Three-component bright-dark–bright vector pulse fiber laser based on MoS 2 saturable absorber
Using the saturated absorption and the high nonlinearity of the molybdenum disulfide (MoS2) saturable absorber (SA), a three-component bright-dark-bright bright–dark–bright (BDB) vector pulse fiber laser is reported. By using polarization resolved measurement and spectral filtering, it can be found that the dark pulse component and one of bright pulses components constitute the dark-bright dark–bright pulse pair with the same polarization state. The dark-bright dark–bright pair and another bright pulse are orthogonally polarized. In other words, the single BDB pulse can be also considered to be composed of the orthogonal a bright pulse and a dark-bright dark–bright pulse pair. The time interval between the bright pulse and the dark-bright dark–bright pulse pair remained unchanged as the pump power was increased. The experimental results clearly show the existence of a new BDB vector pulse in fiber laser.
