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We explore the potential of a new mid-infrared laser transition in praseodymium-doped fluoride fiber for emission around 3.4 μm, which can be conveniently pumped by 0.975 μm diodes via ytterbium sensitizer co-doping. Optimal cavity designs are determined through spectroscopic measurements and numerical modeling, suggesting that practical diode-pumped watt-level mid-infrared fiber sources beyond 3 μm could be achieved.
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R. I. Woodward, D. D. Hudson, S. D. Jackson, "Towards diode-pumped mid-infrared praseodymium-ytterbium-doped fluoride fiber lasers," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120S (26 February 2018); https://doi.org/10.1117/12.2294508