Synchronized multi-wavelength soliton fiber laser via intracavity group delay modulation

Dong Mao, Huaqiang Wang, Heze Zhang, Chao Zeng, Yueqing Du, Zhiwen He, Zhipei Sun () and Jianlin Zhao ()
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Dong Mao: Northwestern Polytechnical University
Huaqiang Wang: Northwestern Polytechnical University
Heze Zhang: Northwestern Polytechnical University
Chao Zeng: Northwestern Polytechnical University
Yueqing Du: Northwestern Polytechnical University
Zhiwen He: Northwestern Polytechnical University
Zhipei Sun: Aalto University
Jianlin Zhao: Northwestern Polytechnical University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Locking of longitudinal modes in laser cavities is the common path to generate ultrashort pulses. In traditional multi-wavelength mode-locked lasers, the group velocities rely on lasing wavelengths due to the chromatic dispersion, yielding multiple trains of independently evolved pulses. Here, we show that mode-locked solitons at different wavelengths can be synchronized inside the cavity by engineering the intracavity group delay with a programmable pulse shaper. Frequency-resolved measurements fully retrieve the fine temporal structure of pulses, validating the direct generation of synchronized ultrafast lasers from two to five wavelengths with sub-pulse repetition-rate up to ~1.26 THz. Simulation results well reproduce and interpret the key experimental phenomena, and indicate that the saturable absorption effect automatically synchronize multi-wavelength solitons in despite of the small residual group delay difference. These results demonstrate an effective approach to create synchronized complex-structure solitons, and offer an effective platform to study the evolution dynamics of nonlinear wavepackets.

Date: 2021
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DOI: 10.1038/s41467-021-26872-x

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