Abstract
We report two new near-infrared pump wavelengths at 0.8
$\mu$
m and 0.9
$\mu$
m for dysprosium (Dy
$^{3+}$
)-doped mid-infrared fiber lasers, which are free from detrimental pump excited state absorption that has limited all previous Dy
$^{3+}$
fiber lasers using longer near-infrared pump wavelengths (i.e., 1.1
$\mu$
m, 1.3
$\mu$
m, and 1.7
$\mu$
m). The maximum measured laser slope efficiencies were 18.5% and 23.7% with respect to launched pump power for 0.8
$\mu$
m and 0.9
$\mu$
m pump wavelengths, respectively. These new pump wavelengths provide higher fractional Stokes limits (which are 70% and 79% for 0.8
$\mu$
m and 0.9
$\mu$
m pumping wavelengths, respectively) than previous demonstrations. While our measured efficiencies are still below the Stokes limit, we have identified the causes to be background loss and multi-mode behaviour at the pump wavelengths; both easily solvable for future systems. A numerical model was used to confirm performance, paving the way to efficient future near-infrared-pumped, potentially diode-pumped Dy
$^{3+}$
fiber lasers emitting in the mid-infrared.
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