We have built a low repetition frequency ytterbium-doped mode-locked fibre laser by combining the nonlinear polarization rotational effect with a long single-mode fibre and achieved a low repetition frequency mode-locked pulse output with a pulse repetition frequency of 268.8 kHz, which is experimentally proved to be highly stable and can be used as an ideal seed source for fibre amplifiers, which is a compact laser that can be used for many important applications.
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Song et al. (2024) studied this question.
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