中国物理B ›› 2015, Vol. 24 ›› Issue (2): 24208-024208.doi: 10.1088/1674-1056/24/2/024208

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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

张海涛a, 陈丹b, 郝杰a, 闫平a, 巩马理a   

  1. a Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China;
    b Southwest Institute of Technical Physics, Chengdu 610041, China
  • 收稿日期:2014-07-04 修回日期:2014-08-16 出版日期:2015-02-05 发布日期:2015-02-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61475081).

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

Zhang Hai-Tao (张海涛)a, Chen Dan (陈丹)b, Hao Jie (郝杰)a, Yan Ping (闫平)a, Gong Ma-Li (巩马理)a   

  1. a Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China;
    b Southwest Institute of Technical Physics, Chengdu 610041, China
  • Received:2014-07-04 Revised:2014-08-16 Online:2015-02-05 Published:2015-02-05
  • Contact: Zhang Hai-Tao, Gong Ma-Li E-mail:zhanghaitao@mail.tsinghua.edu.cn;gongml@mail.tsinghua.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61475081).

摘要: 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.

关键词: fiber amplifier, large pitch fiber, mode coupling

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.

Key words: fiber amplifier, large pitch fiber, mode coupling

中图分类号:  (Lasers)

  • 42.55.-f
42.55.Wd (Fiber lasers)