3-羟基黄酮的双光子吸收特性研究

Two-proton Absorption Study of 3-hydroxyflavor

3-羟基黄酮(3-HF)是一类具有激发态质子转移(ESPT)效应的有机分子,通过双光子诱导荧光研究了3-HF的ESPT的过程,并利用开孔Z-扫描的方法,在波长为532 nm的皮秒脉冲激光激发下测量3-HF在环己烷溶液中的ESPT的双光子吸收系数。实验测得了在不同光强条件下的双光子吸收系数,结果表明,3-HF的双光子吸收系数随入射光强的增加而减小。这是由于在皮秒脉冲光的作用下,大量的3-HF分子被激发到激发态,而不能迅速返回,造成基态的粒子数不断减小,因此当光强增强时,双光子吸收系数减小。

3-hydroxyflavor （3-HF） is an organic molecule with excited-stated proton transfer （ESPT） effect. The ESPT process of 3-HF was investigated by using two photon fluorescence technique. Using open aperture Z-scan technique,we measured two photon absorption coefficient of 3-HF which was excited by the picosecond pulse laser at 532 nm,and obtained the two photon absorption coefficients of 3-HF under different light power, the resutls have showed that two photon absorption coefficient of 3-HF decreases as the light power increases. Excited by the picosecond pulse laser,many molecules of 3-HF is excited to the excited state and can not be back immediately to the ground state,the amount of 3-HF molecules in the ground state are decreased,so the two photon absorption coefficient of 3-HF will be decreased when the light power increases.