Impact of spectral filtering on a weak breathing laser based on AS-Yb-PBGF with large net normal dispersion cavity

Abstract

We have investigated numerically the effects of the spectral filtering on the temporal and spectral properties of the pulse with large net normal cavity dispersion in a weak breathing passively mode-locked ring laser based on all-solid Yb-doped photonic bandgap fiber (AS-Yb-PBGF), which gives the laser gain and anomalous dispersion simultaneously. The specific range of spectral filter bandwidth is indispensable for obtaining high-peak-power pulse in a given highly chirped pulse laser system under a fixed pump level. The shortening of the pulse durations and the shaving of the sharp peaks at the steep edges of the spectrum by the spectral filter are demonstrated. Moreover, the advantage of the weak breathing fiber laser by introducing the AS-Yb-PBGF for scaling up the peak power and shortening the pulse width is investigated, and the effect of third-order dispersion induced by AS-Yb-PBGF on the pulse shape is also discussed.