Wavelength-Tuning of Nanosecond Pulses in Er-Doped Fluoride Fibre Amplifier

We investigate the gain bandwidth and wavelength-tuning range of an erbium-doped fluoride fibre amplifier. The presented experimental setup consisted a widely wavelength-tunable optical parametric oscillator (OPO), which was amplified in single-stage Er-doped OPO laser provided seed pulses with pulse width 5.2 ns repetition rate 10 kHz. section 2.2 m double-clad, single-mode doping concentration 7 mol%. Wavelength-tuning analysed at values up to 26 dB energies 37.4 $\mu \mathrm{J}$ . Using this setup, we demonstrate continuous wavelength tuning more than 100 nm, covering from 2712 nm 2818 nm.