Cavity-birefringence-dependent vector pure-quartic soliton fiber laser

Pure-quar tic soliton (PQS) fiber lasers provide a promising avenue for exploring novel soliton interaction dynamics and generating high-energy pulses. Here, we present the numerical observation of vector PQSs generation and the evolution dynamics in a mode-locked fiber laser, using the coupled Ginzburg-Landau equations. We investigate the buildup dynamics of vector PQSs in a mode-locked laser with birefringent fibers, passing through three stages: energy amplification, energy pulsation owing to the cross-phase modulation (XPM) effect, and finally stabilization. Depending on the strength of the cavity-birefringence, the evolution of PQSs in non-polarization-maintaining fibers reveals that both the elliptical-polarization vector PQSs and near-linear-polarization vector PQSs can be formed by the energy conservation and balance between the two orthogonal directions. Additionally, we observe the transition process from vector PQSs to scalar PQSs with higher cavity-birefringence, resulting from the failure compensation of the walk-off via the soliton trapping effect between the two orthogonal components. These results provide valuable insights into the ultrafast transient process of vector solitons and enhance the understanding of PQS generation in fiber lasers.

Automated summary

This paper presents the numerical observation of vector Pure-quar tic solitons (PQSs) generation and evolution dynamics in a mode-locked fiber laser. The study reveals three stages of the buildup dynamics of vector PQSs: energy amplification, energy pulsation due to cross-phase modulation (XPM) effect, and stabilization. Depending on the strength of cavity-birefringence, both elliptical-polarization and near-linear-polarization vector PQSs can be formed. Furthermore, the transition process from vector PQSs to scalar PQSs is observed with higher cavity-birefringence.