ps/ns脉冲序列作用下热致光学非线性的动力学理论研究

Theoretical research of thermal nonlinearity dynamics under ps/ns pulse

研究在19 ps/7 ns 脉冲序列作用下 C_(60)甲苯溶液的 Z-扫描理论曲线。在7 ns 脉冲激发下,单重态第一激发态向三重态基态的跃迁导致下一个脉冲作用时,三重态的吸收和折射也起作用,脉冲间的慢速热弛豫引起的热积累效应也被考虑进去,开孔 Z-扫描理论曲线呈现强烈的反饱和吸收,闭孔/开孔 Z-扫描理论曲线表现为先峰后谷.

We theoretically analyze the difference between the C_(60) in toluene being irradiated by ps/ns pulse and single ps pulse and suggest the contrary Z-scan curves of them.The accumulated thermal effect which is induced by the slow-relaxation heat is supposed to change the value of the nonlinear refraction.