Chinese Optics Letters, 2019, 17 (7): 071401, Published Online: Jul. 9, 2019   

272  W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber

Author Affiliations
1 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
A large-mode-area (LMA) ytterbium-doped photonic crystal fiber (PCF) with core NA of 0.034 and core diameter of 50 μm was made by the stack-and-draw technique. The core is formed by Yb3+/Al3+/F /P5+ co-doped silica glass containing 0.09 mol% Yb2O3 with an absorption coefficient at 976 nm up to 3.2 dB/m. The core glass with homogeneous distribution of Yb3+ ions and refractive index difference of 4 × 10 4 compared with pure silica was prepared by the sol-gel method and heat homogenization at 2000°C. Laser power amplification of this LMA PCF was studied using a seed source of 21 ps pulse duration and 48.7 MHz repetition rate at 1030 nm wavelength. With pump power of 520 W, a maximum 272 W (266 kW peak power) quasi-single-mode laser output with M2 of 2.2 was achieved in a 4.7 m fiber length bent at a diameter of 47 cm with slope efficiency of 52%, and no obvious mode instability, stimulated Raman scattering, or thermal damage on the end facet of the fiber were observed.

Meng Wang, Fan Wang, Suya Feng, Chunlei Yu, Shikai Wang, Qinling Zhou, Lei Zhang, Fengguang Lou, Danping Chen, Lili Hu. 272  W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber[J]. Chinese Optics Letters, 2019, 17(7): 071401.

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