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

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

doi:10.3788/COL201917.120602

Journals >Chinese Optics Letters >Volume 17 >Issue 12 >Page 120602 > Article

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 Tian^1、2、3, Hao Li^1、2、3, Le Liu^1、2、3, Meng Wang^1、2、3, Xiaoming Xi^1、2、3, and Zefeng Wang^{1、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

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DOI: 10.3788/COL201917.120602 Cite this Article Set citation alerts

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 Copy Citation Text

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Abstract

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.