Abstract
On-demand soliton molecule (SM) generation is an advanced coherent multipulse technique in the field of nonlinear optics. Experimentally generating controllable SMs is a significant challenge. Here, we propose to manipulate the generation of tunable SMs in a mode-locked fiber laser based on the self-constructed cascaded compound filtering effect. The cascaded compound filter is achieved by incorporating nonlinear polarization rotation (NPR) filtering into two-stage Lyot filtering for performing a multiplication operation between these two filtering functions. Tunable SMs with flexible parameters of the internal soliton spacings from 4.64 to 6.47 ps, pulse numbers from 2 to 26 and some special phases of ∼ π and ∼ 0.5π are experimentally created on demand by adjusting the cascaded compound filtering profiles. The simulation of SM generation in a fiber laser is carried out to reproduce the transient processes of experimental observations, which reveals that cascaded compound filtering is beneficial for manipulating the generation of SMs. Our research provides a good platform for studying coherent multipulse generation in a dissipative nonlinear system and a novel method for manipulating tunable SM generation.
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