Modeling of 1.7 m and 2.4 m Dual-Wavelength Pumped 4.3 m Dysprosium-Doped Chalcogenide Fiber Lasers

A novel 1.7 mu m and 2.4 mu m dual-wavelength pumping scheme for a 4.3 mu m dysprosium (Dy3+)-doped chalcogenide fiber laser was theoretically demonstrated. It was attributed to the 2.4 mu m excited stated absorption (ESA, H-6(13/2 -> )6 H(9/2 , )(6)F(11/2 )transition). Theoretically, when the two pumps were 5 W and 2 W, respectively, a laser power of 1.5 W with an remarkable efficiency of 30.2% was obtained from the home-made Dy3+:Ga0.8As34.2Sb5S60 glass fiber with a loss coefficient of 3 dB/m and a Dy3+ concentration of 3.67 x 10(25) ions/m3. Results indicated that the dual-wavelength pumping scheme based on the gain fiber provides a potential way to 4.3 mu m dysprosium-doped chalcogenide fiber lasers.