fiber is pumped in-band using an erbium-doped fiber laser at 2.83 μm made in-house and connected through a fusion splice. Two fiber Bragg gratings directly written in the Dy-doped fiber form the 3.24 μm laser cavity to provide a spectrally controlled laser output. This substantial increase of output power in the 3.0-3.3 μm spectral range could open new possibilities for applications in spectroscopy and advanced manufacturing.
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Fortin et al. (2019) studied this question.
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