Abstract
In this paper, we report the experimental observation of multiple soliton molecule forms and modulation results in an all-polarization-maintaining (PM) linear fiber laser mode-locked by nonlinear polarization evolution (NPE). The relationship between the waveplate angle and the reflectivity profile of the structure is analyzed numerically. Experimentally, it was found that the soliton number inside the bound states decreases from 4 solitons to 1 soliton by reducing the pump power. The soliton separation and the spectral shape could be evolved by slightly rotating the angle of the half-wave plate or λ/8-wave plate respectively. In addition to the above soliton molecules with regular triangular autocorrelation envelopes, (2+1)-type and (1+2+1)-type compound bound states are also obtained, and the fine temporal structure inside these soliton complexes are obtained by numerical simulation. The investigated results enrich the nonlinear dynamics of femtosecond mode-locked fiber lasers and lay the foundation for the application of all-PM fiber lasers mode-locked by NPE.
Published Version
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