中国物理B ›› 2006, Vol. 15 ›› Issue (4): 750-755.doi: 10.1088/1009-1963/15/4/015
顾冬红1, 马文波2, 干福熹2, 吴谊群3, 韩俊鹤4, 刘军辉4
Ma Wen-Bo (马文波)a, Wu Yi-Qun (吴谊群)ab, Han Jun-He (韩俊鹤)c, Liu Jun-Hui (刘军辉)c, Gu Dong-Hong (顾冬红)a, Gan Fu-Xi (干福熹)a
摘要: The three-photon absorption (3PA) properties of two thiophene-fluorene derivatives (abbreviated as MOTFTBr and {ATFTBr}) have been determined by using a Q-switched Nd:YAG laser pumped with 38ps pulses at 1064nm in DMF. The measured 3PA cross-sections are 152\times 10-78cm6s2 and 139\times 10-78cm6s2, respectively. The optimized structures were obtained by AM1 calculations and the results indicate that these two molecules show nonplanar structures, and attaching different donors has different effects on the molecular structure. The charge density distributions during the excitation were also systematically studied by using AM1 method. In addition, an obvious optical power limiting effect induced by 3PA has been demonstrated for both derivatives.
中图分类号: (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)