Miller A, Karipides A G, Peltz T M
Appl Opt. 1971 Aug 1;10(8):1925-33. doi: 10.1364/AO.10.001925.
The notion is analyzed of obtaining materials with large electrooptic coefficients relative to their dielectric constants by incorporating appropriate optical transitions near the operating wavelengths. It is shown that in such cases the absorption coefficient becomes an important practical parameter of the material. Enhancement of the electrooptic effect in the vicinity of an optical transition was indeed observed in the compound Na(3)Li(CrO(4))(2)-6H(2)O. The electrooptic coefficient n(o)(3)r(22) was found to be 9.7 x 10(-8) cm/statV at nu = 1.67 x 10(4) cm(-1) and 12.2 x 10(-8) cm/statV at nu = 2.00 x 10(4) cm(-1). The absorption coefficient on the tail of the t(1) ? e transition of the chromate ion was considerably greater than what was initially estimated. This was shown to be due partially to the effects of lattice vibrations and partially to crystal imperfections. The extra absorption can in principle be eliminated, and it is concluded that the approach investigated could lead to electrooptic materials with improved characteristics.
通过在工作波长附近引入适当的光学跃迁来获得相对于其介电常数具有大电光系数的材料这一概念进行了分析。结果表明，在这种情况下，吸收系数成为材料的一个重要实际参数。在化合物Na(3)Li(CrO(4))(2)-6H(2)O中确实观察到了在光学跃迁附近电光效应的增强。发现电光系数n(o)(3)r(22)在ν = 1.67×10(4) cm(-1)时为9.7×10(-8) cm/statV，在ν = 2.00×10(4) cm(-1)时为12.2×10(-8) cm/statV。铬酸根离子t(1)→e跃迁尾部的吸收系数比最初估计的要大得多。结果表明，这部分是由于晶格振动的影响，部分是由于晶体缺陷。原则上可以消除额外的吸收，并得出结论，所研究的方法可能会导致具有改进特性的电光材料。
