高活性、高产率非线性偶氮化合物的合成及其线性、非线性光学性能

合成了一类高产率的基于偶氮的新型非线性活性化合物. 初步测定其薄膜的折射率可在1.55—1.64范围内任意调节, 薄膜的Tg在130 ℃ 以上, 其未经优化的非线性光学系数γ33为16 pm/V(1310 nm), 该材料在通讯波长窗口的光学损耗较小, 化合物的热分解温度在239 ℃ 以上.

Synthesis of Novel and Highlyactive Nonlinear Chromophores in High Yields and Their Linear and Nonlinear Optical Properties

Two kinds of novel second-order nonlinear optical(NLO) active chromophores based on diazo with TCF(tricyanofuran) as the acceptors and 3,4-disubstituted thiophene as the bridges were designed and prepared. Improvements in the nitration and diazo coupling reactions increased the total yields of the chromophores from 7% to 20%. The structures of the products were fully characterized via IR, UV, MS and 1H NMR. A loading study was carried out by doping the chromophore in polycarbonate(PC) with different mass fractions. The polymer films were prepared and the glass transition temperatures(Tg), refractive indices(n), propagation optical loss(OL) and electro-optical coefficient values(γ33) of the films were determined. The γ33 of 16 pm/V was obtained and higher value is expected if poling conditions are further improved. The decomposition temperatures of the chromophores are above 239 ℃, and the optical losses of the films at 1310 nm and 1550 nm is low. These results indicate that the chromophores are very promising candidates for practical applications in the field of electro-optics and photonics.