Q-switched Tm³⁺-doped multi-ring fibre laser operating at 1.96 μm

Abstract

A realisation of a Q-switched Tm³⁺-doped fibre laser operating at 1.96 μm wavelength is reported. The Tm³⁺-doped fibre was fabricated using a novel multi-ring modified chemical vapour deposition-chelate doping technique (MCVD-CDT) technology. The developed laser emits pulses at a repetition rate of 3 kHz with an energy of 84 μJ and a duration of 272 ns, which corresponds to a peak power of 304 W. The experimental results confirm that the fabricated Tm3+-doped multi-ring, large mode area fibre is a promising candidate for developing high-energy Q-switched lasers operating near 2 µm wavelength.