中文摘要：

利用对-硝基苯基重氮氯硼酸盐和聚酰胺酸进行重氮偶合反应，再经过酰亚胺化反应，合成了侧链含偶氮苯发色团的聚酰亚胺非线性光学材料（NLOPI）。在室温下测试了NLOPI的光致变色性能，研究了激光作用时间和激光功率密度对光致变色性能的影响。研究发现，在波长为532nm的YAG激光作用下，随着激光辐射时间的延长和激光功率密度的增大，NLOPI在360nm处的吸收增强。而在500nm处的吸收减弱。采用单光束Z-扫描技术，系统地研究了NLOPI三阶非线性光学特性。研究表明，侧链含偶氮苯发色团的聚酰亚胺为自散焦介质，其非线性折射率n2为-1．62×10^-7esu，非线性折射系数γ为-4．04×10^-14m^2／W，非线性吸收系数β为3．98×10^-8m／W，三阶光学非线性极化率x^（3）为3．41×10^-18m^2／W。

英文摘要：

The nonlinear optical polyimide （NLOPI） attached with azobenzene chromophore side-chain is synthesized by diazo coupling reaction of 4-nitrobenzenediazonium tetrafloroborate to poly（amic acid） in 1-methyl-2-pyrrolidone and imidization reaction at 250 ℃ for 2 h. The photoisomerization property of the NLOPI is investigated. The effects of the laser reaction time and laser power on the photoisomerization property of NLOPI film are studied. When the NLOPI film is irradiated by the 532 nm YAG laser, the absorption peak of NLOPI at 500 nm decreases with rising the laser power and extending laser reaction time, while the absorption at 360 nm increases steadily. The third-order nonlinear optical property of the nonlinear optical polyimide attached with azobenzene chromophore sidechain was studied by Z-scan technology. On the effect of 532 nm laser, the nonlinear refractive index and nonlinear absorption properties of the NLOPI are all negative, which shows that the NLOPI is self-scattering media. The nonlinear refractive index （n2）, nonlinear refractive coefficient （7）, nonlinear absorption coefficient （fi） and the thirdorder nonlinear susceptibility （x^（3） of the NLOPI are -1.62×10^-7 esu, -4.04× 10^-14 m^2/W, 3.98× 10 ^-8 m/W and 3.41 × 10^-18 m^2/W, respectively.