Abstract
Efficient continuous-wave laser operation at 2.982 $\mu \text{m}$ is achieved with a Dy3+:fluoride fiber pumped using an inhouse-built 1.1 $\mu \text{m}$ ytterbium (III) fiber laser. The laser output power reached is 554 mW, with a maximum slope efficiency of 18% with respect to the launched pump power. Additionally, the measured spontaneous luminescence within the visible wavelength range, under 1.1 $\mu \text{m}$ pumping, is presented and attributed to excited state absorption (ESA). The influence of the ESA on the laser performance is discussed. The results confirm that high output powers from Dy:fluoride fiber laser pumped at 1.1 $\mu \text{m}$ are possible.
Highlights
MID-INFRARED (MIR) fiber sources with emitting wavelengths covering the range stretching from 2.5 μm to 6 μm have many applications in remote sensing, medicine and defence [1,2]
The results show that more than 554 mW of output power at 3 μm and with a slope efficiency of 18% can be achieved by a Dy3+: ZBLAN fiber laser pumped at 1.1 μm
The incident pump power was estimated by coupling the pump to the fiber core at one end of a silica fiber with a similar core diameter and numerical aperture (NA) as the Dy3+: ZBLAN fiber used in the laser, and measuring the power transmitted through the silica fiber at the other end
Summary
MID-INFRARED (MIR) fiber sources with emitting wavelengths covering the range stretching from 2.5 μm to 6 μm have many applications in remote sensing, medicine and defence [1,2]. The highest slope efficiency for CW operation of dysprosium ion doped fluoride fiber lasers has so far reached 51% under resonant pumping by an erbium ion doped fluoride fiber laser operating at 2.8 μm (80 mW maximum output power) [12]. A CW dysprosium fluoride fiber laser pumped at 1.7 μm with a Raman laser was shown in [13] This laser had a slope efficiency 21% and generated about 200 mW of output power. The results show that more than 554 mW of output power at 3 μm and with a slope efficiency of 18% can be achieved by a Dy3+: ZBLAN fiber laser pumped at 1.1 μm.
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