The influence of the concentration of bismuth active centres (BACs) in phosphosilicate fibres on their optical parameters, including gain coefficient and non-saturable losses, has been studied. A range of BAC concentrations optimal for designing ultrashort-pulse (USP) lasers was chosen based on the obtained results. The optimised fibre was used to fabricate an all-fibre USP laser mode-locked by a nonlinear loop mirror, which emits pulses with an energy of and a repetition rate of . A bismuth fibre amplifier made it possible to increase the pulse energy to . After compression in a diffraction grating compressor, the pulse duration decreased to .
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Khegai et al. (2016) studied this question.
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