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Chin. Opt. Lett.
 Home  List of Issues    Issue 03 , Vol. 16 , 2018    10.3788/COL201816.031407


4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings
Baolai Yang1, Hanwei Zhang1;2;3, Qing Ye4, Haoyang Pi4, Chen Shi1;2;3, Rumao Tao1;2;3, Xiaolin Wang1;2;3, and Xiaojun Xu1;2;3
1 College of Advanced Interdisciplinary Studies, [National University of Defense Technology], Changsha 41 0073, China
2 [Hunan Provincial Key Laboratory of High Energy Laser Technology], Changsha 410073, China
3 [Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser], Changsha 410073 , China
4 [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences], Shanghai 201800, China

Chin. Opt. Lett., 2018, 16(03): pp.031407

DOI:10.3788/COL201816.031407
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.3510  140.3615  060.3735  

Abstract
With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering (SRS) effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings (FBGs) increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber (YDF) with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of ~1080 ?nm with a total 915 nm pump power of ~6.7 kW. At the operation of 4.05 kW, the intensity of the Raman Stokes light is ~25 dB below the signal laser, and the beam quality (M2-factor) is ~2.2. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2017/11/22
Accepted:2018/1/18
Posted online:2018/3/7

Get Citation: Baolai Yang, Hanwei Zhang, Qing Ye, Haoyang Pi, Chen Shi, Rumao Tao, Xiaolin Wang, and Xiaojun Xu, "4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings," Chin. Opt. Lett. 16(03), 031407(2018)

Note: The authors thank Mr. Xiaoyong Xu, Mr. Kun Zhang, Mr. Lin Chen, and Miss Siliu Liu for the help with the construction of the laser oscillator and measurement of the laser performance in the experiment. Also, we thank Professor Pu Zhou for the helpful suggestions and refinement on the manuscript. The work was supported by the National Key R&D Program of China (No. 2016YFB0402204) and the National Natural Science Foundation of China (Nos. 61735007, 61377062, and 61505260).



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