Abstract
Observations are presented on the self-pulsing behaviour of the Tm 3+-doped silica fibre laser operating near 2 μm. Various self-pulsing regimes are observed for a range of pumping rates when the fibre is end-pumped with a high power Nd:YAG laser operating at 1.319 μm in a linear bidirectional cavity. A rich variety of nonlinear phenomena, ranging from self-pulsing to self-Q-switching and to a modulated quasi-CW wave, are observed. The phenomenon of pair-induced quenching (PIQ) is considered, compatible with excited-state absorption (ESA). The influence of thulium concentration on ion-pair production is described. The model developed based on the rate equations for a three-level system describes the experimental observations.
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