共轭有机高聚物PPQ薄膜的双光子吸收  

Two Photon Absorption in PPQ Conjugated Polymer Film

作　　者：刘建华[1] 朱鹤元[1] 胡谊梅[1] 孙迭篪[1] 李富铭[1] 孙猛[2] 

机构地区：[1]复旦大学物理系,三束材料改性国家重点实验室复旦大学分部,上海200433 [2]复旦大学高分子科学系,上海200433

出　　处：《光学学报》2000年第11期1570-1574,共5页Acta Optica Sinica

基　　金：国家自然科学基金!(项目批准号 :1980 4 0 0 3);复旦大学青年基金!( CH12 2 2 2 )资助项目

摘　　要：在 532 nm波长处测量了共轭高聚物 PPQ薄膜的三阶光学非线性参数 ,发现其较强的非线性 (双光子 )吸收系数β≈ 0 . 59cm/ MW。其非线性折射率系数 n2 ≈ 9. 5× 10 -10 esu,认为这是双光子激发的纯电子响应。并对材料的品质因素进行了评估。Measurements on the third order optical nonlinearities of the conjugated polymeric cast film of PPQ (polyphenylquinoxalines) were performed at 532 nm wavelength using a frequency doubled mode locked Nd∶YAG laser with 10 Hz repetition rate. Strong two photon absorption coefficient β=0.59 cm/MW was obtained for PPQ. The measured nonlinear refractive index coefficient n 2≈9.5×10 -10 esu, was in agreement with the previously reported value. It was attributed to a purely electronic response for the optical nonlinearity, and the figure of merit of PPQ was assessed.

关 键 词：共轭高聚物 Z-扫描 PPQ薄膜 双光子吸收 

分 类 号：O484.41[理学—固体物理]