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
       
Output spectra of TDFL under different pump currents: (a) I = 1.8 A; (b) I = 2.8 A; (c) I = 3.6 A; (d) I = 5.6 A.