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

A novel
$1.7 \mu \text{m}$
and
$2.4 \mu \text{m}$
dual-wavelength pumping scheme for a
$4.3 \mu \text{m}$
dysprosium (Dy3+)-doped chalcogenide fiber laser was theoretically demonstrated. It was attributed to the
$2.4 \mu \text{m}$
excited stated absorption (ESA,
$^{6}\text{H}_{\mathrm {13/2}} \to ^{6}\text{H}_{\mathrm {9/2}},^{6}\text{F}_{\mathrm {11/2}}$
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
$3.67\times 10^{25}$
ions/m3. Results indicated that the dual-wavelength pumping scheme based on the gain fiber provides a potential way to
$4.3 \mu \text{m}$
dysprosium-doped chalcogenide fiber lasers.