飞秒激光作用下不同热处理状态Tb_(0.27)Dy_(0.73)Fe_2薄膜的瞬时反射率  

Instantaneous Reflectivity of Tb_(0.27)Dy_(0.73)Fe_2 Films Excited by Femtosecond Laser at Different States

作　　者：黄吉元[1] 周明[1] 刘长隆[1] 王辉[1] 金卫凤[1] 任乃飞[1] 蔡兰[1] 

机构地区：[1]江苏大学光子制造科学技术中心,江苏镇江212013

出　　处：《机械工程材料》2009年第5期93-96,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50575100)

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Tb0.27Dy0.73Fe2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ΔR/R曲线分四个阶段,在最初的200.1 fs内其反射率从之前的稳定值上升到极大值,随后经过200.1 fs,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ΔR/R曲线只有三个阶段,在零点时刻就开始下降,并在200.1 fs之后达到稳定状态;随着泵浦光功率的增大,薄膜ΔR/R曲线的极值呈线性增加。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.

关 键 词：瞬时反射率 泵浦-探测 Tb0.27Dy0.73Fe2薄膜 

分 类 号：O484[理学—固体物理]