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  • Received: May. 17, 2019

    Accepted: Aug. 22, 2019

    Posted: Nov. 27, 2019

    Published Online: Nov. 27, 2019

    The Author Email: Zefeng Wang (

    DOI: 10.3788/COL201917.120602

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    Xin Tian, Hao Li, Le Liu, Meng Wang, Xiaoming Xi, Zefeng Wang. Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO2 laser[J]. Chinese Optics Letters, 2019, 17(12): 120602

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Chinese Optics Letters, Vol. 17, Issue 12, 120602 (2019)

Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO2 laser

Xin Tian1,2,3, Hao Li1,2,3, Le Liu1,2,3, Meng Wang1,2,3, Xiaoming Xi1,2,3, and Zefeng Wang1,2,3,*

Author Affiliations

  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  • 2State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
  • 3Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China


We report here an ultra-broadband linearly polarized (LP) LP01 LP11 mode converter operating at 1 μm based on a long period fiber grating (LPFG) fabricated in a conventional two-mode fiber (TMF) by a line-focused CO2 laser. The measured 3 dB bandwidth is about 240 nm, which is the broadest bandwidth for such fiber mode converters. The maximum conversion efficiency between the LP01 and LP11 modes is >99% over the range of 1000 nm to 1085 nm, almost covering the whole emission band of Yb3+, which is useful for further power scaling of high-power fiber lasers operating at the 1 μm band.

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