High efficiency, low threshold amplification and lasing at 0.8 μm in monomode Tm 3+ -doped fluorozirconate fibre

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Abstract
Efficient amplification at around 0.8 μm in a monomode Tm3+-doped fluorozirconate fibre is reported. A gain of 23 dB at 805 nm was achieved for 50 mW of pump power at 780 nm. Low threshold (15 mW), high slope efficiency (>60%) laser oscillation in this wavelength region is also described.