制备了一种新型大π共轭高分子聚吡咯 { 2 ,5 二 [(对硝基 )苯甲烯 ]} (PPNB)的纳米薄膜 ,采用激光纵向扫描法研究了其三阶非线性光学性质 .测量了其非线性折射率和三阶非线性极化率 .研究发现该聚合物具有大的三阶非线性光学响应 ,其非线性折射率 (esu)为 1 4 7× 10 - 5,三阶非线性极化率 (esu)为 1 4 4× 10 - 8.从UV vis NIR吸收光谱可知 ,在波长为 532nm的激光照射下 ,PPNB的非线性吸收是双光子吸收 .对比PPNB的纳米薄膜和溶液的三阶非线性极化率和非线性折射率 ,发现纳米薄膜的三阶非线性极化率比溶液的高 2至 3倍 ,而非线性折射率则很接近 ,表明纳米薄膜的双光子非线性吸收比溶液强烈 A new kind of nano-film with large π conjugated macromolecular polypyrrole {2, 5 bis [(p-nitrophenyl) ene]} (PPNB) was prepared and its third-order nonlinear optical properties The nonlinear refractive index and the third - order nonlinear polarizability were measured. The results show that the polymer has a large third - order nonlinear optical response with a nonlinear refractive index (esu) of 147 × 10 - 5, The order nonlinear polarizability (esu) is 144 × 10 - 8. From the UV vis NIR absorption spectra, we can see that the non-linear absorption of PPNB is two-photon absorption under the laser irradiation of 532 nm wavelength. And the third-order nonlinear polarizability and nonlinear refractive index of the solution, it was found that the third-order nonlinear polarizability of the nanofilm is 2 to 3 times higher than that of the solution, while the nonlinear refractive index is very close, indicating that the nanostructured bis Photon nonlinear absorption is stronger than solution