Abstract
The lasing dynamics of fibre lasers with a core based on quartz glass doped with holmium ions to concentrations in the range of 1019-1020 cm-3 is investigated. It is shown that fibre lasers with a high concentration of active holmium ions generate pulses, but a decrease in the holmium concentration changes the lasing from pulsed to cw regime. At the same time, a decrease in the active-ion concentration and the corresponding increase in the fibre length in the cavity reduce the lasing efficiency.
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