萘酞菁铅化合物的光限幅特性研究

Optical Limiting Properties of Naphthalocyanine Lead

应用调Q倍频ns/ psNd∶YAG脉冲激光 ,在波长为 5 32nm ,脉冲宽度为 8ns ,重复频率为 1Hz的条件下 ,研究了溶于二甲基亚砜 (DMSO)中的萘酞菁铅溶液的反饱和吸收和光限幅特性。实验表明 ,萘酞菁铅具有良好的光限幅特性 ,它的有效激发态吸收截面与基态吸收截面的比值约为 15 .2 1,大于萘酞菁铜。研究结果表明 ,萘酞菁铅的光限幅特性优于C60 ,激发态吸收是其主要的光限幅机理。实验结果证实了重原子效应可以通过增强系际跃迁而使三重态的反饱和吸收增强 。

The reverse saturable absorption and optical limiting properties in naphthalocyanine lead, dissolved in dimethyl sulphoxide are studied by using a Q \|switched,double frequency ns/ps Nd∶YAG pulse laser system at 532 nm with pulse width of 8 ns,repetition rate of 1 Hz. The experimental results show that the naphthalocyanine lead owns good optical limiting performance, and the ratio of effective excited state absorption cross section to ground state absorption cross section of naphthalocyanine lead is approximately to 15.21, which is larger than that of naphthalocyanine copper. The experimental results show that the optical limiting behavior is better than C 60 , and the excited\|state absorption is the main cause of optical limiting. The experimental results approve that the heavy\|atom effect increases the reverse saturable absorption which improve the power of optical limiting because they enhance the intersystem crossing rates.