两种三光子吸收染料光限幅性能的实验研究

Experimental Studies on Optical Power Limiting of Two Three-Photon Absorption Dyes

研究了两种新型D-π-D结构的芴类衍生物4-{7-[4-(二甲基胺)苯基]-9,9-二(2-乙基己基)-9H-芴-2-}-N,N-二甲基苯胺[缩写为B(DMAP)F]和4-{2-[7-(4-氨基苯乙烯基)-9,9-二(2-乙基己基)-9H-芴-2-]乙烯基}苯胺(缩写为BASF)在四氢呋喃(THF)和N,N-二甲基甲酰胺(DMF)中的线性吸收和单光子荧光行为,用脉冲宽度为38 ps,重复频率为10 Hz的1064 nm Nd∶YAG脉冲激光研究了两种化合物的三光子吸收性质,结果表明:受溶剂效应的影响,两种化合物在极性较大的四氢呋喃溶剂中的最大线性吸收峰和荧光发射峰都有所红移;在极性较大溶剂中三光子吸收截面的数值较大,最高达到10-76cm6s2数量级。两种新材料还表现出明显的三光子吸收光限幅效应,当入射光强为8 GW/cm2时,B(DMAP)F和BASF的非线性透过率分别达到35%和39%。

The linear absorption, single-photon fluorescence and three-photon absorption properties of two novel fluorene-based derivatives （4-（7-（4-（dimethylamino）phenyl）-9,9-bis（2-ethylhexyl） -9H-fluorenee-2-yl）-N,N-dimethylbenzenamine（abbreviated as B（DMAP） F）and4-（2-（7-（4-aminostyryl）-9,9-his（2-ethylhexyl）-9H-fluoren-2-yl）vinyl）benzenamino（abbreviated as BASF） with D-π-D structural motifs were reported in THF and DMF solvents. The results show that the absorption peaks and emission peaks of two compounds all have red shift induced by solvent effect. It was found that the three-photon absorption cross-section becomes larger in the more polarity solvent and maximal cross-section is in the order of 10^-76cm^6s^2. Large optical power Limiting induced by three-photon absorption has also been demonstrated for both dyes. When the incident irradiance reaches 8 GW/cm^2, the limiting nonlinear transmissions of B（DMAP）F and BASF can reach 35% and 39%, respectively.