Dr. Linpeng Yu Profile

Dr. Linpeng Yu

at Shenzhen Univ

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Proceedings Article | 18 March 2024 Paper

Mid-infrared conventional solitons and soliton molecules in a polarization-maintaining fluoride fiber oscillator

Qinghui Zeng, Linpeng Yu, Peiguang Yan, Jinzhang Wang, Qitao Lue, Chunyu Guo, Shuangchen Ruan

Proceedings Volume 13104, 131041L (2024) https://doi.org/10.1117/12.3022576

KEYWORDS: Solitons, Mode locking, Molecules, Oscillators, Fluoride, Fiber lasers, Mid infrared, Polarization

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Mid-infrared conventional solitons and soliton molecules are generated in a polarization-maintaining erbium-doped fluoride fiber oscillator, where a semiconductor saturable absorber is used as the mode locker and a polarization beam splitter is employed for getting linearly polarized output pulses. By rotating the half-wave plate in front of the polarization beam splitter to change the output coupling ratio, the system is switchable between conventional solitons and soliton molecules. conventional solitons with a pulse duration of 120 ps, a maximum average power of 248 mW, and a repetition rate of 44.5 MHz are obtained when the oscillator operates in the single-pulse mode-locked state. By decreasing the output coupling ratio, the operating regime of the oscillator switches to the soliton-molecule mode-locked state, in which soliton-triplets equally distributed at a repetition rate of 44.5 MHz with a signal-to-noise ratio of 78 dB and a temporal separation of 60 ps are obtained. Our work offers a scheme to realize switchable operations between the conventional soliton and the soliton molecule in the mid-infrared polarization-maintaining mode-locked fiber laser.

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