Abstract
A confined-doped graded-index fiber model was established with reference to Nufern’s 42C ytterbium-doped fiber. The core NA of the fiber is ${\sim}{0.06}$; the doping/core/cladding diameter is 30/42/250 µm; and the gain ion doping distribution is double parabolic. Based on a forward tandem-pumped amplifier structure, the numerical simulation was carried out on the physics characters of the fiber model. The fourth-order Runge–Kutta method was used to solve the boundary value problem during the numerical simulation. The differences between the graded-index fiber (GIF) and the step-index fiber (SIF) were studied theoretically, and the results illuminated that the beam quality of the GIF was better than the SIF. The stimulated Raman scattering (SRS) power in the GIF was lower than that in the SIF. These results show that the GIF has great potential for increasing the laser output power while maintaining good beam quality and can provide theoretical guidance and reference to experimental research of the high-power fiber laser.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Hanshuo Wu, Ruixian Li, Hu Xiao, Liangjin Huang, Huan Yang, Zhiyong Pan, Jinyong Leng, and Pu Zhou
Opt. Express 29(20) 31337-31347 (2021)
Chongwei Wang, Hu Xiao, Xiaoming Xi, Wei Liu, Ruixian Li, Zhiyong Pan, Huan Yang, Zhiping Yan, Zilun Chen, Liangjin Huang, Meng Wang, Baolai Yang, Xiaolin Wang, Pengfei Ma, and Zefeng Wang
Opt. Express 31(24) 40980-40990 (2023)
Nathan B. Terry, Thomas G. Alley, and Timothy H. Russell
Opt. Express 15(26) 17509-17519 (2007)