Main > HPArticle > Ultra-broadband highly efficient mode converter at 1 μm fabricated by line-focused CO2 laser
  • Abstract
  • Get PDF
  • Paper information
  • Manuscript Accepted: Aug. 22, 2019

    Online Published: Aug. 23, 2019

Chinese Optics Letters, 2019, Vol. 17, Issue 12, pp.

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

Xin Tian, Hao Li, Liu Le, Wang Meng, Xi Xiaoming, Wang Zefeng

Author Affiliations

  • 长沙 国防科技大学光电科学与工程学院定向能技术研究所
  • 长沙 国防科技大学光电科学与工程学院定向能技术研究所
  • 长沙 国防科技大学光电科学与工程学院定向能技术研究所

Abstract

We report here an ultra-broadband 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 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 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 operation at 1μm band.

keywords