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利用对硝基苯基重氮氟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的光敛变色性能,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532 nm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500 nm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n_2为-1.62×10~(-7)esu,非线性折射系数γ为-4.04×10~(14)m~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χ~(3)为3.41×10~(-18)m~2/W。
The diazonium coupling reaction of p-nitrophenyldiazofluoroborate and polyamic acid was carried out, and then the polyimide nonlinear optical material containing side-chain azobenzene chromophore was synthesized through imidization reaction (NLOPI). The photochromic properties of NLOPI were tested at room temperature. The effects of laser action time and laser power density on the photochromic properties were studied. The results show that with the increase of laser irradiation time and laser power density, the absorption of NLOPI at 360 nm increases and the absorption at 500 nm decreases with YAG laser wavelength of 532 nm. The single-beam Z-scan technique is used to systematically study the third-order NLOPI nonlinear optical properties. The results show that the side chain azobenzene chromophore polyimide as a self-defocusing medium, the nonlinear refractive index n_2 -1.62 × 10 ~ (-7) esu, the nonlinear refractive index γ -4.04 × 10 ~ (14) m ~ 2 / W. The nonlinear absorption coefficient β is 3.98 × 10 ~ 8m / W and the third order nonlinear optical susceptibility χ ~ (3) is 3.41 × 10 ~ (-18) m ~ 2 / W.