中文摘要：

为了提高Tb0．27Dy0.73Fe2薄膜材料的性能，运用飞秒激光泵浦-探测技术研究了泵浦光功率和550℃退火对Tb0.27Dy0．73Fe。薄膜瞬时反射率的影响。结果表明：飞秒激光作用下未退火薄膜的瞬时反射率△R／R曲线分四个阶段，在最初的200．1fs内其反射率从之前的稳定值上升到极大值，随后经过200．1fs，反射率到达极小值后达到稳定状态；而退火后的Tb0.27Dy0．73Fe2薄膜△R／R曲线只有三个阶段，在零点时刻就开始下降，并在200．1fs之后达到稳定状态；随着泵浦光功率的增大，薄膜△R／R曲线的极值呈线性增加。

英文摘要：

The effects of pump power and annealed at 550℃ on the instantaneous reflectivity of Tb0. 27 Dy0. 73 Fe2 films was studied by femtosecond laser pump-probe technology for improving the characteristics of the materials. The results show that the instantaneous reflectivity △R/R curves of unannealed film had four stages, first the reflectivity arrived at the maximum after 200. 1 fs excited by femtosecond laser, and then the system was in equilibrium after 200.1 fs. △R/R curves of annealed film started to decrease at zero, and then arrived equilibrium after 200.1 fs. With the increasing of pump power the change extent of △R/R curve was linear.