: Zhang Hai-Tao, Gong Ma-Li
E-mail: zhanghaitao@mail.tsinghua.edu.cn;gongml@mail.tsinghua.edu.cn

Cite this article:

Zhang Hai-Tao (张海涛), Chen Dan (陈丹), Hao Jie (郝杰), Yan Ping (闫平), Gong Ma-Li (巩马理) Theoretical analysis of the mode coupling induced by heat of large-pitch micro-structured fibers 2015 Chin. Phys. B 24 024208

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Theoretical analysis of the mode coupling induced by heat of large-pitch micro-structured fibers

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