以咔唑为电子供体, 苯并噻唑为电子受体, 合成了两种新型咔唑-苯并噻唑衍生物3-(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑和3,6-二(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑, 通过核磁共振和分光光度计对其结构进行表征.利用刮刀法制备质量分数为4%的衍生物/聚酰亚胺的复合薄膜.采用透射光谱法和单光束Z-扫描技术分别测试了衍生物的线性和三阶非线性光学特性. Z扫描实验结果表明3-(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑薄膜的非线性吸收系数和非线性折射系数分别为β1=－2.118 9×10－10 cm/W、r1=2.285 2×10－14 cm2/W, 具有反饱和吸收特性和自聚焦效应;同时3,6-二(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑薄膜的非线性吸收系数与非线性折射系数分别为β2=－1.275 6×10－9 cm/W、r2=－7.039 9×10－14 cm2/W, 具有反饱和吸收特性和自散焦效应.

Two novel carbazole-benzothiazole derivatives 3-((2-benzothiazole-2-yl) ethenyl)-N-ethyl-carbazole and 3, 6-bis ((2-benzothiazole-2-yl) ethenyl)-N-ethyl-carbazole containing carbazole as a donor and benzothiazole as an acceptor were synthesized and characterized by 1H-NMR spectra and UV-Visible spectrophotometer. The compound-doped polyimide thin film with mass fraction 4% were prepared by doctor blading on the glass substrate. The linear and nonlinear optical properties of the thin film were studied using the transmission spectrum method and Z-scan technique with 30 ps pulses at 1 064 nm, respectively. The values of the nonlinear absorption coefficient and nonlinear refractive index of the two thin films were β1=－2.118 9×10－10 cm/W, r1=2.285 2×10－14 cm2/W, β2=－1.275 6×10－9 cm/W, r2=－7.039 9×10－14 cm2/W, respectively. The Z-scan results revealed that the first compound-doped polyimide thin film exhibited reverse saturable absorption and self-focusing effect while the second compound-doped polyimide thin film exhibited reverse saturable absorption and self-defocusing effect.