Spectral Dynamics of Actively Q-Switched Erbium-Doped Fiber Lasers

Numerical investigation into the impact of Q-switch rise time on the output pulse characteristics in an actively Q-switched ytterbium-doped fiber laser

“…Figure 5 shows that the peak power fluctuation as a function of the Q-switch rise time can be understood as the Q-switchrise-time-dependent change of multipeak positions. Note that the pulse energy was initially maintained despite the increase of the Q-switch rise time, as mentioned in [35]; however, figure 6(b) shows that in the case of a Q-switch rise time five times longer than the round-trip time (τ round ), it tended to decrease in inverse proportion to the Q-switch rise time. The breaking point of pulse energy is found to be located at time range of (0.37-2.67) τ rise , which appears to be too short to infer that the change of Q-switch rise time has no impact on the energy extraction process [39].…”

“…In particular, Wang et al found that the multipeak phenomenon is caused by the fast rise time of a Q-switch. Various pulse-forming dynamics of Q-switched fiber lasers have also been investigated [33][34][35][36]. Even if those theoretical investigation results have provided useful information for better understanding of the underpinning physical mechanisms of the Qswitched pulse formation within a fiberized cavity, there still remain the technical demands for a more detailed guide to a better design of efficient Q-switched fiber lasers.…”

Noise fiber lasers

“…Note that in this type of lasers Q-switched pulse consists of a train of subpulses, with the number of developed sub-pulses and their powers depending on the EDF initial charge (viz. the multiplication of the density of excited Er 3+ ions in the core with the laser level energy) and cavity loss [14][15][16]. Here, the width of the output 1 cm FBG was 80 pm.…”