Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system
Ji En-Cai†, Liu Qiang, Hu Zhen-Yue, Gong Ma-Li
       
Distributions of single-pass gain G ( λ , L ) in cladding-pumped TDFL when L = 1.9 m. (a) G ( λ , L ) under six different pump powers: P in = 0.1 W, 0.5 W, 2 W, 3 W, 5 W, and 34 W; (b) G ( λ , L ) with eight different reflectivities of output mirror: R oc ( λ s) = 0.01, 0.05, 0.10, 0.20, 0.40, 0.60, 0.80, 0.95.