共轭有机高聚物PPQ薄膜的双光子吸收

Two Photon Absorption in PPQ Conjugated Polymer Film

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.