Since The Q-mechanism Based On Stimulated Brillouin Scattering Process And Numerical Simulation

In this dissertation, the principle of self-Q-switching fiber laser, common kinds of Er-doped fiber laser and Q-switching technology have been introduced and analyzed. The emphasis of the dissertation was self-Q-switching Er-doped fiber laser based on Stimulated-Brillioun-scattering(SBS),in which the theoretical analyze and the emulating experiment were studied in detail. The physical model of the self-Q-switching process has been presented in this dissertation.It was in this self-Q-switching project that a common single mode fiber was connected to Er-doped fiber in the fiber laser, in which the SBS process of single mode fiber was used to make the Q modulation. By analyzing loss of the cavity ahead and behead SBS, the physical process of self-Q-switching was set up.It has been presented in this dissertation that using model of Q modulated Er-glass laser, through replacing typical number of Er-doped fiber and single mode fiber into the model, then the theoretical model of self-Q-switching by SBS was established. By emulating experiment, the peak value of output power, repeating frequency, width of pulse have been calculated. The data was calculated repeatedly when the length of Er-doped fiber changing. Theoretical result indicated that the self-Q-switching in Er-doped fiber laser based on SBS process was feasible in mathematics, and the conclusion has been presented that the dynamic characteristics of output pulse by SBS are effected tinily by the length of Er-doped fiber in the system.This article will be helpful in theoretical analysis, in which the action of single mode fiber in the self-Q-switching process has been discussed, generally the influence of length of single mode fiber, which also is difficulty to the self-Q-switching system.