Thiophene-fluorene derivatives with high three-photon absorption activities and their application to optical power limiting
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
a Department of Optical Storage, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Laboratory of Functional Materials, Heilongjiang University, Haerbin 150080, China; c Department of Physics, Henan University, Kaifeng 475001, China
Abstract 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.
Received: 18 August 2005
Revised: 12 January 2006
Accepted manuscript online:
PACS:
42.50.Hz
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60207005) and the Shanghai Science & Technology Development Foundation (Grant No 012261068).
Cite this article:
Ma Wen-Bo (马文波), Wu Yi-Qun (吴谊群), Han Jun-He (韩俊鹤), Liu Jun-Hui (刘军辉), Gu Dong-Hong (顾冬红), Gan Fu-Xi (干福熹) Thiophene-fluorene derivatives with high three-photon absorption activities and their application to optical power limiting 2006 Chinese Physics 15 750
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