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利用速率方程对掺Yb3+双包层光纤激光器的自脉冲行为进行了系统的理论研究,给出了光子数密度扰动时变关系式。数值模拟了光子数密度随时间及泵浦功率的变化;阻尼系数与后腔镜的反射率和掺杂粒子浓度的关系;以及光纤本身固有振荡频率随后腔镜反射率的变化。结果发现,增加输出端的反馈和粒子的浓度可以抑制自脉冲现象。当后腔镜的反射率大于0.7时,可以抑制光纤本身固有的振荡,并提出抑制光纤激光器自脉冲的措施。为设计掺Yb3+双包层光纤激光器提供了理论依据。
The velocity equations are used to systematically study the self-pulse behavior of Yb3 + -doped double-clad fiber lasers. The perturbation time-varying relationship of photon density is given. The relationship between the photon number density and the pump power was numerically simulated. The relationship between the damping coefficient and the reflectance of the back cavity mirror and the concentration of doped particles was also numerically simulated. The results showed that increasing the output of the feedback and the concentration of particles can inhibit self-pulse phenomenon. When the reflectivity of the back endoscope is greater than 0.7, it is possible to suppress the inherent oscillation of the optical fiber itself and propose a measure to suppress the self-pulsing of the fiber laser. It provides a theoretical basis for the design of Yb3 + double clad fiber laser.